Nutritional requirement of digestible tryptophan for white-egg layers of 60 to 76 weeks of age

被引：5

作者：

Cardoso, Anilma Sampaio ^{[1
]}

Perazzo Costa, Fernando Guilherme ^{[1
]}

Vilar da Silva, Jose Humberto ^{[1
]}

Saraiva, Edilson Paes ^{[1
]}

Nogueira, Eduardo Terra ^{[2
]}

Santos, Clariana Silva ^{[1
]}

de Lima, Matheus Ramalho ^{[3
]}

Goncalves Vieira, Danilo Vargas ^{[1
]}

机构：

[1] Univ Fed Paraiba, BR-58397000 Areia, PB, Brazil

[2] Ajinomoto Anim Nutr, BR-45985188 Sao Paulo, Brazil

[3] Fed Univ South Bahia, BR-04101000 Teixeira De Freitas, BA, Brazil

来源：

JOURNAL OF APPLIED POULTRY RESEARCH | 2014年 / 23卷 / 04期

关键词：

amino acid; egg production; feed intake; performance; COMMERCIAL LAYING HENS; PERFORMANCE; ISOLEUCINE; VALINE; DIETS;

D O I：

10.3382/japr.2014-01012

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

The objective of this study was to determine the nutritional requirement of digestible Trp for white egg layers in the period from 60 to 76 wk of age. A total of 180 Dekalb White layers with an average weight of 1,345 kg were distributed in a completely randomized design with 5 increasing levels of digestible Trp (0.167, 0.175, 0.183, 0.191, and 0.199%), 6 replicates, and 6 birds per experimental unit. The diets of the treatments contained 0.759% of digestible Lys, which was obtained using the prediction equation of the Brazilian Tables for Poultry and Swine, and each treatment consisted of a digestible Trp-to-Lys ratio of 22, 23, 24, 25, or 26%. The digestible Trp levels in the diet had a quadratic effect on egg production, egg mass, and conversion per mass and per dozen eggs, and a linear effect on egg weight. In conclusion, a diet with 0.192% digestible Trp, in a 25.33% ratio with digestible Lys or 212 mg/bird per day, can be recommended for white egg layers of 60 to 76 wk of age.

引用

页码：729 / 734

页数：6

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