EFFECTS OF BUSERELIN ACETATE ON CONCEPTION RATE IN REPEAT BREEDING DAIRY CATTLE

Abstract

The aim of the present study was to evaluate the effect buserelin acetate given 12 days post Al and
double inseminations during estrus period of dairy cattle on improvement of conception rate. Field trial was
carried out on repeat breeding cross breed dairy cows which are lactating and apparently healthy that exhibits
estrus regularly. A total of forty four repeat-breeding cows from twenty herds were selected and assigned
randomly in to two equal groups, A and B: one treated and one control group. Group A (n=22) cattle were
treated intramuscularly with 10 μg buserelin acetate 12 days post Al. Group B (n=22) cattle were inseminated
once during estrus exhibition with single service and considered as control. Dairy cows were examined for
pregnancy after three months through rectal palpation. Pregnancy rates recorded were 55%, and 32% in A
and B respectively. The conception rates of treated group exceed control group by 23% respectively. Treated
group showed a significant statistical variation (P<0.05) as compared to control groups. It is recommended
that the use of GnRH injection 12 days post Al and can improve pregnancy rate in repeat breeding cross bred
dairy cows.