Indian Journal of Veterinary Research (The)
Open Access
  • Year: 2011
  • Volume: 20
  • Issue: 1

The administration of GnRH plus PGF2 alpha synchronizes the estrus in anestrus crossbred cows exposed to bull urine

  • Author:
  • S. Ahmad, H. Kumar1, G. Singh1, M.K .Patra
  • Total Page Count: 4
  • Page Number: 42 to 45

1Division of Physiology and Climatology, Indian Veterinary Research Institute, Izatnagar – 243122 (Uttar Pradesh)

Animal Reproduction Division, Indian Veterinary Research Institute, Izatnagar – 243122 (Uttar Pradesh)

*Corresponding authors

Online published on 17 September, 2011.

Abstract

The objective of this experiment was to study wheather the administration of GnRH plus PGF2 alpha synchronizes the estrus in anestrus crossbred cows exposed to bull urine (BU) during the winter season (Nov to Feb). The results indicated that a greater proportion of BU-exposed cows (n=20) showed estrus as compared to control (n=8) (90 vs 37.5% P<0.05). The mean plasma progesterone concentration remained below < 1ng/ml in all animals of each group during the treatment period. The overall conception rate was double in BU-exposed cows (66.7 vs 33.3% P<0.05). From this experiment it can be concluded that oro-nasal application of BU synchronizes the estrus in a greater proportion of anestrus cows treated with GnRH plus PGF2 alpha during winter season.

Keywords

Biostimulation, bull urine, GnRH, PGF2 alpha, estrus induction, anestrus cows