INFLUENCE OF BULL-CALVES FATTENING ON BEEF PRODUCTION EFFICIENCY
The aim of research was to evaluate the efficiency of growing steers by the "cow-calf" in the resource-saving technologies in beef production and the realization of their slaughtered at different ages. The object of study -Hereford bulls Australian selection. Implementation of calves for meat in the first experimental group occurred in 16 months of age, the second - in 20, and the third - in the 24-month ages. In the study covered in indicators of growth and development of animals and meat productivity economic efficiency of beef production. It was found that the above figures largely determines the duration of experimental fattening calves and slaughter age extension to 24 months is somewhat reduced. Since output carcass at slaughter at 24 months of age is reduced by 2.5% and 3.1% compared to steers implemented on meat at the age of 16 and 20 months, increasing the output of internal crude fat 0.84%, and 0.88%, respectively. The highest rate of slaughter yield was set at slaughter at 20 months of age - 62.4% compared to the 1st and 3rd groups - 61.3% and 59.7%. In general, similar data were obtained and output naturally anatomical cuts carcasses. However, when assessing the cost-effectiveness showed that despite an increase in the share of material costs from 44% to 50% and other costs - from 20% to 28% of revenues from sales of meat 20-month bulls increased as compared to the 16-month on 19.2% and 24-month - 32%. The increase in the cost of 1 kg of live weight gain is largely offset by a decrease of their organization and the content reproduction calves breeding stock herds. At the same time revenue from sales growth outpaced expenses by 1.3 times, and the total weight gain, taking into account the subsequent calving mothers of these calves raised for a duration of fattening up to 20 months compared with 16 months in 1.6 times up to 24 months - 2 times. Thus, from an economic point of view, it is the most appropriate slaughter steers for meat at the age of at least 20 months.