Estimation of Genotypic and Phenotypic Parameters of Reproductive Traits in Turkish Holstein Cows

Abstract

In this study, reproductive parameters of Holstein Friesian cows raised at Koçaş State Farm were investigated. Average, first breeding age, first calving age, calving interval, number of insemination per gestation and service period were found as, 529,66, 849,59, 378,61 d, 1,92 times and 105,67 d respectively. Also, estimated heritability values of same traits were as 0,30, 0,20, 0,02, 0,09 and 0,11 respectively. The effects of year, season and lactation number on services insemination per pregnancy; the effects of year on calving interval and first breeding age were found significantly. In conclusion, data of reproductive traits of Holstein Friesian cows in raised Koçaş State Farm herd were determined well condition and the estimated phenotypic and genotypic parameters are within reasonable limits.