National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The study was designed to evaluate behavioural estrus signs and fertility response following spontaneous and Ovsynch induced estrus in Sahiwal cows. Group 1: (Spontaneous estrus group; n=20) cows were observed visually and ultrasonographically from a random day till occurrence of spontaneous estrus and ovulation. Group 2 (Ovsynch group; n=10) were administered with standard Ovsynch protocol (two GnRH 20µg on day 0 and 9 and PGF 500µg on day 7, i.m.) started at random day of estrous cycle to synchronize estrus and ovulation. In group 1, the estrus characteristics viz. cervico-vaginal mucus discharge, mounting, vulvar swelling, bellowing and frequent urination were observed in 70, 65, 30, 10 and 20 percent cows, respectively as compared to 70, 40, 20, 30 and 20 per cent in group 2. In ovsynch group, higher size of dominant follicle (7 to 10 mm) at time of prostaglandin injection favoured subsequent ovulation, whereas, cows having smaller dominant follicle (< 7 mm size) failed to undergo ovulation. Similarly, average diameter of DFs on Day 10 was higher in cows showing ovulatory estrus as compared to non ovulatory cows in the Ovsynch group (11.9±0.27 vs. 9.25±1.18, respectively, P<0.05). Results suggested that CVM discharge and mounting activity were the two prominent signs expressed during estrus and efficacy of Ovsynch protocol initiated at random day of estrous cycle was lower in inducing ovulatory estrus and pregnancy in comparison to spontaneous estrus in Sahiwal cows.
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