“…Therefore, much research has been conducted to evaluate nutritive value of amino acids for microorganisms in the rumen as well as for the host animal. For example, amino acid intake, digestion, and absorption has been studied in sheep consuming a variety of diets under pen (Coelho et al, 1972;Harrison et al, 1973;Hogan, 1973) and free-grazing (McMeniman et al, 1986) conditions. On the other hand, knowledge of amino acid composition in feeds was limited only to cereal grains and temperate legumes (alfalfa) used in poultry and swine production.…”