Division of Dairy Cattle Breeding, National Dairy Research Institute, Karnal - 132 001, India.
1Zonal Agr. Res. Stn. IGKVV, Jagdalpur-494001, India.
Based on 4440 calving records, the frequency of male births (sex-ratio) was observed to be 0.516 which was significantly higher than that of the female births. However, the frequency of male births did not differ significantly among diffetent genetic groups, period, season and parity of calving. The frequency of male births among the progeny of different sires did not differ significantly. The heritability and repeatability estimates were found to be very low.
