Abstract
True amino acid availabilities were determined in 19 feed ingredients (cereal grains, oil-seed meals, animal proteins and brans) using the true metabolizable energy assay.
Average true amino acid availability values of cereal grains ranged from 92 in corn to 74% in naked barley. Those of oilseed meals ranged from 92 in soybean meal to 35% in sesame seed meal. Those of animal proteins ranged from 94 in white fish meal to 69% in meat and bone meal. Those of dehydrated alfalfa meal, wheat bran and defatted rice bran were found 70, 76 and 70% respectively.
There were consistent differences in availability among essential amino acids in feed in-gredients originated from plant. Generally histidine, arginine, leucine and phenylalanine were among the most available amino acids, while lysine, threonine and isoleucine were among the least available amino acids in those protein. On the other hand, in animal proteins, isoleucine, lysine and threonine were found relatively high in availability.
