LIVE WEIGHT GAIN OF DAUGHTERS OF RED-MOTTLED HOLSTEIN BULLS BEING THE PAYMENT OF THE FODDER COST AND THE ANIMALS GROWTH EXPENSES
The purpose of the study is to study the growth and payment of feed by the increase in live weight of heifers - daughters of different manufacturing bulls of the Holstein breed of the red-and-white suit at different ages in the conditions of the modern industrial complex. Object of study: the daughter of bulls of the red-motley Holstein Cracker 45021 breed and Knor 45026 of the line V.B. Ideal 1013415, Trapper 4033 and Shuf 5771400 line Montvik Chiftain 95679. It was established that Cracker 45021 daughters surpassed live weight of their peers from Trapper Bulls 4033 and Shuf 5771400 line Montvik Chiftain by 8 (P>0.99) and 16 (P>0.999) kg, respectively, at one-year-old - by 17 (P>0.999) and 20 (P>0.999) kg and by the age of first insemination - by 18 (P>0.999) and 23 (P>0.999) kg. It should be noted that the daughters of the bull Knor 45026 at all ages approached by the obtained values of body weight to the indicators of the peers of the bull Cracker 45021. The average daily weight gains of the daughters of the bulls of the line VB During the dairy cultivation period, the average number of 1013415 was 685-813 g versus 656-736 g - in individuals of the Montvik Chiftain line 95679, which confirms their superiority in growth rate. Over the entire growing period, the average daily weight gains were highest for Cracker 45021 daughters, whose superiority over their peers from other bulls was 23-38 g. For an 18-month growing period, feed costs for Cracker bull daughters 45021 were 0.22-0.35 energy feed units and 24.2-37.2 g of digestible protein are lower than from the descendants of other bulls