Efficacy of different hormonal protocols for oestrous induction in postpartum anoestrous and suboestrous cows

A study was conducted on 95 Red Sindhi x Jersey crossbred postpartum anoestrous/Subestrous animals. Sixty animals were divided into three categories depending on presence/absence and category of follicle/CL on the ovary. The animals with smooth ovaries (n=12) were treated with double dose of GnRH at 2 weeks interval. The animals (n=13) having ovaries with small follicle (5 mm) were treated with single dose of GnRH. The animals with medium/large sized follicle (10 mm or more) were either treated with co-synch (GPG, n=12) or modified ov-synch (GPH, n=13) protocol, while the animals having ovaries with CL/RCL (n=10) were treated with double dose of PG at 11 days interval. Thirty five PPA animals irrespective of different ovarian status were either treated with homoeopathic drugs (n=7) or served as untreated control (n=28). Out of the six treatment groups, the groups treated with GPG or GPH protocol resulted in highest response (100%, 100%) in oestrus induction as well as conception rate (58.33% and 76.92) as compared to other groups including control.