Meat productivity and quality of beef obtained from black-and-white bulls and its crossbreeds with aberdeen angus

At birth, the live weight of the bulls of the control group significantly exceeded their herd mates of the experimental group by 6.26 kg (20 %). A significant superiority of crossbred young animals was revealed from the birth to 6 months, in terms of growth intensity (by 143.83 g or 16.9 %), and by live weight, respectively, by 20.06 kg or 10.41 %. The difference in live weight was 35.33 kg (7.1 %): 498.00 in the control group and 533.33 in the experimental group before the slaughter at the age of 18 months. According to the results of the control slaughter the advantage of the bulls of the experimental group in carcass weight by 32.11 kg (13.8 %), slaughter weight (by 19.3 %) and slaughter yield by 2.5 % was observed. The water content in the meat of black-and-white bulls was higher by 6.1 % in the average sample and by 0.4 % in muscle tissue, respectively. The meat of the bulls of the experimental group contained more ash compared to the samples of meat obtained from crossbred animals - by 1.2 % and 19.5 %, respectively. According to the mass fraction of carbohydrates in the average sample and in the muscle tissue of the longest back muscle there were no significant differences between the groups, and the difference varied from 15.8 to 17.9 %. There were no significant differences in protein content in meat of different bull origin, and the difference varied from 0.7 to 2.7 %. In the average sample the fat content was almost 2 times higher in meat of crossbred bulls (97.1%) and 89.1 % higher in muscle tissue compared to herd mates of the control group.