WEIGHT GROWTH OF DAUGHTERS OF HOLSTEIN BREED BULLS

Abstract

The main task in herd reproduction is to obtain a viable calf from each cow every year. One of the ways to increase the productivity of a dairy herd is to introduce animals with high productivity potential and good health into the herd, which in turn depends on the organization of targeted breeding of repair young animals. As a result of the conducted studies, it was found that with the age of heifers, their live weight increases, reaching maximum values at the age of 18 months, 448.8 - 482.8 kg. The heifers, the daughters of the producer bull Alabi 3128792975, grew best of all. In all assessment periods, they surpassed their peers from other bulls: Frampton 3147277570 and Musket 165. According to the average daily weight gain, the daughters of the Alabi bull 3128792975 turned out to be the best, who, on average, exceeded the daughters of the Frampton bull 3147277570 by 64 g or by 7.6% (P<0.05) and the daughters of the Musket bull 165 by 19 g or by 2.2% over the entire growing period. The daughters of Frampton Bull 3147277570 grew up in all periods in approximately the same way. The lowest gains were recorded from birth to the age of 6 months - 727 g, the highest in the period from 12 to 18 months of age – 813 g. The daughters of Musket bull 165 have established a growth rhythm by growth periods.  The daughters of the Alabi bull 3128792975 have a gradual increase in average daily gains from birth to 10 months, and their stabilization until the end of cultivation.