STANDARDIZED ILEAL DIGESTIBLE TRYPTOPHAN TO LYSINE RATIOS IN GROWING PIGS FED U.S. TYPE AND NON U.S. TYPE FEEDSTUFFS

摘要: OF THESIS STANDARDIZED ILEAL DIGESTIBLE TRYPTOPHAN TO LYSINE RATIOS IN GROWING PIGS FED U.S.–TYPE AND NON–U.S.–TYPE FEEDSTUFFS The objective of these studies was to determine the optimum standardized ileal digestible tryptophan lysine (SID Trp:Lys) ratio for growing pigs fed both U.S.–type (corn–soybean meal) and non–U.S.–type (wheat–barley) diets. When feeding diets, average daily gain (ADG) plasma urea nitrogen (PUN) concentrations improved as SID Trp:Lys ratios increased, yielding 15.32% (P<0.001) 15.25% (P<0.001), respectively. Averaging resulted in an 15.29%. In increasing ADG PUN, displaying optima 15.99% (P=0.048) 15.29% (P=0.054), This produced 15.64%. final study included other dietary essential amino acids (EAA) at a higher level, PUN 17.93% 16.17% (P=0.009). averaged 17.05%. Overall, diet composition did not affect requirement pigs, however, EAA levels estimated ratio. is lie between 17.05%