MEAT PRODUCTIVITY OF BLACK-AND-WHITE BULL-CALVES UNDER DIFFERENT TECHNOLOGIES OF THEIR BREEDING IN THE PREWEANING PERIOD
The article presents data on the study of comparative rearing of black-and-white bulls with different levels of feeding during the preweaning period. The bulls of the first group received a traditional diet for the farm and from the first days of birth consumed 5-7 kg of colostrum, and then milk, and from the age of 5 days - 2-4 kg of CMR. At the same time, they were gradually accustomed to eating rough and concentrated feeds. As a result, in the first month of life, they consumed 180 kg of milk, 80 kg of CMR and 1 kg of pre-starter compound feed. The bulls of the second group had an increased feeding pattern and consumed 6-9 kg of colostrum, and then milk, and from the age of 5 days - 6-8 kg of CMR. From the age of 10 days, they consumed 0.1-0.2 kg of sifted oatmeal and 0.1 kg of pre-starter feed and hay. Therefore, in a month they consumed 250 kg of milk, 175 kg of CMR, 3 kg of oatmeal and pre-starter feed and 2 kg of hay. The bulls of the first group received dairy products for 77days, and the second - for 61 days, but during this period and thereafter they received rough and succulent feed. During the 6 months of the reference preweaning period, the first group consumed 50 kg more whole milk, but 2.5 times less silage, 2 times less root crops and 1.1 times less mixed feed. From the first month to the end of the experiment the first group with increased consumption of colostrum, milk and other feeds had 20-200 gr more daily weight gain and for 6 months had 20 kg more pure gain and live weight.