Double ovsynch

3% pregnancies for activity monitors. One of the simplest modifications of the classical Ovsynch system used is so called Co-Synch protocol. the Ovsynch protocol in 6 or 7 days, respectively, tended to improve pregnancy rate. improvements to Ovsynch, have resulted in conception rates of 45% following timed AI (Brusveen et al. Reduced PVD(clinical endometritis) and SCE (subclinical endometritis) Primi= PVD25 p. Second and later AIs A. Cosynch Optimize time of AI DITCH COSYNCH! Presynch-14 vs. . Fixed time artificial insemination. The Double-Ovsynch protocol which submits cows to a ‘presynchronizing Ovsynch’ followed 7 d later by the ‘breeding Ovsynch’. , 2013 Presynch-Ovsynch + Ovsynch 33 25 23 57. Some don’t show signs of heat but do ovulate. 2013 Jan 1;79(1):159-64. 39%, respectively) with similar average standard ovsynch does not have as high a rate of synchronization of cows as previously thought G-6-G protocol and Double Ovsynch have been shown to have a higher rate of synchronization relative to standard ovsynch and Pre-synch alone Presynch-Ovsynch (Moreira et al. e. 75 had a greater probability of becoming pregnant, but pregnancy rates were still Double Ovsynch helps to solve the problem of cows that are not ovulating. 7 days. A difference of 13% was also found when a Presynch program was compared to Ovsynch without presynchronization (50% vs. (i. • Double ov‐synch • GGPG. Limited work had been done in America with positive results and further work in different areas of the dairy industry was needed to continue to validate the study. High fertility at First AI; P/AI > 44% II. 5dCosynch72 GnRH PGF 7 days 72 h GnRH TAI S MT W R F S ST W R F S M T W R F S S M T W R F S PGF GnRH TAI Afternoon GnRH, morning TAI Morning GnRH, A CIDR can be used with any of these programs (CIDR Ovsynch). Although ovulatory responses were similar after the first GnRH administration, Double Ovsynch cows tended to have greater ovulation responses after the second GnRH administration. A timed AI program can start seven days after the last GnRH treatment in either case. Some cows show signs of heat but don’t ovulate. For cows synchronized with a Double Ovsynch protocol for first TAI: • Cows with low (≤2. Research has  Double-Ovsynch. 2. Double Ovsynch helps to solve the problem of cows that are not ovulating. Cows (n = 356) were randomly assigned to synchronization with Ovsynch (OVS), Presynch–Ovsynch (PO) or Double‐Ovsynch (DO) and inseminated on Day 77 ± 3 postpartum with either frozen‐thawed SS (n = 182) or CS (n = 184) of the same bull. At Cloverdale Dairy (5000 cows) I got the opportunity to work with the maternity staff, the breeding staff and the herd health staff. B. Giordano et al. Double-Ovsynch has also been investigated and uses an Ovsynch protocol during the pre-synchronization period instead of two PGF2 injections. 170 Lactation stage has also been shown to affect pregnancy rates following Ovsynch in dairy cows, since cows started on the Ovsynch program 76 days after calving show improved pregnancy rates over those initiating Ovsynch between 60 and 75 days postpartum. I’ll look back at the calendar to double check for you. 10 . Multi = 20 p. “We’ll get about 90 percent of the cows to ovulate, which means 90 percent of the cows start Ovsynch on day 7. 12-day Presynch®. Short time between AIs (< 42 days) B. Of the three protocols used, DO yield the best reproductive performance in heat-stressed, lactating dairy cows. The study found on first-service AI there were 33. On day 8 most cows have a growing dominant follicle that can ovulate after luteolysis. the ovsynch treatments are dependent on the stages of the estrous cycle (16). Herd Management System will make you recommendations on re-application times and doses, according to the selected protocol. This noninferiority study was based on not finding a difference of >7% between first service CR. 56 h. , 2008; Herlihy et al. Recently, a presynchronization program, termed Double-Ovsynch (DO), has been developed and tested [6] . First AI = Double-Ovsynch 2nd+ AIs = Resynch-25+CL check Day 32 +PGF 36% 21‐day PregRate = 32% If No CL (15%) Start New Ovsynch with CIDR 42% Reproductive Goals I. 05). , 2006) First Service TAI GnRH PGF2α α GnRH GnRH TAI 7 d 3 d 7 d 7d 56h 16h While Double Ovsynch is commonly used in confinement herds in the United States, Foremost is the first to use the system in a grazing herd, Poock says. Pre-Synch 14 - Ovsynch 56 . Behavioral and physiological changes around estrus events identified using multiple automated monitoring technologies. In experiment 1, lac-tating Holstein cows were blocked by parity and were randomly assigned to receive (1) Resynch-25 (D25), the Resynch protocol (GnRH-7 d-PGF 2α-56 h-GnRH-16 h- Presynch Ovsynch Double Ovsynch Primiparous Multiparous Effect of treatment on fertility 39 to 45 d after TAI Souza et al. GnRH. Key words: Cow, Ovsynch, CIDR, double-PGF2α, synchronisation The Ovsynch protocol is an effective breeding programme used in lactat- ing dairy cows worldwide. Treatment Day. Body condition score (BCS) was evaluated and a blood sample was collected immediately before the last PGF 2α treatment of the Double-Ovsynch protocol. original Ovsynch protocol 24h after the initial one and found that it led to an increase in luteolysis and synchronization ac-curacy but gained no improvement in P/AI. Diagram of the Presynch-5d Cosynch and Double-Ovsynch programs used for optimizing timed artificial insemination (TAI) in lactating dairy cows with the timely injections of GnRH and PGF 2α. , 2001) Double-Ovsynch (Souza et al. It takes time for researchers to sift describes Ovsynch programs consisting of GnRH injection, followed by prostaglandin F2α (PGF 2α) administration seven days later, followed by a second injection of GnRH approximately 48 to 56 hours later, with FTAI either 24 or 16 hours later. Are you using a Double Ovsynch, tail chalk or activity monitoring system? Some common TAI protocols include Ovsynch or Presynch. 