EFFECT OF OVSYNCH AND PRESYNCH PROTOCOLS ON FERTILITY AND SERUM PROGESTERONE IN REPEAT BREEDER COWS UNDER FIELD CONDITIONS

Authors

  • K MURUGAVEL Department of Veterinary Gynaecology and Obstetrics, Rajiv Gandhi Institute of Veterinary Education and Research, Kurumbapet, Puducherry - 605 009
  • H HEMALATHA
  • S KANTHARAJ
  • D ANTOINE
  • MS RAJU

Keywords:

Conception rate, Ovsynch, Presynch, Progesterone, Repeat breeder cows

Abstract

Repeat breeder cows, maintained under field conditions, were inseminated at observed estrus without any treatment (control, n=15), were subjected to Ovsynch (n=13; d0 and d9 - GnRH 10 μg im; d7 - PGF2α 500 μg im; day 10 - AI 16 h after d9 GnRH) or Presynch (n=16; Two PGF2α at 14-day interval and initiating Ovsynch 12 day after the second PGF2α) protocols. The pregnancy rate on d45 post-AI for control, Ovsynch and Presynch groups were 20%, 46.1% and 37.5%, respectively. In both treatment groups, serum progesterone between pregnant (P) and non-pregnant (NP) cows at the time of first GnRH injection was similar (p>0.05). Serum progesterone on the day of AI was lower (p<0.05->0.05) and on d6 post-AI was higher (p<0.05) in P cows compared to their NP counterparts in all the groups. In brief, ovsynch protocol even without pre-synchronization enhances conception rate in repeat breeder cows.

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Published

2022-12-31

Issue

Vol. 39 No. 2 (2018): Indian Journal of Animal Reproduction

Section

Research Article

How to Cite

MURUGAVEL, K., HEMALATHA, H., KANTHARAJ, S., ANTOINE, D., & RAJU, M. (2022). EFFECT OF OVSYNCH AND PRESYNCH PROTOCOLS ON FERTILITY AND SERUM PROGESTERONE IN REPEAT BREEDER COWS UNDER FIELD CONDITIONS . The Indian Journal of Animal Reproduction, 39(2), 43–46. Retrieved from https://acspublisher.com/journals/index.php/ijar/article/view/3847