EXPERIMENTAL FOUNDATION OF NEW CONCEPTS OF BALANCING THE NEEDS OF ESSENTIAL AMINO ACIDS IN THE DIETS OF HIGH- PERFORMANCE DAIRY COWS

New principles of balancing the needs of essential amino acids for highly productive cows based on the fact that if milk yields are up to 20 kg of milk microbial protein provides all essential amino acids need, and at higher productivity calculated revenues only lysine and methionine in the composition of non-degradable protein mostly high-protein feed that comes from proventriculus to the small intestine for a given level of milk synthesis, because other essential amino acids are not critical at high their fermentation in the rumen.