Abstract
True amino acid digestibility and protein utilization of oat and annual meadow grass LPC (LPC B), ladino clover LPC (LPC C) and soybean protein were determined using colostomized cockerels as the experimental animals. Since the diets used here were deficient in some amino acids, 0.14% arginine, 0.30% arginine+0.03% methionine and 0.07% methionine were supplemented to the LPC B, LPC C and soybean protein diets, respectively. The mean of true digestibility of total amino acids of arginine supplemented LPC B (90%) was significantly (P<0.05) higher than that of arginine and methionine supplemented LPC C (87%) and lower than that of methionine supplemented soybean protein(97%), and amino acid supplementation to the LPCs improved the digestibility. True protein digestibility was also improved by amino acid supplementation (from 72% to 84% in LPC B and from 69% to 81% in LPC C), but they were still lower than that of methionine supplemented soybean protein (95%). There was no significant difference in biological value between LPCs and soybean protein when these proteins were supplemented with deficient amino acids.
