Kruk O. Assessment of meat efficiency of bulls depending on the gain of live weight and age of slaughter

The thesis presents the results of research on the performance evaluation of meat and dairy bull beef cattle slaughter, depending on age and weight parameters of growth. Conducted a survey of over 2014-2016 years at the Farm "Zhuravushka" Kyiv region, of "Agrikor - Holding" Chernihiv region. We also used the results obtained in breeding factory "Volia" in Cherkasy region and highlighted in the "Catalog in breed types of beef cattle" (K: Urozhay, 1988). In the course of research, it was discovered that the quantitative and qualitative features of bull beef productivity are affected by the weight increase and slaughter age. The slaughter yield tends to a slight increase with age of beef and dairy breeds rather the Aberdeen angus breed tends to some decrease on that parameter. Its smallest size (44,7-46,1 %) observed in animal Ukrainian black and white dairy cattle. The largest (59,7-62,7 %) yield of carcasses was in Ukrainian meat breed bulls. Net increase bull all studied breed decreased with increasing age. This is due to a decrease in the intensity of the growth of animals and no significant changes slaughter yield with age. The growth rate of bulls from birth to slaughter more impact on their net gain and carcass yield than live weight. Net increase in all groups of animals by increasing the average daily growth tends to increase.