Обмен азота в организме коров при скармливании в рационе сенажа из козлятника восточного

Abstract

The article is devoted to the actual problem of studying the digestibility and metabolism of nitrogen in the body of cows when they feed haylage from the Galega orientalis. The experiment was conducted on winter rations of feeding, on black-motley cows with a productivity of 4500–5000 kg of milk. In the experiments, the methodological principle of ‘unity of intergroup differences’ and the presence of control animals was provided, which allowed to obtain objective data and reliable conclusions based on mathematical processing. An experimental assessment of haylage from Galega orientalis and Trifolium pratense is given, the influence of crops on the digestibility and use of nitrogen is studied. It was noted that the inclusion in the ration of experienced cows of haylage from Galega orientalis dairy had a beneficial effect on the digestibility of nutrients, the use of nitrogen from feed and its exchange in animals. The results showed that the animals of the experimental group consumed more nitrogen by 35.44 g than the control group. The nitrogen balance at the end of the experiment (on the 200th day of lactation) in the control group was 1.70 g, which is 17.76 g lower compared to the experimental group. Protein digestibility was 4.0% more, crude fiber — 10.96% (P <005), fat — 14.71% (P <0.05). Nitrogen was assimilated more efficiently: 40.10% from the accepted one and 64.50% from the digested one. The similar indicators in the control group were 31.70% and 54.40%, respectively. The use of nitrogen for the formation of milk in the experimental group was 33.5% of the accepted and 53.9% of the digested, in the control group these figures were at the level of 31.0% and 53.3%. It was noted that the inclusion in the ration of cows of haylage from Galega orientalis contributed to an increase in milk productivity by 9.2%, the excretion of protein with milk — by 18.4%, the content of carotene in the blood — by 12.3%.