34%. Souza AH(1), Ayres H,  Mar 20, 2019 Producers can go one of two ways: a double Ovsynch program, where GnRH is administered followed by prostaglandin seven days later and a  Theriogenology. The single large, one-time administered 50-mg dose was effective in causing luteolysis in the 7-day program but slightly less effective in the 5-day program. This program essentially uses an Ovsynch-like protocol up front before  Apr 12, 2012 Double Ovsynch - A full prebreeding Ovsynch protocol is applied without A. Six days after GnRH, the breeding Ovsynch is initiated. Moeller et al. 0% (n=1,292) for Fertiline (Figure 3). ” What is the difference between the regular Ovsynch program and the Double Ovsynch program? Instead of waiting 56 hours, we wait 3 days before the second dose of GnRh (this will be the pre-synchronization period and then the regular Ovsynch will occur) began to focus efforts to modify the original Ovsynch protocol to improve fertility to TAI. Souza AH, Ayres H, Ferreira RM, Wiltbank MC. We conclude that time to pregnancy was reduced when cows received TAI at 60 DIM after the Double-Ovsynch protocol or a combination of AIE after 50 DIM and TAI at 72 DIM with the Presynch-Ovsynch protocol than when cows received TAI at 88 DIM after the Double-Ovsynch protocol. —Double Ovsynch A full prebreeding Ovsynch protocol is applied without A. Equine chorionic gonadotropin. (2015) reported that cows receiving two PGF2α treatments during a Double-Ovsynch protocol had increased luteal regression ( 97% v. 2% P = 0. Decreasing the interval between the Double Ovsynch protocol “With a double Ovsynch program, that combines GnRH with prostaglandin, which is used to synchronize cows, you deal with the an-ovular cows by getting them out of that condition,” he said. I. Dirandeh E. To move all cows in the herd to the same breeding cycle, dairy workers insert a controlled internal drug release (CIDR) applicator coated with progesterone into each cow’s system. The Ovsynch protocol described above has many benefits, including the following: One of the major benefits of Ovsynch is that it greatly increases the service rate in a herd of dairy cows. The second injection of GnRH and AI are performed at the same time e. Ovsynch was the first synchronization protocol developed that allowed for a TAI resulting in conception rates similar to that of AI after a detected estrus. Up to 24 14-day Treatment Day Comparison of Protocols COW PROTOCOLS Ovsyn Therefore, when the Presynch-Ovsynch is implemented the interval between the second PGF2α of the Presynch and the start of the Ovsynch should be 10 to 12 d. Hormonal synchronization protocols are used extensively on dairy farms, and the use of 100 percent timed AI on first breeding is becoming mor OPTION 1 - PreSynch (14/14) + OvSynch OPTION 2 - PreSynch (14/14) + CoSynch72 OPTION 3 - PreSynch (14/11) + OvSynch56 Dairy Cow Synchronization Protocols Dr. This can have dramatic effects on the number of cows that display estrous. The protocol involves the following three hormone administrations: a GnRH administration (GnRH-1) on day 0, followed by PGF2α administration on day 7, and another administration of GnRH (GnRH-2) 48 h later (Pursley et al. i. Ovsynch48. 4% (n=1,328) for FACTREL and 41. Reproductive efficiency is dependent upon both service rate and conception rate. • Slightly more efficient than a single injection protocol. , 2008), while use of double Ovsynch has resulted in conception rates >50% in primiparous, but not multiparous cows (Souza et al. (2011) evaluated 3 reproductive programs for lactating dairy cows—AI based on detection of estrus (DE), the double Ovsynch program for first AI followed by resynchronization of nonpregnant cows with Ovsynch starting on day 32 after the previous AI (DO-Res), and the double Ovsynch program for first and subsequent AI (DO-DO). The vet was out tonite helping to pull butt-first dead twins. Cows receiving 2 PGF 2α treatments dur-ing the Ovsynch protocol had a greater incidence of luteal regression than cows receiving 1 PGF 2α treat- While Double Ovsynch is commonly used in confinement herds in the United States, Foremost is the first to use the system in a grazing herd, Poock says. Dairy Cow Synchronization Protocols - 2016 · Dairy Heifer  Double-Ovsynch has also been investigated and uses an Ovsynch protocol during the pre-synchronization period instead of two PGF2 injections. We've had twins 4 out of 5 of the last calvings. It is critical to track how the cows are getting bred to know the success rate of each method, and that’s the story told when viewing conception rate by breeding code. 1016/j. Extending the duration of the voluntary waiting period from 60 to 88 days in cows that received timed artificial insemination after the Double-Ovsynch protocol affected the reproductive performance, herd exit dynamics, and lactation performance of dairy cows. O. This study investigated the fertility of dairy cows during summer season after treatment with a single or double PGF 2α in a progesterone (P4)-based Ovsynch protocol for fixed-time artificial insemination (FTAI). § Ovsynch uses PGF 2α and GnRH to synchronize ovulation in lactating dairy cows. Theriogenology 80, 773 – 783. Unfortunately, the second greatest obstacle, pregnancies per AI, is not enhanced with Ovsynch (Pursley et al. 39%, respectively) with similar average days in milk (77 days) at first AI. Oestradiol. Cows were divided into quartiles by percentage of body weight change (Q1 = least change; Q4 = most change) from calving until third week postpartum. (12 day interval to start of TAI program). You may have to register before you can post: click the register link above to proceed. The major factor limiting optimum reproductive performance on many dairy farms is failure to detect cows in heat in a timely and accurate manner. – called Double-Ovsynch – has been developed recently by University of Wisconsin researchers. GnRHAI. GnRH-PGF-GnRH/ Ovsynch56. standard ovsynch does not have as high a rate of synchronization of cows as previously thought G-6-G protocol and Double Ovsynch have been shown to have a higher rate of synchronization relative to standard ovsynch and Pre-synch alone Double-Ovsynch Double-Ovsynch End VWP TAI End VWP TAI EDAI+ TAI (D32-Resynch) EDAI + TAI (D32-Resynch) Enroll 7 ± 3 Enroll 60 ± 3 d +28 d Stangaferro et al. Wiltbank said one way is to do a Double-Ovsynch followed by a Resynch-25+CL check. While Double Ovsynch is commonly used in confinement herds in the United States, Foremost is the first to use the system in a grazing herd, Poock says. 152. 49%. Presynch-11 or Presynch-12 2 Kansas State University Agricultural Eperiment Station and Cooperative Etension Service This tool generates a daily calendar of activities and can compare costs of up to three protocols. The Double-OvSynch combines the use OvSynch program before the actual OvSynch protocol aimed to have cows inseminated. The second GnRH injection of the prebreeding Ovsynch is administered seven days before initiating the breeding Ovsynch. Deldar H. 6). 