The influence of biologically active feed additives of animal origin on the productive qualities of cattle
The research aimed to study different options for sagination with the inclusion of a feed additive consisting of chlorella and crab meal, to determine the effect of biologically active feed additives of animal origin on the productive qualities of cattle. The work was carried out in 2020 in the Stavropol Territory. For the study, three groups of peer bulls of the Kazakh white-headed breed were formed at the age of 12 months, 15 heads each. Animals in the first control group received the main diet, which consisted of alfalfa hay (5 kg), cereal turf (4 kg), winter wheat straw (2 kg), fine salt (50 g). Bulls of the second experimental group were introduced into the diet 0.1 kg/head of crab meal feed additive. The third experimental group received the same dose of crab meal additives (97%) and dry weight of chlorella (3%). The dynamics of the bull live weight was tracked using monthly control weighings. The inclusion of a feed additive consisting of crab meal and chlorella contributed to an intensification of metabolic processes, an increase in the content of erythrocytes in the blood by 20.5-21.8% and the level of hemoglobin by 5.0-10.5%. In the blood of the animals of the third experimental group, the total protein content increased. This was primarily due to an increase in the number of albumins, in comparison with the 1st control and 2nd experimental groups, by 39.5 (p<0.02) and 23.9%, Y-globulins - by 27.9 (p<0, 02) and 23.9%. As a result, the live weight of the individuals that consumed the additive from crab meal and chlorella was 20.4 kg (4.7%) more than in the first group, by 13.4 kg (3.0%) compared to the second experimental group, according to the average daily increase - by 130.0 and 109.0 g, or by 12.8 and 10.5% and, as a result, the profitability of production by 2.9 and 1.7%.