EFFECT OF CIDR AND PGF, TO AUGMENT FERTILITY IN REPEAT BREEDING HOLSTEIN FRIESIAN CROSSBRED COWS

摘要

The aim of this study was to evaluate the effect of CIDR and PGF2a to improve the conception rate in repeat breeding Holstein Friesian crossbred cows under field condition. The study was conducted on 56 Holstein Friesian crossbred cows. The selected animals were divided into group I (n=28) and group II (n=28). Group I animals were served as control and were inseminated during natural estrus and animals in group II were treated with an intravaginal P4 device (CIDR) for 9 days and PGF2ce 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 25 per cent in group I animals and 60.71 per cent in group II animals treated withCIDR and PGF2a