0%. Cows in the high progesterone group were put through a double ovsynch protocol and were injected with a higher level of progesterone at each stage, compared to the cows in the low group. , (2012) Ovsynch synchronized about 84% of the cows receiving the protocol in this study. Dairy Heifer Synchronization Protocols - 2016 (Double Ovsynch) B. Multi = PVD11 p. , 2013). Blood Some common TAI protocols include Ovsynch or Presynch. It was concluded that the programme consisted of 14 days interval double dose PGF 2α injections, GnRH applications 48 h following the second PGF 2α injection and timed artificial insemination 16-20 h after the GnRH injection could be an alternative to the Ovsynch programme in timed artificial inseminations. 2). 36) between Double-Ovsynch versus Presynch for all cows at G1 (). FTAI. CO-SYNCH CO-Synch is an alternative to Ovsynch that is used more extensive-ly in beef herds (Geary et al. Neither requires heat detection, although enhanced pregnancy rates can be achieved if estrus detection is also used. New Developments in Ovulation Synchronization Ovsynch To Celebrate 20 Years of Ovsynching First AI = Double-Ovsynch 2nd+ AIs = Resynch-25+CL check Two lutes double ovsynch If this is your first visit, be sure to check out the FAQ by clicking the link above. Dairy Sci. F. 50 ng/mL) at GnRH-1 (12. Normally, the double bonds in linoleic acid are separated by two single bonds, but in CLA, the double bonds are only separated by one single bond. – Effectively pre-synchronizes cows to maximize progesterone during growth of the ovulatory follicle, which decreases the double ovulation rate and subsequent fraternal twinning. High fertility at 2nd+ AIs; P/AI > 36% It is this double benefit of ovsynch that can readily achieve 45% of cows pregnant after one cycle of breeding. ) that already calls for four GnRH and two prostaglandin treatments in just 27 days. 8%. Lactating Holstein cows (N = 193) were assigned to one of two treatment groups: (1) Presynch (N = 93), two injections of PGF(2α) 14 days apart, followed by the Ovsynch-timed AI protocol 12 days later; and (2) Double-Ovsynch (N = 100), one injection of GnRH, PGF(2α) 7 days later, and GnRH 3 days later, followed by the Ovsynch-timed AI protocol 7 days later. following Double-Ovsynch had 10% greater conception rates for first service compared with AI following heat detection (49% vs. Theriogenology 83: 438-443. 100%. 89. Then when you consider that I went from a 13% preg rate to 23%, 29% conception rate to 43%, I'd say the system was more profitable than my previous double ovsync program. see more details were higher in PG group than the Ovsynch group the difference was not statistically important (p>0. Prostaglandin Based Estrus Synchronization Protocols for Cows With Ovarian Disorders It has been recently possible to achieve estrus synchronization and acceptable pregnancy rates in dairy cows with different ovarian disorders detected during the early postpartum period, using various prostaglandin-based protocols in combination with Some common TAI protocols include Ovsynch or Presynch. Pre- Synch - Cosynch 72. Resynchronization Programs with Estrus Detection Ovsynch Plus Activity Another study in Canada looked at a Double Ovsynch breeding program versus two different monitoring technologies on two Canadian dairies milking more than 500 cows each. Figure 1 on the next page shows the experimental design used in New Developments in Ovulation Synchronization - Dr. Research has shown an 8 percent increase in conception to Presynch. Dairy Cow Synchronization Protocols - 2016 . Producers using assigned to a Double Ovsynch protocol (control) or a Double Ovsynch protocol that included a second PGF 2α treatment 24 hours a L er the fi rst (Brusveen et al. Double Ovsynch PGF2α 14d 10-11d 5d 1d 2d PGF2α PGF2α PGF2α GnRH + TAI Presynch-5 day Cosynch Figure 1. p. A total of 2,620 cows from 40 herds were recruited into this study (mean = 65 ±46. portion of a Double-Ovsynch protocol for first TAI dramatically  Although ovulatory responses were similar after the first GnRH administration, Double Ovsynch cows tended to have greater ovulation responses after the  Pre-Synch 12 - Ovsynch 56. DOUBLE-OVSYNCH PRESYNCH-OVSYNCH) n = 837 n = 850 46. (53, 55). 1% Reduced AI by ED = 37. G6G and Double Ovsynchappear to enhance fertility of dairy cows. You may start the procedure by selecting the protocol that you use at your operation, from among available synchronisation applications. This is economically important to the Ovsynch protocol (Geary et al. Interestingly, when you look at the last three injections in these two popular programs, it’s still the original Ovsynch program that finishes them. Ovsynch portion of the synchronization protocol, and blood samples were collected from a subgroup (~85%) of cows in each treatment at the first GnRH injection of the Ovsynch protocol to determine progesterone concentration at the onset of the protocol (Fricke et al. During the past few years, the Ovsynch protocol has been modified to further improve pregnancy per artificial insemination (P/AI). 48h after the treatment with prostaglandins (Small et al. You are being redirected. , 1997a). 50. Double PG injection All cows are injected twice 11-14 days apart. MODIFIED DOUBLE OVSYNCH CALENDAR Sunday Monday Tuesday Wednesday Thursday Friday Saturday AI AM Modified Double Ovsynch GnRH AM Lutalyse AM GnRH AM Double-Ovsynch has also been investigated and uses an Ovsynch protocol during the pre-synchronization period instead of two PGF2 injections. Pre-Synch 14 - Ovsynch 56. Are you using a Double Ovsynch, tail chalk or activity monitoring system? Extending the duration of the voluntary waiting period from 60 to 88 days in cows that received timed artificial insemination after the Double-Ovsynch protocol affected the reproductive performance, herd exit dynamics, and lactation performance of dairy cows. • The incorporation of AI to estrus during a Presynch-Ovsynch protocol decreased the odds of pregnancy by 35%. 0003) of Double-Ovsynch on the percentage of cows with CL detected ultrasonographically at G1 (). Dirandeh and others published Double-Ovsynch, compared to Presynch with or without GnRH, improves fertility in heat-stressed lactating dairy cows Be welcome to the page about Benefit of ovsynch in dairy cattle of Engormix; a source of knowledge on Benefit of ovsynch in dairy cattle. tion treatment with the Double-Ovsynch (DO) protocol, and (2) evaluate whether hCG for presynchronization could be replaced with GnRH. During winter season the single or double PGF 2α administration did not modify PR or cumulative PR. Some A double Ovsynch protocol can be a useful tool in getting this group cycling and prepared for breeding because it creates two corpus luteums (CL) which boost progesterone at the time of the PG shot. 75 or greater. , non-breeding Ovsynch) before the TAI Ovsynch program (Double Ovsynch) resulted in improved pregnancy rate compared with Presynch-12 in primiparous cows, but not in multiparous cows. Rezaei Roodbari A. J Dairy Sci 2012; 95:639-653. Approach 1 • 3 randomized controlled studies including 1,689 cows were used in a meta-analysis. might be due to the double use of Gonadorelin and additional administration of prostaglandin. Combined protocols include Double Ovsynch and Presynch-Ovsynch programs. Are you using a Double Ovsynch, tail chalk or activity monitoring system? Ovsynch protokolü ve uygulanan GnRH dozu. 1% vs 52. 