Effect of genotype on the development pattern of muscles and muscle groups in steers at the age of 18 months

Abstract

Abstract The development patterns of carcass muscles were studied on Simmental and Black-Spotted steers and their hybrids of the 1st generation. At the age of 18 months, a control slaughter of 3 steers of different genotypes was carried out: Group I - purebred Simmental steers; Group II - hybrids of ½ Simmentals x ½ Red Steppe steers; Group III - hybrids of ½ Simmentals x ½ Black-Spotted steers. To study the muscle groups and individual muscles development according to anatomical regions, the left half-carcasses were prepared, taking into account the methodological instructions, and to facilitate the analysis of the material, the muscles were grouped according to the joints associated with them and the topographic location, using the generally accepted scheme. The muscles development was studied on the basis of the absolute mass indices of individual muscles and muscle groups. It was established that steers of Group III had the following advantages over the animals of the same age in Groups I and II: in the total muscle mass of the spinal column the advantage was 217-772 g (1.43 - 18.30%), in the total muscle mass of the shoulder girdle - 1.45-0.51 kg (9.78-3.51 %), the thoracic limb - 231-660g (14.37-41.04%), the pelvic limb - 3.16-1.11 kg (9.78-3.45%) and in general for the entire half-carcass of the recorded muscles - 6.62-2.33 kg (9.79-3.44 %).