Effectiveness of estrous synchronization using prostaglandin (PGF2α) in Bali cows

The objective of this study was to know the effect of estrous synchronization using prostaglandin (PGF2α) hormone injection in producing the percentage of estrus in Bali cows. Palpation of rectal examination on 70 Bali cows was carried out using plastic gloves to select the cows. The results were 44 Bali cows in pregnant condition, follicular phase, and anestrus. There were 26 Bali cows in the luteal phase, used in this study. All Bali cows in the luteal phase were injected with prostaglandin hormone intramuscularly followed by estrus detection from one day after injection. The parameters measured were the number of Bali cows that become estrus and pregnant, and signs of estrus that expressed. The results of this study showed that the injection of prostaglandin (PGF2α) effectively produced a high response of estrous of Bali cows and the pregnancy rate was accounting for 77%. As conclusions, synchronization of estrus in Bali cows using prostaglandin (PGF2α) is effective in producing a 100% estrus response, the luteal phase in cows was a major success for synchronizing estrus and pregnancy rate was relatively high at first AI.