0% vs 30. I was trained in using the Pocket Cow Card to determine which cows needed GnRH or Lutalyse for the Double OvSynch program as well as administrating shots for the vaccination program. Double ov • Ovsynch ‐ Often based on single or no vet exam all cows had superovulation induced using a modified Double-Ovsynch protocol. 2 mm), conception rate was first GnRH of the Ovsynch increased up to 71. The savings on first service shots was enough to pay for my first system by itself. The second experiment used the Ovsynch protocol, without any presynchronization, in a large number of commercial dairy farms to evaluate whether treatment with 2 PGF could improve fertility to the protocol. Pre-Synch 12 - Ovsynch 56 . , 2012 Presynch-Ovsynch + Ovsynch 42 30-17 2 19 Galvao et al. Ovsynch 56 . cows for a study of a Double Ovsynch protocol using FACTREL or Fertiline, a product approved for use in Canada for treatment of cows with cystic ovaries. In heifers, however, timed AI following Ovsynch seems to have no beneficial effects due to an inconsistent follicular wave pattern. , 2008). Several articles detailing the use of a second 1. Fifty-one Holstein cows were used and allocated into 4 groups. Associate Professor. , 2009). All cows >33 days in milk (DIM) were randomly assigned to receive The objectives were to determine whether rates of conception, ovulation, presynchronization, or follicle and CL characteristics were altered after modifying the Double-Ovsynch (DO) protocol to include hCG compared with the DO protocol. Therefore, producers will not be able to inseminate a high proportion of cows at a detected estrus. The DO protocol is shown below, and involves four injections of GnRH and two of prostaglandins. Timed AI Recently, a field study conducted by Fabio Lima, Carlos Risco, Albert De Vries, Jose Santos, and William Thatcher, from the University of Florida, compared reproductive performance of lactating dairy cows in a commercial dairy farm with cows bred by natural service (NS) or timed artificial insemination (TAI). An injection of PGF is first given, This double ovulation is triggered when the cow has low progesterone levels during the selection phase, or when follicles become dominant over others and are chosen to ovulate. Conception rates of these animals will likely be compromised if bred strictly on a timed-A. (2010), however, using data Julio Giordano. Effect of increasing GnRH and PGF2α dose during Double-Ovsynch on ovulatory response, luteal regression, and fertility of lactating dairy cows. Nearly all cows that have active ovaries will come on heat in the 7 days following the second injection. 170 Dairy COMP 305 - Herd Monitoring commands Here are 10 Dairy COMP 305 commands that can be typed on command line to generate a table or graph of the information. In our study, GnRH was replaced with hCG in the beginning of the double Ovsynch. • Both prostaglandin protocols will be more efficient on heifers and dry cows. Included with each command is a brief description of the command content. SYNCHRONIZATION RATES WITH OVSYNCH. 75 around the time of AI versus cows with a BCS of 2. It is this double benefit of ovsynch that can readily achieve 45% of cows pregnant after one cycle of breeding. Ovsynch program in pasture-based, seasonal or split calving herds. , 2000). This review discusses how these three strategies manipulate ovarian development similar to that of heifers and why compelling data indicate these programs should be referred to as “fertility programs. The main advantage of Ovsynch proto-col is OS that can be done in buffaloes at all stages of the cycle [1]. The Ovsynch synchronization programme becomes a standard component in the . l. 6,7,8 The objectives were to determine whether rates of conception, ovulation, presynchronization, or follicle and CL characteristics were altered after modifying the Double-Ovsynch (DO) protocol to include hCG compared with the DO protocol. 001) The objectives of this study were to evaluate the effects of (1) double doses of PGF2α administration or (2) an exogenous progesterone (CIDR) applied concurrently with, or (3) the day after, first GnRH of Ovsynch (GnRH-1), on syn-chronisation and fertility during the Ovsynch protocol. , Double-Ovsynch) or a single GnRH injection Co-Synch. In the illustration, the first Ovsynch begins on a Friday, 17 days before the breeding Ovsynch is initiated on a Monday. Any cow showing estrus after VWP can be inseminated. 8 ⫾ 0. 5, and timed AI d 10 which is basically the Ovsynch twice and breeding off the second Ovsynch. 39%. De otra parte el protocolo Ovsynch no tuvo éxito para sincronizar vacas en anestro postparto. The document has moved here. Milo Wiltbank, University of Wisconsin-Madison. Many types of CLA are produced in the rumen of dairy cows (Bauman and Lock, 2006), but a common CLA produced from biohydrogenation of linoleic acid is cis-9, trans-11 C18:2. A GnRH injection is given to all animals on day 25 and on day 32 they come in with the pregnancy check and a veterinarian evaluates the ovaries for a CL. Thus, presynchronization of cows with Double-Ovsynch increased fertility in primiparous cows compared to a standard Presynch protocol, perhaps due to induction of ovulation in non-cycling cows and improved synchronization of cycling cows. Ka -zemifard M. (2010), however, using data compared to a 100% TAI program with Presynch-Ovsynch and Ovsynch for the first 3 AI services postpartum. These results were similar to those of Wiltbank et al. The second phenomenon that can reduce the efficiency of OvSynch is non-occurrence of luteolysis after PGF 2α injection (15). MODIFIED DOUBLE OVSYNCH CALENDAR Sunday Monday Tuesday Wednesday Thursday Friday Saturday AI AM Modified Double Ovsynch GnRH AM Lutalyse AM GnRH AM B. With the use of double Ovsynch versus just Ovsynch, cows with BCS of less than 2. 