Metabolic status of the organism of bulls-producers of different genotypes
We studied the biochemical status of the organism of Holstein (n=8) and Simmental (n=8) bulls-producers in a comparative aspect. Samples of blood serum of bulls-producers contained in the conditions of the Moscow region were analyzed. Indicators of nitrogen, carbohydrate-lipid, mineral metabolism, and enzyme activity were determined in the blood samples. The content of total protein and its fractions, urea, as well as the ratio of albumins and globulins were approximately at the same level, regardless of the genotype of animals. In the blood of Simmental bulls, compared with analogues of the Holstein breed, the concentration of creatinine was higher by 19.9% (P<0.05), the level of phospholipids - by 16%, and cholesterol - by 46.5% (P<0.05). The concentration of phosphorus in the blood serum of Simmental bulls was 2.52 mmol/l, which is 30.5% higher than in Holsteins bulls (P<0.05). The ratio of calcium to phosphorus in the body of Simmental bulls was 1.04 against 1.40 units. in the Holstein bulls. The obtained data indicate differences in the nitrogen, carbohydrate-lipid and mineral metabolism in the body of animals of meat-and-milk and dairy productivity and will help in the reference values of blood biochemical indicators development for assessing the health and nutrition level of bulls-producers of the studied breeds