Abstract
A study was carried out on 20 repeat breeding crossbred cows to evaluate the use of ovsynch protocol (Hormonal Protocol) in improving the reproductive efficiency. All the repeat breeding cows were treated with 0.02mg GnRH (Receptal 5 ml i/m) on the day of estrus, on 7th day of estrus cows were given PGF2a (Lutalyse 5 ml I/m) and on 9th day of estrus, all repeat breeding cows were given repeat dose of 0.02mg GnRH (Receptal 5 ml i/m). Artificial insemination was carried out on 24 hrs after last GnRH injection. Conception rate in first, second, third service and overall conception rate was 30.0, 20.5, 5.0 and 55.0 per cent, respectively. Hence, ovsynch protocol is recommended for their judicious use in the field to solve the problem of repeat breeding cross bred cows.
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