Abstract

The aim of this study was to determine the differences ofestrous response, service per conception (S/C), non return rate (NRR),and conceptionrate (CR) between Bali cattle heifersandcowssynchronized using intra-vaginal progesterone hormone. Two groups of Bali cattle, 15 heifers and 15 cows, were used to examine the response differences of estrous synchronization using progesterone hormone on reproductive performance, between different parity. Each group was given progesterone dose of 1 mg/kg body weight. The data observed were estrousbehavior (estrousintensity, onset of estrous, estrous percentage), and value of S/C, NRR, and CR were analyzed by statistical analysis (t-test). The result shows the estrous intensity was significantly different (P<0.05) between the heifers and cows. The average estrousintensity score of the heifer was 2.870.35, while the cows was 2.270.45. There was significantly different (P <0.05) in onset of estrous in the cows 41.55.18 hours, while in the heifers was 50.673.5 hours. The estrouspercentage of the heifers and cows was the same, both of them was 100%. There was no significant difference (P>0.05) in S/Cvalue showed by the heifers (1,310,45)and the cows (1,500,50). The average value of NRR, for heifers and cowswas 86.67% and 80.00%, respectively. The average value of CRfor heifers and cowswas 86.67% and 80.00%, respectively.

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