EXTERIOR FEATURES AND MANIFESTATION SEXUAL DIMORPHISM IN YOUNG KAZAKH BALD AND ABERDEEN-ANGUS BREEDS

Abstract

The article presents the results of research on the study of exterior and constitutional features and the manifestation of sexual demorphism in young Kazakh white-headed and Aberdeen-Angus breeds, it is noted that the increase in productive and breeding qualities of breeding stock on the farm directly depends on the level of breeding work, in particular, on the optimal method of identifying the productive potential of animals and creating optimal conditions for feeding and maintenance. The data on the constitution and the exterior of young animals are also given, their study is necessary as a knowledge of the basis on which all the features of farm animals develop, their advantages and disadvantages, which makes it possible to better understand the reasons for successes and failures in breeding animals, to clarify forecasts in the ratio of their economic and breeding values. It is determined that the development of an animal in ontogenesis is a transition from one qualitative state to another, from simple to complex. The growth, development, and level of meat productivity of animals depended on the conditions of feeding, maintenance, and breed. At the same time, there were also biological features of development. Conclusions were drawn about the significant influence of the sex of the animal on the growth of body tissues, its role as a factor in meat formation was explained by the fact that the functioning of all systems occurs under the leading action of the nervous and endocrine systems. Sex hormones played an important role in this process. It is noted that the live weight is one of the main indicators of meat productivity and is directly related to the formation of meat, and due to the genetic program of the body associated with sex, already at birth the live weight of bulls and heifers of the studied breeds differed significantly.