Abstract
The use of new sources of by-pass protein in the cow diets to optimize milk production and herd reproduction performance indicators in modern economic conditions is relevant. The article presents data on the use of a protein concentrate containing plant and animal components and its effect on the quality of the milk obtained, the state of the rumen bacterial community and reproduction indicators. The use of protein concentrate of both 1.0 kg and 1.5 kg/head/day contributed to improving the quality and increasing the yield of dry matter of cow's milk by 0.17-0.43 %. During the days in milk, with the use of protein concentrate it was observed that increase the content of Selenomonas by 1.7 % and 4.1%, which cleave the urea, indicates a more efficient use of nitrogen in the diet. The inclusion of protein concentrate in the composition of daily diets helps to improve reproduction indicators, reduce the duration of the service period and the number of semen doses spent.
Highlights
High-protein feed, protein concentrates and supplements make up the most expensive part of the diet, and the optimization of nitrogen metabolism leads to lower costs for milk production and an improvement in the environmental situation [3, 5,6,7, 14, 15]
Russia meets its need for fish meal at the expense of its own production only by 12 %, and the rest is imported from abroad
There has been a stagnation in the production of fish meal, which is the lowest level in the last 40 years [3, 13, 14]
Summary
High-protein feed, protein concentrates and supplements make up the most expensive part of the diet, and the optimization of nitrogen metabolism leads to lower costs for milk production and an improvement in the environmental situation [3, 5,6,7, 14, 15]. In the experimental groups with protein concentrate, the level of metabolic energy in the diets of experimental animals was at the same level [2, 8, 9].
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