Formation of meat productivity in descendants of Kalmyk breed improver bulls

Abstract

The article analyzes the results of assessing by scoring and index methods the quality of the offspring of five Kalmyk breed bulls and their sons in terms of their own productivity and the formation of their carcass morphological composition. For this purpose, 10 sons of bulls Prometheus 1127, Grilyazh 916, Gomat DRZh-59223, Yago DRZh-39023 and Raskat 8692 were selected from the Solnechnoe Breeding Plant LLC, Oryol district, Rostov region. The sons of the evaluated stud bulls up to 8 months of age were raised on full suction with mothers, and from 8 to 15 months of age were kept in the same group under equal conditions and over a 7-month period, on average, feed was consumed per bull, containing 1569 feed units, 168 kg of digestible protein, 2032 kg of dry matter with exchange energy 15663 MJ. With this level of feeding, all the controlled sires and almost all of their sons, according to the score, met the requirements of the elite-record grading class. However, according to the results of the index assessment, only the bulls Prometheus 1127 and Grill-yazh 916 met the requirements of the improver category, and the remaining three bulls met the requirements of the neutral category. The descendants of the leading bulls with a preslaughter live weight of 412.1 and 419.9 kg exceeded peers of other groups in carcass weight by 8.5-14.1 kg, in muscle tissue weight by 9.4-15.4 kg, but by 3-5% less yield of fat, bones, cartilage and tendons and the highest meat ratio.