Аңдатпа
This article presents the results of improvement of existing methods for assessing Kazakh white-headed breed bull-calves when testing them for their productivity using GrowSafe technology and the influence of part typical factors by daily weighing of the set feeds and growth and determining the effect of residual feed consumption (RFI) on the growth and development of breeding bull-calves. The study showed that the assessment of the amount of residual feed consumption increases the objectivity of the assessment of livestock productivity, i.e. the amount of feed consumed in all OPK farms - from 2.34 to + deviated to +1.97, showed equally good indicators, and the amount of uneaten feed (RFR) in bulls was 54% negative (RFR) and 46% positive (RFR).This indicates that bulls consume less feed during the test for higher performance. Among the bulls tested in four farms, the highest daily gain was also noted in Zhana Bereke LLP, which averaged 1776 grams. The share of succulent feed in this diet in this farm was 66.4%, large feed - 11.2% and compound feed - 22.3%.