不同氨基酸平衡模式对生长猪氮代谢的影响

THE EFFECT OF IDEAL AMINO ACID PATTERNS ON THE NITROGEN UTILIZATION OF GROWING PIGS

Twenty Yorkshire × Landrace crossbred castrates(YL)with bodyweight of 47 73±1 85kg were used to conduct a nitrogen(N) banlance trial to compare the quality of four digestible amino acid patterns.The four patterns were from NRC(1998)(A),Wang,J.M.(1998)(B),Wang&Fuller(1990)(C)and Japan(1993)(D).The balance ratios of digestible lysine(DLys),sulphur containing amino acid(D SAA),threonine (DThr)and tryptophan(DTrp)for A,B,C,D were 100∶57∶60∶17;100∶49∶72∶19;100∶61∶64∶20;100∶51∶60∶15 respectively.Pig performance in terms of daily gain and feed conversion rate,N digestibility and N retention were highest in C. B had highest N net utilization and lowest serum urea N content while D was the poorest in the examined criteria.Ranking analysis by SAS gave the priority order of C,B,A,D.Pattern C is recommended for growing

Twenty Yorkshire × Landrace crossbred castrates(YL)with bodyweight of 47 73±1 85kg were used to conduct a nitrogen(N) banlance trial to compare the quality of four digestible amino acid patterns.The four patterns were from NRC(1998)(A),Wang,J.M.(1998)(B),Wang&Fuller(1990)(C)and Japan(1993)(D).The balance ratios of digestible lysine(DLys),sulphur containing amino acid(D SAA),threonine (DThr)and tryptophan(DTrp)for A,B,C,D were 100∶57∶60∶17;100∶49∶72∶19;100∶61∶64∶20;100∶51∶60∶15 respectively.Pig performance in terms of daily gain and feed conversion rate,N digestibility and N retention were highest in C. B had highest N net utilization and lowest serum urea N content while D was the poorest in the examined criteria.Ranking analysis by SAS gave the priority order of C,B,A,D.Pattern C is recommended for growing pigs