Resumption of ovarian cyclicity and fertility response in bull-exposed postpartum buffaloes

Animal Reproduction Science
P P GokuldasA K S Tomar

Abstract

A study was undertaken to evaluate the effect of bull exposure on resumption of ovarian cyclicity and fertility response in postpartum buffaloes raised under standard farm conditions. A total of 24 Murrah buffaloes was randomly grouped to receive one of the following treatments: (1) exposure to a vasectomised bull from 40th to 90th day postpartum (bull-exposed, BE, n=11) and (2) isolated from bull (non-exposed, NE, n=13). Changes in the progesterone concentration were used to assess the resumption of ovarian cyclicity. Postpartum interval to resumption of ovarian cyclicity (47+/-2.58 days vs. 56+/-2.37 days, p<0.05) as well as behavioral estrus (57+/-3.61 days vs. 71+/-5.13 days, p<0.05) was shorter in bull-exposed animals than control animals. Similarly, animals in the BE group had significantly shorter interval to postpartum ovulation (48+/-2.69 days vs. 57+/-2.37 days, p<0.05). Reduced incidence of silent ovulation was observed in BE group compared to NE group (18.18% vs. 50%). More than half proportion of animals in BE group conceived by 60 days postpartum compared to a very low proportion of animals in NE group (54% vs. 15%, p<0.05). Furthermore, first service conception rate in BE animals was significantly greater than NE...Continue Reading

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