40%. ” Keywords: corpus luteum, dairy, follicle, ovsynch, progesterone. “Double-OvSynch" MON TUE WED THU FRI GnRH (AM) PGF (AM) GnRH (AM) GnRH (AM) PGF (AM) GnRH (PM) TAI Calendars are examples of presynchronization-synchronization combinations that are used for insemination. Double Ovsynch Schedule First Ovsynch induces ovulation in anovular cows! High Progesterone during follicle growth. We got to talking about double ovsynch, which we do not do, & how if you give 2 lutes 24 hours apart at the last lute shot, he claims Dr Fricke of UW Madison says you will get 30% less twins. PGF200. Key Words: Double-Ovsynch, GnRH, dairy cow M218 Reproductive performance of lactating dairy cows man-aged with the Short-Resynch or the Day25-Resynch protocol. If a farm is not treating with some kind of GnRH or CIDR before 60 to 70 days in milk, Wiltbank said, about 23 percent of cows will be anovular at that time. The double ovsynch Start studying ANSC 4045 Test Two. GRAPH FSTBF FOR LACT>0 FDAT>-365 BY FDAT LCTGP\B Ovsynch@ Heifer Synchronization Protocols Oral MGA MGA 2PGF2 CIDR@ Treatment Day , 18 days. Double-Ovsynch and G-6-G is that a relatively low proportion of cows will display estrus during the treatments. Effect of increasing GnRH and PGF2_ dose during Double-Ovsynch on ovulatory response all cows had superovulation induced using a modified Double-Ovsynch protocol. J. Controls in both experiments received only We conclude that time to pregnancy was reduced when cows received TAI at 60 DIM after the Double-Ovsynch protocol or a combination of AIE after 50 DIM and TAI at 72 DIM with the Presynch-Ovsynch protocol than when cows received TAI at 88 DIM after the Double-Ovsynch protocol. Research has shown an 8 percent increase in conception compared to Presynch. Masoumi R. ca DOUBLE OVSYNCH DATE NUMÉRO/NUMBER ESTRUMATE cows (n = 541) were submitted to a Double-Ovsynch protocol to receive their first timed artificial insemination (TAI). High ovulation to first GnRH of Breeding Ovsynch. At G1, there was an effect (P = 0. Poor heat detection results in excessive number of days not pregnant (days open) which causes long calving intervals. Ovsynch Protocol at Different Stages of the Estrus Cycle Goshen, T. Ultrasound will be performed on day of AI (d0) and d5 to detect ovulation. Another synchronization protocol recently developed is the G6G Ovsynch. All cows (n = 378) re- Fricke believes both methods are effective at dealing with anovular cows. The first injection is given 16 days before the start of mating and the second injection is given 2 days before mating starts. Apr 3, 2012 A new synchronization protocol, G-6-G is now called Double Ovsynch. . Holstein dairy cows (2,400) will be synchronized (Double-Ovsynch) and blocked by parity and randomized to receive GnRH (200 ug) or saline on Day 5 after AI. An example would be CIDR Ovsynch Conclusions & Discussion. Natural Service Vs. OVSYNCH Sunday Monday Tuesday Wednesday Thursday Friday Saturday Double Ovsynch GnRH AM Lutalyse AM GnRH AM GnRH AM Lutalyse AM GnRH PM AI AM DOUBLE OVSYNCH CALENDAR Double Ovsynch - A full prebreeding Ovsynch protocol is applied without A. 9% pregnancies with Double Ovsynch and 29. In this protocol cows are submitted to a ‘presynchronizing Ovsynch’ followed seven d later by the ‘breeding Ovsynch’. _ Treatment D ay Heat Detect nt Day Heat Detect Heat Detect GnR Treatment Day Double Ovsynch G6G/Ovsynch@ t Day Cosynch Treatment D 12-24 t Day 26 2' 12-24 12-24 GnRH A. In summary, cows in the DO protocol had a greater ovulation rate to the first GnRH and a higher synchronization rate, larger ovulatory follicles and greater P/AI. 12-24 hrs . 2 mm) than Ovsynch), and they reported that ovulation rate to the the GPG group (16. In fact, these programs will result in a majority of cows receiving a TAI service. The Crestar system is especially recommended in beef cows as it causes an effective artificial luteal phase that is beneficial for corpus luteum function. There was no effect of quartile on number of ovulations, total embryos collected, or percentage of oocytes that clusion, fertility following Double-Ovsynch was significantly lower for the hydrochloride-based GnRH product likely due to poorer ovulatory responses throughout the synchronization protocol. Animal Reproductive Biology Group Division of Animal Sciences –Double Ovsynch Matt Lucy Animal Reproductive Biology Group The decreased variability to estrus can be explained by the fact that most of the cows on day 11 are on about day 8 of their estrous cycle. 7 vs. Blood samples were centrifuged at 3000 rpm for 20 min and serum was harvested and stored at –20 °C for later analysis of progesterone. 37%. However, fertility is not promising with Ovsynch especially in anoestrus buffaloes. The  Abstract. Mar 2, 2017 PGF2α injection of a Presynch-Ovsynch protocol with cows not detected with . For instance, Ficke estimates a double Ovsynch program can overcome 85% of anovular problems. How to cite this article: Gokhan Dogruer, Mustafa Kemal Saribay, Fikret Karaca and Yasar Ergun, 2010. 1%. Double Ovsynch . The main limitation of Ovsynch is the wide variability in synchronization rate (SR), defined in this protocol as regression of a CL and induction of ovulation in response to the final GnRH. Documentos relacionados. , 2009; Theriogenology 70:208-215 Effect P-value Treatment 0. Pre-Synch - Cosynch 72 . Fertility of lactating Holstein cows submitted to a Double-Ovsynch protocol and timed artificial insemination versus artificial insemination after synchronization of estrus at a similar day in milk range. Barletta1, Alessandro Ricci 1, Eduardo Trevisol , CIDR-Synch is the same as OvSynch except that CIDR’s are used between the first injection of Gonabreed and the injection of PG. 03 Parity 0. 2 cows/herd) and the average parity of these cows was 2. Daha sonra yapılan çalışmalarda 100 mcg gonadorelin uygulandı. 1). 50) BCS near AI had decreased fertility compared to cows with high (≥2. Ovsynch) compared to   Mar 14, 2017 another protocol, for example Double OvSynch. Although the cost for implementation of timed AI programs were $17 (DO-Res) and $21 (DO-DO) more expensive/cow/year than for estrous detection program Because of the limited numbers (reproductive studies require a large number of cows), no significant difference (Table 3) was seen between many of the protocols even though there was a large difference in pregnancy percent (Double Ovsynch at 38% versus Presynch-Ovsynch after cherry picking at 48%). The conception rate for the cystic ovary cases were also found higher (67%) than as estimated by Sankhi (1996). , 2013; Souza et al. Low Double Ovulation! High Fertility! 28 Choosing a Timed AI Program Ovsynch-56 vs. First AI A. The third benefit of a simple ovsynch program is that it brings forward the resynch phase by 16-18 days compared to a presynch program. , 2012). Day 10 fixed time AI am The Ovsynch program will synchronise cycling cows and some non-cycling cows. 53. Any presynchronization can be used with a synchronization program. Double Ovsynch. , Embrun, Ontario, K0A 1W1 Ph: (613) 443-5489 Fax: (613) 443-0686 embrunvet@bellnet. 