И. П. Прохоров The work is devoted to the study of age-related changes of the morphological composition of carcasses, as well as of the musculature growth character and intensity of carcasses of Simmental and cross-breeding bull-calves obtained by crossing of Simmental cows with bulls of Simmental Meat and Charolaise breeds. The paper contains data on the musculature growth and development character and intensity by the anatomical divisions of half-carcasses of experimental bull-calves at different growth and development periods kept under the same feeding and maintenance conditions. It was found that a high level of feeding contributed to the most complete implementation of biological characteristics of the Charolaise hybrids, namely, an ability to intensively increase muscle tissue for a long time. The Charolaise cross-breeds significantly exceeded the peers of the parent breed by weight of the most important anatomic body parts. The greatest differences were found in the absolute mass of the muscular component of the femur region (21.7%), the vertebral column (29.4%) and the general connective musculature (39.1%). The smallest intergroup differences (2.75%) were determined in the mass of the forearm musculature. Differences in the relative mass of the muscular component of anatomical sections of bull calves ’ carcasses from the compared groups were insignificant and ranged from 0.1 to 1.29%. It is shown that the greatest growth intensity is characteristic for the muscular component of the abdominal part, general binding musculature, and the smallest for the peripheral parts of carcasses. It is noted that the growth intensity of the musculature located in the proximal parts of extremities is much higher than that of the distal sections.
Научная статья 
coefficient of muscular weight growth