Effect of bull exposure on the post-partum reproductive efficiency in cholistani cows [Cholistani ineklerde boğa maruziyetinin doğum-sonrası üreme etkinliği üzerine etkisi]

The present study was conducted with the objective to determine the effect of bull exposure on postpartum resumption of ovarian activity,first behavioural oestrus and conception rate in cholistani cows. a total of 24 cholistani cows kept at shadabad cooperative livestock farms cholistan,pakistan during september-2012 to january-2013,were divided into two groups. bull exposed (be) cows (n=18) were exposed to mature bull throughout the study period whereas bull not exposed (bne) cows (n=6) were not. both groups were kept under similar feeding and management conditions. the mean interval from the calving to resumption of ovarian activity was 39.75±3.19 days in the be and 49.75±2.75 days in bne animals (p<0.05). the mean interval from the calving to the first behavioural oestrus was 46.93±0.48 days in be and 57.5±1.29 days in bne animals (p<0.05). during the study period,more (p<0.05) cows from the be group (16/18 = 88.88%) showed behavioural oestrus as compared to the bne group ones (4/6=66.66%). the conception rate in be and bne cows were 66.66% and 33.33%,respectively (p<0.05). it was concluded that,cows exposed to the presence of bulls at early postpartum periods showed reduced intervals from the calving to resumption of ovarian activity,first behavioural oestrus and resumed cyclicity earlier. © 2015,veteriner fakultesi dergisi. all rights reserved.