6% (P < 0. A weekly schedule showing how Double Ovsynch looks on a calendar is illustrated in Figure 1. In a randomized controlled trial, cows were assigned either to be inseminated following a timed AI protocol (Double Ovsynch), or to be inseminated based on estrus detection by AAM. As a consequence, the development of the second follicular wave will be suppressed, which makes the synchronisation of Cows (n = 356) were randomly assigned to synchronization with Ovsynch (OVS), Presynch–Ovsynch (PO) or Double‐Ovsynch (DO) and inseminated on Day 77 ± 3 postpartum with either frozen‐thawed SS (n = 182) or CS (n = 184) of the same bull. , 2006), and either 6, 7 or 8 days later in experiment 2 (Bello and Pursley, 2007). 75 had a greater probability of becoming pregnant, but pregnancy rates were still lower than cows with higher BCS around the time of AI. Ovsynch — One GnRH injection (2 cc of Cystorelin, Factrel, Fertagyl, Double Ovsynch — A full prebreeding Ovsynch protocol is applied without A. Many cows in these programs will never show heat. Moved Permanently. 4 ⫾ 0. Group 1, group 2 and group 3 each contained 12 cows on the 25th, 32nd and 39th day of postpartum (as considered day 0), respectively. to the first GnRH of Ovsynch was 85% and cows synchronized to Ovsynch were approximately 96%. 37%). There was no effect of quartile on number of ovulations, total embryos collected, or percentage of oocytes that The double Ovsynch is a more efficient method for estrus presynchronisation in dairy cows and for induction of cycling in anovulatory cows (Ayres et al. Gholizadeh M. , Double Ovsynch and G6G). 01 Herlihy et al. Overall, 42% of cows lost BCS, 36% of cows maintained BCS, and 22% of cows gained BCS during the first three weeks of lactation. CO-Synch eliminates one animal handling by breeding Comparison of hCG vs GnRH effects in double Ovsynch on 71 The aim of the present research was to compare first-service conception rates after application of either human choriongonadotropin hCG or GnRH in the synchronisation part of a double Ovsynch protocol to anestrus dairy cows. 73. It is the reason some dairies are attaining conception rates exceeding 60% using first-service synchronization programs such as the G6G or the Double Ovsynch. Efficacy of Ovsynch protocol. , 2014). N. 42%. theriogenology. 5-8 Typically, both doses of GnRH are 100 µg because that dose, used to treat ovarian cysts, was once of cows with double ovulations and P/AI 35 d post AI, but decreased embryonic survival between 35 and 56 d post AI. The double ovsynch protocol is one of the well-established reproductive technologies in dairy cattle reproduction and it can also potentially improve fertility in water buffaloes if combined with TAI. Double ovsynch . As expected the strategy that included the AAM system resulted in reduced days to insemination for first AI service (12 d for primiparous and 7 d for multiparous) because of a voluntary waiting period In the first paper 1,887 Holstein cows from two commercial Wisconsin dairy farms were submitted to a Double-Ovsynch protocol for first timed AI, and BCS was evaluated at calving and 21 days after calving. the Double-Ovsynch protocol and appropriate blood samples were collected to determine if 2 PGF resulted in greater CL regression. This gives you yet another opportunity to get more cows pregnant early. Ovsynch48 PGF 56 h 16 h TAI C. 272 Morrison Hall (607) 255-0136. However, there was no difference in mean P4 concentrations (P = 0. Easily share your publications and get them in front of Issuu’s It is the reason some dairies are attaining conception rates exceeding 60% using first-service synchronization programs such as the G6G or the Double Ovsynch. 4% vs 33. This is because Ovsynch can be utilized as a tool to control time to first AI and subsequent inseminations following a negative pregnancy diagnosis. enhanced when cows are timed-inseminated with Ovsynch (Pursley et al. Giovanni M. A cool Double Ovsynch fact that many don't realize is that DOV can For example, researchers at the University of Wisconsin-Madison5 were able to start a Double Ovsynch resynchronization protocol 22 days after the previous . During construction this web tool will be evaluated yearly by our advisory group. The first service CR was 40. A new presynchronization system (Double-Ovsynch) increases fertility at first postpartum timed AI in lactating dairy cows. The protocol would be: GnRH d -17, PG d -10, GnRH d -7, GnRH d 0, PG d 7, GnRH d 9. PGF. 02 n=73 n=107 n=69 n=88 Jonathan Statham, Neil Eastham and John Smith. 11%. 2012. The Ovsynch program uses the hormone GnRH (Gonabreed or Receptal) and PG. Producers can go one of two ways: a double Ovsynch program, where GnRH is administered followed by prostaglandin seven days later and a second GnRH three days after that; or a variation that drops off the first GnRH treatment. But doing so can dramatically increase pregnancy rates. Ray Nebel and Mel DeJarnette, Senior Reproductive Specialists Brief descriptions of protocols with calendar timelines will allow you to determine the number of times cows must be Ovsynch . 651 Notre-Dame St. 1 and van Straten, M. Ovsynch protocol (n=10) having smooth ovaries, Group II: Double PG protocol (n=10) the animals that are cyclical and subestrus, Group III control (n=10) normal cyclic without any hormonal intervention. 3% 38. 576. Dec 11, 2015 It has been 20 years since the Ovsynch program was released to the industry Wiltbank said one way is to do a Double-Ovsynch followed by a  Typical Double Ovsynch calendar we are implementing in many of our clients herds. The ability of GnRH-PGF2α based protocols to effectively synchronise oestrus and ovulation is dependent on the stage of follicular development at the time of initial GnRH injection. After adding estrus detection, it is expected that 50% of the cows receive AI at detected estrus with a 30% CR across all AI services. —G -6 G A prostaglandin injection is given two days before a GnRH injection. PGF2C. , 2017 JDS (In press) Increased % cyclic before synch protocol Primi= 17 p. Request PDF on ResearchGate | On Oct 14, 2014, E. Research has shown that DO can yield conception rates 5-10% higher than Presynch. With Select-Synch ® , cows will show heat and ovulate naturally, but over 2 or 3 days. E2. • Cows losing BCS in the first 3 weeks postpartum had decreased fertility (Exp. Timed AI Optimized Fertility Programs Ovsynch Plus Activity Another study in Canada looked at a Double Ovsynch breeding program versus two different monitoring technologies on two Canadian dairies milking more than 500 cows each. Double-Ovsynch, compared to Presynch with or without GnRH, improves fertility in heat-stressed lactating dairy cows. Epub 2012 Oct 31. 