Genetic Trends and Improvement of Carcass Traits and Calving Interval in Japanese Black Cow

Abstract

Recently, the calving interval is not so improved though the growth of Japanese Black cow. This study was conducted in order to how genetic trends and improvement of carcass traits and calving interval in Japanese Black cow. Heritability of carcass traits measured by ultrasonic diagnosis was a low value. However, the annual trends of breeding value rose. Heritability of calving interval was an extremely low value. However, the variation between individuals was admitted by the value of genetic variance. Breeding value of calving interval has risen every year. It has been improved performance and carcass traits in Japanese Black, from now on, it needs the improvement of cow's ability, calving interval etc, to keep steady Japanese Beef production.