Abstract
Based on a range of experiments we show the need and recommend practical way for optimization of amino acid nutrition for dairy cows. We calculated the requirements in available amino acids and the supply of these amino acids by feeding rations.
Highlights
Based on a range of experiments we show the need and recommend practical way for optimization of amino acid nutrition for dairy cows
Last 20 years of research of new feeding systems mainly focused on the problems of protein nutrition
Requirements of ruminants in protein are considered as requirements in necessary quantity of available for assimilation amino acids
Summary
Last 20 years of research of new feeding systems mainly focused on the problems of protein nutrition. The index of decay of raw protein of the feed in rumen was the basis for all these systems. Based on this index many countries developed and brought into practice progressive systems of protein nutrition of cattle with high-productivity (АRС, NRС, INRA). After the development of these systems the intensity of research significantly decreased and lots of questions stayed poorly investigated. During this period a lot of data were accumulated, which allow to improve the existing systems
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