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 pat...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展开更多
Two nitrogen balance trials after partial deletion of dietary amino acids(AA) were conducted to investigate the ideal balance patterns of dietary digestible lysine(Lys),sulphur containing amino acid(SAA),threonine(Thr...Two nitrogen balance trials after partial deletion of dietary amino acids(AA) were conducted to investigate the ideal balance patterns of dietary digestible lysine(Lys),sulphur containing amino acid(SAA),threonine(Thr)and tryptophan(trp)for the growing(35 60kg)and finishing (60 90kg) pigs.Eighteen Yorkshire × Landrace crossbred castrates were employed for the trials.Six isoenergetic diets based on corn,soybean meal and corn gluten meal were prepared for each trial.They were basal diet(BD)with 16 1% and 14 9% crude protein(CP)for each stage,25% low CP diet(s) supplemented with all the four (positive control,PC)or with three of the four AAs to have an equal digestible AA content,except the examined one which was 25% lower than that in BD.The result showed that the ideal amino acid pattem expressed on digestible basis was Lys 100,SAA 49,Thr 72,Trp 19 for growing stage and Lys 100,SAA 34,Thr 64,Trp 23 for finishing stage of pigs.展开更多
随着养蜂业的发展以及养蜂生产水平的提高,蜜蜂饲料的使用在我国已经越来越普遍,但大多数饲料为蜂农粗略自制,导致其质量与饲喂效果千差万别。深入研究蜜蜂营养需要和蜜蜂饲料的营养价值评定显得尤为迫切。借鉴理想蛋白氨基酸模式(ideal...随着养蜂业的发展以及养蜂生产水平的提高,蜜蜂饲料的使用在我国已经越来越普遍,但大多数饲料为蜂农粗略自制,导致其质量与饲喂效果千差万别。深入研究蜜蜂营养需要和蜜蜂饲料的营养价值评定显得尤为迫切。借鉴理想蛋白氨基酸模式(ideal protein amino acid pattern,IPAAP)能够客观的评定饲料蛋白质的营养价值。本文综述了理想蛋白氨基酸模式的原理及其研究方法,并对通过IPAAP评定蜜蜂蛋白质饲料营养价值的可行性进行了分析。展开更多
文摘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
文摘Two nitrogen balance trials after partial deletion of dietary amino acids(AA) were conducted to investigate the ideal balance patterns of dietary digestible lysine(Lys),sulphur containing amino acid(SAA),threonine(Thr)and tryptophan(trp)for the growing(35 60kg)and finishing (60 90kg) pigs.Eighteen Yorkshire × Landrace crossbred castrates were employed for the trials.Six isoenergetic diets based on corn,soybean meal and corn gluten meal were prepared for each trial.They were basal diet(BD)with 16 1% and 14 9% crude protein(CP)for each stage,25% low CP diet(s) supplemented with all the four (positive control,PC)or with three of the four AAs to have an equal digestible AA content,except the examined one which was 25% lower than that in BD.The result showed that the ideal amino acid pattem expressed on digestible basis was Lys 100,SAA 49,Thr 72,Trp 19 for growing stage and Lys 100,SAA 34,Thr 64,Trp 23 for finishing stage of pigs.
文摘随着养蜂业的发展以及养蜂生产水平的提高,蜜蜂饲料的使用在我国已经越来越普遍,但大多数饲料为蜂农粗略自制,导致其质量与饲喂效果千差万别。深入研究蜜蜂营养需要和蜜蜂饲料的营养价值评定显得尤为迫切。借鉴理想蛋白氨基酸模式(ideal protein amino acid pattern,IPAAP)能够客观的评定饲料蛋白质的营养价值。本文综述了理想蛋白氨基酸模式的原理及其研究方法,并对通过IPAAP评定蜜蜂蛋白质饲料营养价值的可行性进行了分析。
