Влияние добавок селена и цинка в комплексе с метионином на элементный состав крови, мясную продуктивность и качество мяса бычков абердин-ангусской породы с выявленным дисбалансом селена и цинка в организме

The studies were carried out on Aberdeen- Angus bulls with Zn and Se deficiency in blood serum. In experimental Group I, animal basic diets were supplemented with organic forms of Zn and Se. In experimental Group II, similar doses of Zn and Se were complemented with methionine (Zn+Se+Met complex). The control group received no supplements to the basic diet. The duration of experimental feeding was 90 days. At the end of the experiment, an analysis of the element profiles of blood serum in Group I showed a significant increase in the levels of Zn and Se but a decrease in the levels of Mn, Cu and Fe. Group II showed an increased concentration of all these elements along with a decrease in the level of malondialdehyde and an increase in the levels of superoxide dismutase and catalase activity in blood serum. In terms of average daily gains, bulls in Groups I and II outperformed the animals in the control group by 5.9 (P≤0.05) and 8.4 % (P≤0.05), respectively. The bulls in the control group were inferior to the animals in the experimental groups in terms of pre-slaughter live weight, weight of hot and chilled carcasses, weight of flesh and bones in carcasses; the maximum difference was observed between the control animals and the ones receiving Zn+Se+Met complex. The element profiles of the longissimus dorsi muscle changed in proportion to the changes in the elemental composition of the blood serum. The supplements improved the nutritional quality of the longissimus dorsi muscle. It manifested itself in a significant increase in the concentrations of amino acids (arginine, phenylalanine, methionine, valine, alanine, glycine, tryptophan) and polyunsaturated fatty acids along with a decrease in the concentrations of saturated fatty acids