Meat productivity and quality of beef are determined by a number of factors, including pedigree traits of animals. Meat productivity is closely related to the biological patterns of their growth and development. Considering the patterns that affect meat productivity enables effective growing and fattening of livestock and obtaining commercially viable beef. To predict economically useful traits in beef cattle breeding, interior indicators can be used, as they reflect the metabolic picture of the animal’s body. The research studies in physiology and biochemistry of livestock aimed at revealing the persistent mechanisms of a growing animal organism make them relevant. The article identifies a correlation between the interior indicators and the fattening indicators of three experimental groups of steers. The main forecasting factors of meat productivity indicators have been substantiated. Regression coefficients have been found and show how much the live weight varies depending on the determining factors. Meat productivity predicting procedures have been modeled with respect to the protein content in blood serum.

One of the key factors ensuring the increase in sheep production in future is the development of intensive reproduction of the herd. The article presents the results of an experiment that helped study and give comparative characteristics for the meat productivity and natural resistance of the pedigree Edilbay sheep breed in conditions of a pedigree reproducer in 2018-2019. The young stocks of original and new types were studied to assess their interior traits, establish the direction and degree of correlation between the biochemical blood parameters and meat productivity of young sheep, as well as determine indices reflecting the immune status of organisms of the experimental sheep. When starting the test, the live weight of animals of the pure and pedigree types were almost the same, while when finishing the experiment at the age of 12 months, animals in Group II exceeded animals in Group I by 4.3 kg (5.8%, P<0.01). The best average daily gain of experimental sheep was also in Group II, i.e., 167 g, which was higher than in Group I by 9.1% (P<0.01). Consequently, the rams of new type had the highest growth rate. The data of the control slaughter showed that both experimental groups had high meat productivity. The analysis of natural resistance indicators of small ruminants of various types and their relationship with productive qualities in different climatic zones have also shown the need to use different integral indicators to assess the immune status in further breeding of animals. The analysis of natural resistance indicators of small ruminants of various types and their relation with productive qualities in different climatic zones has suggested that there is a need to use several markers to assess the immune status for further sheep breeding.

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