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Estrus Performance and Pregnancy Rate in Types of Local Cows on Different Estrus Synchronization Protocols
Authors: Yendraliza Yendraliza, Lia Lia, Jully Handoko, Anwar Efendi Harahap
Number of views: 26
The research aimed to evaluate the onset of estrus, conception rate, pregnancy rate and duration
of estrus in Bali cow, limousine cow and rambon cow after being administered with three different
hormones to syncrhronize estrus. A randomized block design with two factors, type of cow and hormone
dose, was performed. Fifty-four postpartum cows consisted of the three breeds were administered to a
single dose of PGF2α (5 ml per cow), a double dose of PGF2α (10 ml per cow) and combination of PGF2α and
hCG (1,500 IU per cow). An analysis of variance showed that different breeds did not associate with the
hormone doses and their combination, as evident from the onset of estrus, duration of estrus, conception
rates and service per conception. However, different cow breeds showed the same onset of estrus, service
per conception and the different onset of estrus and pregnancy rates. On the other hand, different doses of
PGF2α and its combination with hCG generated different onset of estrus, duration of estrus, and pregnancy
rates, but shared common service per conception. In conclusion, Bali cow demonstrated a more
appropriate fertility than Limousin cow and Rambon cow. A combination of PGF2α and hCG showed the
most adequate hormonal treatment to synchronize the estrus compared to single and double doses of
PGF2α.