FERTILITY RATES IN REPEAT BREEDER COWS FOLLOWING SYNCHRONIZATION OF OVULATION
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Date
2019-12
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Abstract
The study was conducted to study the efficacies of various combinations of Ovsynch protocol on the
conception rate in the repeat breeder cows. A total number of 80 repeat breeder cows were randomly and
equally divided into four experimental groups viz., Group I to III (Treatment groups) and Group IV (Control
group). Cows of group I were treated with Ovsynch protocol. The treatment procedures for group I were
followed for groups II and III. Additionally, the group II cows were given 10 μg of GnRH (3rd GnRH) 7 days
after timed AI and the group III cows were administered with 12,00,000 IU of Vitamin A injection during
the commencement (d 0) of the Ovsynch treatment. Group IV cows (control) were observed for estrus and
artificial insemination was done during the observed estrus. Cows belonging to groups I to III were bred by
TAI at 16-18 hours after the 2nd GnRH injection of Ovsynch protocol (d 10) and at observed estrus in group
IV. Those cows which failed to conceive were subjected to artificial insemination in the subsequent estrus. the
percentages of first service, second service and overall conception rates observed in this study were 30.00,
20.00 and 50.00 in group I; 60.00, 20.00 and 80.00 in group II; 50.00, 30.00 and 80.00 in group III; and 10.00,
20.00 and 30.00 per cent in group IV, respectively. From the study it is concluded that Ovsynch+ post AI
GnRH injection or vitamin A injection along with Ovsynch protocol were found to be the best protocols to
augment fertility in repeat breeder cows under field condition
Description
TNV_35thVCRI_CA_Dec-2019_IFBP-13
Keywords
Veterinary Science