48). This active area of research has resulted in a proliferation of synchronization protocols referred to using nonstandard nomenclature such as Ovsynch-56, Presynch, Cosynch, Double-Ovsynch, G6G, and Resynch-32. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. of Ovsynch either 4, 5, or 6 days later in experiment 1 (Bello et al. Low progesterone can be due to many things. , 2008) G6G (Bello et al. Below is a diagram for double OvSynch or another protocol, for example Double OvSynch (53, 55). The second GnRH injection of the prebreeding Ovsynch is  May 12, 2008 A new presynchronization system (Double-Ovsynch) increases fertility at first postpartum timed AI in lactating dairy cows. Baez* 1, Rafael V. Ovsynch-Resynch system (two treatments with PGF2α 10 to 14 days before Ovsynch), double synch (GnRH-7 d later- PGF2α, 3 d later GnRH and followed 7 d later by Ovsynch), and the supplementation with progesterone (P4) In those cows synchronized with Ovsynch, the probability of conception was lower for cows with a BCS less than 2. The Comparison of the Pregnancy Rates Obtained after the Ovsynch and Double Dose PGF 2α + GnRH Applications in Lactating Dairy Cows. Pre-Ovsynch. , 1997a, b). Increased fertility in lactating dairy cows resynchronized with Double-Ovsynch compared with Ovsynch initiated 32 d after timed artificial insemination. Stangaferro ML, Wijma R, Masello M, Thomas MJ, Giordano JO 2018 b: Extending the duration of the voluntary waiting period from 60 to 88 days in cows that received timed artificial insemination after the Double-Ovsynch protocol affected the reproductive performance, herd exit dynamics, and lactation performance of dairy cows. No cow past 100 DIM at first AI B. 56%. Material and methods These two results added together may double conception rates of lactating dairy cows. To solve this issue, in the past few years, injections of gonadotropin-releasing hormone (GnRH) have been incorporated into the program to pre-synchronize cows for first A. Box 12, Rehovot 76100, Israel. PO. The synchronization rate is less than 100% because cows respond differently based on the stage of the estrous cycle when Ovsynch is begun and on the number of follicular waves that occur during each cycle within a cow. The data were compared to a treatment effectuated during winter season. 3%) and increased the percentage of cows with high P4 (>= 3 ng/mL) at PGF (78. Usually a Double Ovsynch Presynchronization with Double-Ovsynch improves fertility at first postpartum artificial insemination in lactating dairy cows Article (PDF Available) in Journal of Dairy Science 95(12 Animals assigned to Double-Ovsynch received GnRH at 54 ± 3 DIM, followed by an injection of PGF 2α 7 d later, GnRH 72 h after PGF 2α , and then began the Ovsynch-56 TAI protocol 7 d later. 5. , 2001a & 2001b). However it seems that many of the CA dairies are now using the Double Ovsynch protocol (DO). The Ovsynch protocol, commonly used to synchronize ovulation for TAI in dairy cattle, consists of 2 GnRH treatments given 9 days apart, with PGF2α given 7 days after the first GnRH . The aim of the present study was to compare first-service conception rates after inclusion of either hCG or GnRH in Double Ovsynch to anestrous  Recently, Wiltbank et al. basis. Ovsynch (timed breeding program) consisted of two GnRH analogue injections, at 7 days before and 56 hours af- ter PG, followed by insemination, 16 hours after the second Double-Ovsynch helps to solve the problem of cows that are not ovulating. 001. (2015 b). In the present study, although preovulatory fol- developed a new presynchronization protocol (Double licle size was lower in the HPG (15. 101:717-735. 36%. doi: 10. Ovsynch Heat Detection Protocol • Consists of a single GnRH injection on day 1. Double Ovsynch 6 27 48 5-6 40 PG-3-G 5 20 55 5-6 40 G-6-G 5 18 57 4-5 40 University of Wisconsin – Madison School of Veterinary Medicine Department of Medical Double-Ovsynch compared with presynch with or without Gn RH improves fertility in heat-stressed lactating dairy cows. • Cows gaining BCS in the first 3 weeks The purpose of presynchronization is to initiate the Ovsynch protocol at the ideal time in the estrous cycle to optimize fertility [2–6] . 11. Cosynch 72 . Ovsynch This system has an important advantage of possible fixed time insemination without the necessity for oestrus detection This system allows for insemination without heat detection. eCG. Much has been discussed about the Double-Ovsynch protocol lately. 001) Reduced AI by ED = 32. , 2000; DeJarnette et al. Extending the duration of the voluntary waiting period from 60 to 88 days in cows that received timed artificial insemination after the Double-Ovsynch protocol affected the reproductive performance, herd exit dynamics, and lactation performance of I believe I did the ovsynch 56. , 2001). Double-Ovsynch, compared with presynch with or without GnRH, improves fertility in heat-stressed lactating dairy cows Double-Ovsynch, compared with presynch with or without GnRH, improves fertility in heat-stressed Many farms initially implemented a Presynch-Ovsynch protocol using a 14 d interval between the second PGF2α treatment of Presynch and G1 of the Ovsynch protocol to keep the first 4 treatments of the Presynch-Ovsynch protocol on the same day of the week. 1, 2 1 The Koret School of Veterinary Medicine, the Hebrew University of Jerusalem, P. Fertility obtained with the Ovsynch protocol is highest when cows ovulate to the first GnRH injection. (Double Ovsynch). 1 vs. This system increased pregnancy rates compared to Ovsynch alone for the reasons outlined above, when the Ovsynch protocol is initiated in While Double Ovsynch is commonly used in confinement herds in the United States, Foremost is the first to use the system in a grazing herd, Poock says. 30%. 3%). 4 (±1. Recently, couple studies compared the Double-OvSynch with the classic Presynch-OvSynch revealing that the Double-OvSynch outperformed the Presynch in high- Herds with efficient/accurate estrus detection: Ovsynch-56 only Cows inseminated in estrus = 44. 1%) and increased the percentage of cows with medium progesterone concentra- Efficacy of the Ovsynch is depended on the stage of follicular development at the time of initial GnRH injection [3]. G. and to induce cyclicity in anovular cows is called Double-OvSynch (Ayres et al. The original Presynch-Ovsynch program entailed two injections of PGF 2a· given 14 days apart with the Ovsynch protocol initiated 12 days after the second injection of PGF 2a· for presynchronization (Figure 2). 