The constant demand for high quality dairy products has driven significant changes in the productive capacity of dairy cows in the last 50 years. To maintain high volumes of milk production and quality in terms of the level of protein, fat, and other milk components, it is common to use high levels of crude protein in the diet. However, this practice generates N residues in feces and urine that cause environmental pollution and high costs. Balancing diets to cover metabolizable protein and limiting amino acid requirements allows feeding low-protein diets resulting in higher N utilization efficiency, lower environmental impact, and higher profitability. Lysine, methionine, and histidine are the most limiting amino acids in diets for dairy cows based on corn silage and alfalfa hay. The use of rumen-protected lysine and methionine in transition cow diets positively affects dry matter intake, milk production and milk quality. Whereas supplementation with rumen-protected methionine to cows prior to calving improves metabolic immune status and genetic expression of offspring, which show better productive performance after birth.
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