CONSUMPTION OF FEED, NUTRIENTS AND ENERGY BY FIRST-HEIFER COWS OF DIFFERENT GENOTYPES
The article presents the results of studying the consumption of feed, energy and nutrients by purebred animals of black-and-white breed (group I), purebred holsteins of German breeding (group II), purebred holsteins of Dutch breeding (group III), crossbreeds of ½ holsteins of German breeding x ½ black-and-white (group IV), crossbreeds - ½ holsteins of Dutch breeding x ½ black-and-white (group V). The influence of the genotype of first-calf cows on feed consumption has been established. It is characteristic that due to the minimum consumption of all types of feed, purebred first-born cows of the black-and-white breed of group 1 were inferior to peers of groups II - IV in terms of EKE consumption by 93.7-285.3 kg (1.88-5.72%), dry matter - by 111.9-336.7 kg (2.15-6.48%), crude protein - by 13.0-38.8 kg (1.82-5.44%) digestible protein - by 7.8-25.2 kg (1.61- 5.21%), crude fiber - by 34.0 -106.7 kg (2.71-8.50%).