Genetic Parameters Estimation on the Reproductive Characteristics of Friesian Holstein Crossbred (PFH) Dairy Cows

The research aims to estimate the genetic parameters of Friesian Holstein crossbred (PFH) dairy cows which determines its reproductive efficiency based on the repeatability value. The research was conducted in the Agro Niaga Cooperatives dairy farm in Jabung, Malang Regency. The materials used in this research were the reproduction data of 50 PFH dairy cows collected through direct observation and interview with the dairy farmers and inseminators. In addition, the data in this research were obtained from PFH dairy cows which gave birth for three to four times, thus a total of 125 data for each reproductive characteristics were collected. The observed reproductive characteristics data include service per conception (S/C), days open (DO), and calving intervals (CI). The obtained data were then analyzed with one-way analysis of variance (ANOVA) in intraclass correlation unbalanced model. The results showed that the mean S/C, DO, and CI was 2.68±1.52; 146.39±76.89 days; and 420.63±79.71, respectively. The repeatability value of S/C was categorized as low (0.112±0.093), while the observed DO and CI were categorized as medium (0.258±0.081 and 0.318 ± 0.076, respectively). The research concluded that the PFH dairy cows' selection should follow the DO or CI, and not on its S/C as it showed low repeatability value