Балансирование рационов молодняка крупного рогатого скота по протеину за счёт небелковых азотистых веществ

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Aim. The study of the effect of the inclusion of non-protein nitrogenous substances in the diet of young bulls on the breakdown of protein in the rumen and the digestibility of nutrients in diets. Materials and Methods. In the course of the study, zootechnical, biochemical and mathematical methods of analysis were used. The obtained digital material was processed by the method of variation statistics, taking into account the Student's t-test, using the Microsoft Excel software package. Results. As a result of studying the effectiveness of using of carbamide concentrate in the amount of 10, 15, 20 and 25% as part of compound feed in the feeding of young cattle, it was found that the degree of cleavage of feed protein with the addition of carbamide concentrate in the amount of 10-30% of the feed weight was 56-63% after 4 hours of incubation, 70-75% after 6 hours and 79-84% after 24 hours. As the results of the experiment showed, in the rumen of the animals of the experimental groups, a pH shift to the neutral side by 4.1-7.8% was noted, and when 25 and 30% of the studied feed were included in the diet, the difference turned out to be significant. There was also an increase in the amount of protein nitrogen and infusoria in the rumen of young animals that consumed 10, 20 and 25% of urea concentrate as part of compound feed. In the cicatricial fluid of bulls consuming compound feed with the inclusion of urea concentrate, the protein cleavage was higher than in the control group animals consuming compound feed without urea concentrate. The digestibility of nutrients in groups of animals with 10 and 20% introduction of carbamide concentrate into the compound feed increased by 1.08-11.22 percentage points. Conclusion. The degree of cleavage of the feed protein with the addition of carbamide concentrate in an amount of 10-30% of the feed weight was 56-63% after 4 hours of incubation, 70-75% after 6 hours and 79-84% after 24 hours. The digestibility of dry matter in groups of animals with 10 and 20% introduction of urea concentrate into compound feed increased by 2.89 and 1.71 pp., fat – by 11.22 and 2.28, protein – by 10.0 and 8.23, organic matter – by 2.14 and 0.81, Nitrogen-free extractive fraction – by 4.81 and 1.08 pp., in relation to control. It also turned out to be higher than in the groups with 25 and 30% introduction of urea concentrate into feed.