Correlation of parity and age to services per conception, conception rate, and gestation length in Holstein Friesian cross cows

Small farmers dominate dairy farming in Indonesia, and the average productivity is low. The contribution of domestic production only reaches about 23% total national milk consumption needs as a source human nutrition. This study was aimed to identify relationship between cow's parity age services per conception (S/C), rate (CR), gestation length (GL) Holstein Friesian (HF) cross cows. Data this consisted primary data obtained from interview, secondary Cooperative Unit Argopuro village, Krucil, Probolinggo. Sample size 200 cows, which 10% population. were analyzed for correlation linear regression using Statistic Package Service Solution (SPSS) software version 20 (IBM Corp., USA) at 95% confidence level. S/C, CR, GL 2.55 ± 1.57, 21%, 278.19 11.92 days, respectively. There no significant (p >0.05) with CR GL. <0.05) S/C. Regression S/C based on followed equation = 0.104 + 0.407*age, coefficient determination 0.733 0.538, It could be concluded that predicted