Intercorrelation of Cow Length Pregnancy, Birth Weight and Sex Ratio Of Calves In Madura Cattle

Abstract

Optimization of beef cattle breeding is a systematic effort to improve productivity and population. The aim of this study is to determine the birth weight and sex ratio of calves and its association with length of pregnancy estrus synchronization program. The research was conducted in Pamekasan district, Madura Island, including three sub-districts; i.e.: Waru, Batumarmar and Pasean from July 2012 until August 2013. The total of 80 cows and their calves were divided into three treatment based on the dose and the type of hormone. The average of length pregnancy of Madura cattle was 287.49 days. For the birth weight in all treatments ranged between 16-20 kg, with an average of 18 kg. Length of pregnancy positively correlated to birth weight and sex of calves with correlation (r) 0.213 and 0.051, respectively. Based on Spearman correlation test, there was not significantly between birth weight and sex ratio of calves in Madura cattle.