Reproductive and Growht Performance Test of Crossbreds Beef Bulls ( 1/2 Charolais 1/4 Brahman 1/4 Native) for Beef Production Efficinecy Improvement in Thailand

Abstract

Bull reproductive performance test of Crossbred beef cattle (1/2 Charolais 1/4 Brahman 1/4 Native) using an Andrological examination parameters was performed at Kamphangsaen Campus Kasetsart University throughout the period of 5 years. By using an Andrological and Breeding hygiene parameters testing method for the Crossbred bull at the age of 6 months up to 36 months, the testing results revealed that very high correlation (R² =0.89) between scrotal circumference and growth traits in young bulls, an average of daily gain weight at preweaning age was 788.33+ 101.52 gram and the superior quality of 6 tested bull semen by using Andrological examination paprameters such as the average of conception rate and after thawing motility of frozen semen were 59.43 and 40%, respectively. All of these tested bulls could be served as superior genetic resources for further genetic merit propagation through AI method to encourage the beef production efficiency of small farms.