Semen Production of Simmental Bulls based on Different Body Weight at National Artificial Insemination Center (NAIC), Singosari Indonesia

Body weight is a factor that affect semen production and quality in bull. This factor is also counted in bull's selection. The aim of this research was to evaluate the effect of body weight on the semen production of Simmental bull at National Artificial Insemination Centre, Singosari, Indonesia. A total of 323 ejaculate data of semen collected from 17 Simmental bulls aged 4 to 8 years old were used in this study. Body weight ranged 700 kg to 1100 kg, and was divided into four groups of 700 to <800 kg as Group one, 800 to <900 kg as Group two, 900 to <1000 kg as Group three, and >1000kg as Group four. The observed parameters were semen production and qualities, which consisted sperm motility and sperm concentration. The results showed that the body weight affect the semen volume and sperm motility, but had no effect on the sperm concentration. The research concluded that the body weight of Simmental bulls affect its total semen production and qualities