The scientific investigations were conducted in the Stavropol krai in 2024 to study the effects of carbamide in the lipid membrane on performance of the North-Caucasian meat-and-wool ram lambs in the fattening period. The experiment involved the 127-day-old lambs divided into three groups of 15 animals each. The lambs in the control group received the basic ration (BR) containing Sudan grass hay, compound feeds, beet molasses, and mineral supplements. The animals in test groups 2 and 3 were supplied with BR modified by replacing a part of the pea component in the compound feeds for the “Nitrocote” feed additive at the 1.1 and 1.6% inclusion rates of the total weight of the compound feed ingredients, respectively. Performance of ram lambs was recorded till they reached the age of 7 months. The crude protein content in the rations for the test-group animals increased relative to the control by 9.1 and 13.1%, respectively, while the digestible protein content increased by 12.1 and 18.0%, respectively. The blood parameter values for the ram lambs fed the BR supplied with the feed additive at the 1.1 and 1.6% inclusion rates were higher in the lambs reaching 7 months of age by 7.3 and 11.5%, 4.9 and 6.5%, 12.5 and 14.5%, and 18.6 and 35.3% for the blood hemoglobin contents, erythrocytes total protein, and albumin fractions, respectively, when compared to that for the control-group animals. The feed additive included into the ration for the test-group lambs contribute to increasing the lamb live weight, average daily gain, slaughter weight, slaughter yield, meatiness coefficient, and feed-conversion efficiency by 3.6 and 6.2%, 11.1 and 19.1%, 6.7 and 11.8%, 1.24 and 2.12%, 0.07 units and 0.33 units, and 10.3 and 15.1%, respectively. The “Nitrocote” feed additive used (at the 1.1% and 1.6% inclusion rates) in the compound feed composition for fattening rams allowed us to make additional profit of 4.29 RUB and 5.52 RUB per 1 RUB of costs.
Marynich et al. (Fri,) studied this question.