The Impact of Different Estrus Synchronization Programs on Postpartum Holstein Dairy Cow Reproductive Performance | ||||
| Mansoura Veterinary Medical Journal | ||||
| Article 5, Volume 22, Issue 3, September 2021, Page 124-130 PDF (603.9 K) | ||||
| Document Type: Original Articles | ||||
| DOI: 10.21608/mvmj.2021.93141.1078 | ||||
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| Authors | ||||
Adel Hussien1; Heba Sharawy1; Yasser Lenis2; Daniela James3; Ozge Turna4; Engy Risha5; Wael Eldomany; Samy Zaabel6; Mohammed Elmetwally   1
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| 1Mansoura University, Faculty of veterinary Medicine | ||||
| 2Departamento de Ciencia Animal, Facultad de Ciencias Agropecuarias, Universidad Nacional de Colombia, Palmira, Colombia | ||||
| 3Faculty of Agricultural Sciences, University of Applied and Environmental Sciences U.D.C.A. Bogota, Colombia | ||||
| 4Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Istanbul-Cerrahpasa University, Istanbul, Turkey | ||||
| 5Department of Clinical pathology, Faculty of veterinary medicine, Mansoura University, Mansoura 35516, Egypt | ||||
| 6Department of Theriogenology, Faculty of Veterinary Medicine, Mansoura, University, Egypt | ||||
| Abstract | ||||
| Objective: The purpose of this study was to see how the Ovsynch, modified Ovsynch, presynch, and modified presynch protocols affected postpartum reproductive performance in dairy cows. Design: Randomized controlled experimental study. Animals: The current research involved 412 dairy cows. Procedures: The cows were split into four groups: GnRH was given on day 0, PGF2∝ on day 7, and GnRH on day 9. Group 1: (Ovsynch protocol, n= 117) received GnRH on day 0 and PGF2∝ on day 7. Group 2 (modified Ovsynch, n=113): PMSG on day 0, PGF2 on day 7, and PMSG on day 9. Group 3 (presynch protocol, n=98) got two doses of PGF2 14 days apart, which allowed for a 12-day delay in the start of Ovsynch. Group 4 (modified presynch protocol, n=84) got two PGF2∝ doses 14 days apart, which was 12 days before the start of modified Ovsynch. All of the animals were artificially inseminated 16 hours following their last GnRH or PMSG dose. The ovarian rebound, number of services per conception, days open, and calving interval were the measures for determining reproductive performance for the dairy cows. Results: The main effect of the synchronisation program showed no significance for ovarian rebound (P >0.05). The S/C, days open and calving intervals were decreased significantly (P＜0.05) in the 3rd and 4th groups when compared with the cows that received either GPG or PMSG treatment only. All four groups had a conception rate of 35.04 (41/117), 40.7 (46/113), 44.8 (44/98), and 57.14 (48/84) %, respectively (P＜0.05). Conclusion and clinical relevance: It was investigated that giving two PGF2 injections before Ovsynch, either utilizing GnRH or PMSG methods, improved the reproductive performance of dairy cows. Furthermore, cows given PMSG had a greater conception rate than cows given GnRH. | ||||
| Keywords | ||||
| Ovsynch; Presynch; PMSG; synchronization; Holstein cows | ||||
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