Characteristics of heifers and first calving cows of various breeds in Polissya and Forest-steppe Zhitomir region

A. S. Revunets

The reproduction of cattle of four breeds in 5 farms-reproductors and breeding factories of Polissya and Forest-Steppe of Zhitomir area were investigated The dependence was not determined between age of the first calving in 32,6±5,1 months and hatchability of 5156 kg for 305 days of lactation of the first-calving cows of Ukrainian dairy black-motley and Simmental breed - 29,5±8,1 month and 5390 kg of milk correspondingly with the service-period 137,8±7,8 and 99,2±1,6 days, an index of fertilization 2,1±1,5 and 2,0±2,5.

Download full text in PDF format