Biochemical composition of blood and productivity of cattle of the Kalmyk breed

The aim of the research was to study the biochemical composition of the blood serum of Kalmyk breed animals and to identify the desired level of the content of transamination enzymes. The results of the analysis showed that a reliable correlation between AST, ALT, total protein level and live weight can serve as markers of productivity. In general, according to experience, a profitability of at least 44 % was obtained. The obtained results clearly prove the need to widely use indicators of the activity level of transamination enzymes, since the cultivation of animals with a higher level of ALT and AST is more cost-effective than those with a lower indicator.