2α injection), and day +2 (second GnRH injection) in the Select Synch and Ovsynch heifers, and on the corresponding days in the control heifers. For both the Double-Ovsynch and G6G protocols, the presynchronization protocol involves GnRH injection(s) instead of PG injections as in the Presynch-Ovsynch protocol. Colazo M. The aim of this study was to evaluate the effect of Double-Ovsynch protocol on various fertility parameters at different postpartum days in dairy cows. PGF20GnRH. It’s the one my AI guy said to use, maybe give your tech a call and see what they can recommend for you? Double Prostaglandin Synchronization • Consists of a double prostaglandin injection over a 14-day interval. This new pre-synchronization is named Double-Ovsynch because an Ovsynch protocol is used during the pre-synchronization period instead of two PGF 2α injections. The conception rate of repeat breeder cattle after treating with Gonadorelin by Sankhi (1996) was 46%. It was concluded that the programme consisted of 14 days interval double dose PGF 2α injections, GnRH applications 48 h following the second PGF 2α injection and timed artificial insemination artificial insemination Subject Category: Techniques, Methodologies and Equipment Although Double-Ovsynch seems to be a very consistent protocol for lactating cows, farmers must make sure that the correct hormonal treatments are given at the correct times, to correct cows, with Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. In addi-tion, use of an Ovsynch protocol to presynchronize cows (i. In those cows synchronized with Ovsynch, the probability of conception was lower for cows with a BCS less than 2. 2xPGF/Ovsynch56. A recent study showed that cows timed-AI following Double-Ovsynch had 10% points greater conception rates for first service compared with AI following heat detection (49% vs. Introduction In this example, the user describes the current program for first service as Double-Ovsynch (82 d voluntary waiting period; 45% CR) followed by Ovsynch for resynchronization (IBI for TAI of 42 d; 30% CR). , 1995). Learn vocabulary, terms, and more with flashcards, games, and other study tools. – 5Research shows use of a double ovsynch program results in the highest conception rate (47%) at first service. Ovsynch uygulamasında GnRH kullanıyla ilgili yapılan ilk çalışmalarda ovulasyonu indüklemek için güçlü bir GnRH analoğu olan buserelin 8 mcg dozda kullanıldı. The CIDR is inserted at first GnRH and removed at PGF. FSH. No one likely relishes the thought of giving an additional prostaglandin shot in the Double-Ovsynch protocol for first timed artificial insemination (A. This strategy is shown to get more cows pregnant while tightening up the number of cows bred by the VWP. 3 The Double Ovsynch protocol started on average at 38 DIM (±4. Double-Ovsynch in high-producing dairy cows: effects  Oct 26, 2016 No one likely relishes the thought of giving an additional prostaglandin shot in the Double-Ovsynch protocol for first timed artificial insemination  S. 48 hrs. Ovsynch or CIDR-Synch AI EDAI 32 or 39 d* NPD Ovsynch Cows with CL EDAI 7 d Cows without CL Second and greater service PGF Key facts:-increases cows EDAI after non-pregnancy diagnosis-treatment adapted to cow physiological status-beneficial to use synch protocol after PGF treatment AI 7 d GnRH PGF PGF TAI 7 days 24 h 32 h 16-18 h GnRH Double Ovsynch + Double Ovsynch 45 39-12 Giordano et al. Another synchronization protocal recently developed is the G6G Ovsynch. In conclusion, during summer the utilization of a double instead of single PGF 2α treatment into a P4-based Ovsynch-FTAI protocol did not increase pregnancy rate at FTAI but improved cumulative pregnancy rate. (2015), who added a PG dose to the original Ovsynch and Double Ovsynch, ex- Double Ovsynch PGF GnRH GnRH PGFGnRH TAI Sun Tue Mon Mon Wed Thu EC Day 6 G6G Presynchincreases fertility 5–7% units. Therefore, the aim of the current study was to com-pare presynchronization using a modified Ovsynch pro-tocol (i. The second phenomenon that can reduce the efficiency of OvSynch is non-occurrence  Oct 16, 2018 Fertility of lactating dairy cows inseminated with sex‐sorted or conventional semen after Ovsynch, Presynch–Ovsynch and Double‐Ovsynch  (Double-Ovsynch; DO) were presynchronized using a modified Ovsynch protocol (GnRH at 53 ± 3 DIM, 7 d later PGF2α, and GnRH 3 d later) ending 7 d before  ABSTRACT. For example, Double-Ovsynch decreased the percentage of cows with low circulating progesterone concentrations (<0. Key Words: follicle, fertility, progesterone 678 Effect of a second dose of prostaglandin F 2a during Double-Ovsynch on successful luteolysis and fertility. With Ovsynch and CO-Synch ®, a second shot of GnRH causes ovulation. This study evaluated a novel presynchronization method, using Ovsynch prior to the Ovsynch-timed AI protocol (Double-. G-6-G - A prostaglandin injection is given two days before a GnRH injection. , 1, 2 * Tsitrin, K. rect comparison between the Double-Ovsynch protocol and a simpler GGPG protocol for submission of cows for first TAI has not been reported. 75) BCS (Exp. Follicle stimulating hormone. 5d Cosynch 72 . § Co-Synch is a specific form of Ovsynch in which the TAI occurs at the time of the second GnRH injection. Primiparous and multiparous lactating dairy cows (N = 183), and nulliparous dairy heifers (N = 51) were used. Easily share your publications and get them in front of Issuu’s Double-Ovsynch decreased the percentage of cows with low P4 (<1 ng/mL) at G1 (9. We also propose to develop a new, interactive web based / CD educational tool we hereafter refer to as Designing and Troubleshooting Ovsynch (DATO). Double Ovsynch®. Este protocolo induce la ovulación en un alto porcentaje de vacas en anestro, pero algunas tienen una fase lútea posterior más reducida lo que produce tasas de gestación más bajas que las vacas cíclicas. treated with one of three protocols: a) TAI after the Double-Ovsynch protocol  This study investigated the fertility of dairy cows during summer season after treatment with a single or double PGF2α in a progesterone (P4)-based Ovsynch  however, that cows submitted to the Double-Ovsynch are less likely to be observed in estrus because of the multiple GnRH injections that they receive and this. 74 %. Therefore, the present study was conducted to compare between the effect of estrus synchronization using double doses of PGF 2α and synchronization of ovulation with (ovsynch-CIDR) or without (ovsynch) supplementation of P4 followed by FTAI on the pregnancy rate of Egyptian crossbred dairy cows. 51%. double ovsynch

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