Feed nitrogenous substances undergo significant changes in the rumen of ruminants. Along with the processes of digestion of feed protein and non-protein nitrogen compounds, synthesis of microbial protein takes place in the rumen, which is used by the host animal to form its own proteins, milk and wool. Microbial protein largely covers the need for amino acids in ruminants. And as the rumen micro-organisms synthesize all essential amino acids during protein production, the quality of feed protein and its biological value do not have such importance in ruminants as in monogastric animals and poultry.
However, due to the increasing intensification of productivity, the requirements to the amino acid composition increase.
Methionine, lysine, and threonine are the limiting amino acids for the growing young animals. In lactating cows, the need for amino acids is associated primarily with the levels of their productivity. Thus, methionine and isoleucine become the limiting amino acids in cows with a productivity of 15 kg of milk per day, while they are histidine and valine at more than 20 kg per day, and lysine at more than 30 kg.
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