EFFECT OF CIDR AND PGF_(2alpha) TO IMPROVE THE CONCEPTION RATE IN HOLSTEIN FRIESIAN CROSSBRED HEIFERS

摘要

The objective was to evaluate the efficacy of an intravaginal progesterone insert and injection of PGF_(2alpha) for synchronizing estrus in Holstein Friesian heifers under field condition. The heifers were divided into two groups each consisting of eighteen (n=18) animals. Group I animals served as control and Group II animals were treated with an intra vaginal P4 device (CIDR) for 9 days and PGF_(2alpha) was given intramuscularly 24 hrs prior to CIDR removal. Fixed time artificial insemination was carried out at 48 and 72 hrs after CIDR removal. The overall conception rates obtained was 33.33 % in group I animals and 77.77 % in group II animals treated with CIDR and PGF_(2alpha).