Improvement of Fertility Rate Using Ovsynch and Biostimulation Protocols with Timed Artificial Insemination in Thari Cattle

The study was carried out to compare efficacy of estrus synchronization protocols with or without biostimulation in Thari cattle. A total of forty Thari cattle maintained at semi intensive management conditions at Thari Cattle Farm Nabisir Road, Distt: Umerkot were used in the study. The selected animals were divided into four groups to observe estrus signs and artificial insemination. Animals of group B and D were treated with OvSynch (GnRH at day 0 followed by PGF2a day 7 and 2nd GnRH at day 9) for estrus synchronization but D was bio-stimulated and B was not bio-stimulated. Animals in group A and C were treated with 2ml normal saline on day 0, 7 and 9 of the treatment. Group C was biostimulated and A was not biostimulated. The results showed that estrus response (60 %) and pregnancy rate (50%) was higher, onset of estrus was earlier (54.89 +/- 1.20), duration of estrus was long (23.17 +/- 1.20) in group D as compare to other groups. It was concluded in the present study that the biostimulation with ovsynch protocol can effectively be used to induce cyclic activities and increase estrus response and fertility rate in Thari cattle.