Efektivitas Sinkronisasi Estrus dan Fertilitas Spermatozoa Hasil Sexing pada Sapi Bali di Sulawesi Tenggara (EFFECTIVENESS OF ESTRUS SYNCHRONIZATION AND SPERMATOZOA FERTILITY RESULTS OF SEXING ON BALI CATTLE IN SOUTHEAST SULAWESI)

Estrus synchronization is one of the reproduction technology applied in the cows that aim to induce estrus of some cows to occur in the same time. In this research, all cows expressing estrus would be inseminated using sexed sperm that produced using column albumen method. Sexing sperm technology could be applied to produce the desired sex of calf. Effectivity of chilled sexed sperm to produce the desired sex of calf was evaluated in this research. Sixty three bali cows divided into 2 groups of ages (3-4 yo. and 56 yo.) were used and performed synchronization using Capriglandin (PGF2α) hormone prior to application of artificial insemination with chilled sexed sperm. Variable measured were success rate of synchronization, estrus post synchronization, estrus quality, non return rate, conception rate and calving rate. The results showed that 62.90% of cows showed estrus following synchronization, estrus post synchronization occurred at 71.73 hours following synchronization, and estrus quality was 2.5%. There were 82.54% of inseminated cows was predicted to be pregnant after first insemination using chilled sexed sperm. However, only 73.02% could maintain the pregnancy up to calving. Whereas 78.26 % of newborn calf was male calf. Finally, it was concluded that PGF2α was effective to trigger estrus in bali cows, while sexed sperm still had good fertility and the sex of newborn calf was 78,26% confirmed the prediction.