Estimates for digestible threonine: lysine for 21 - 35-day-old female meat-type quails

Q4 Agricultural and Biological Sciences

Revista Brasileira de Saude e Producao Animal Pub Date : 2020-01-01 DOI:10.1590/s1519-99402121292020

M. Castro, S. Pinheiro, F. Dalólio, H. J. D. Lima, L. Abreu, R. Oliveira, L. Mota, Débora Cristine de Oliveira Carvalho

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引用次数: 1

Abstract

ABSTRACT Two assays were performed to estimate digestible threonine-lysine (Threo-Lys) ratio for female meat-type quails between 21 and 28 days old and between 28 and 35 days old. Experimental design was totally randomized. The first assay comprised 440 quails distributed into 5 treatments, 8 replications and 11 fowls per cage. The second assay comprised 280 quails distributed into 5 treatments, 8 replications and 7 fowls per cage. Five digestible Threo: Lys ratios were evaluated (0.66, 0.71, 0.76, 0.81 and 0.86). Performance, carcass and cut yield, chemical composition of carcass and nitrogen balance were evaluated. There was an improvement (P<0.05) in feed conversion and increase in feed intake due to ratios of digestible Threo: Lys between 21 and 28 and between 29 and 35 days olds, respectively. At 35 days old, there was a better (P<0.05) carcass yield and a negative nitrogen balance for Threo: Lys analyzed. A ratio of 0.86 may be recommended for digestible Threo: Lys as the best for feed conversion and carcass yield for female meat-type quails between 21 and 28 and between 28 and 35 days.

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估计21 - 35日龄雌性肉型鹌鹑可消化苏氨酸:赖氨酸

摘要采用两种方法测定21 ~ 28日龄和28 ~ 35日龄雌性肉型鹌鹑的可消化苏氨酸-赖氨酸(Threo-Lys)比率。实验设计完全随机化。第一次试验将440只鹌鹑分为5个处理，8个重复，每个笼11只鸡。第二组试验选用280只鹌鹑，分为5个处理，8个重复，每个笼7只鸡。测定5个可消化赖氨酸∶赖氨酸比率(0.66、0.71、0.76、0.81和0.86)。对肉鸡的生产性能、胴体和切肉产量、胴体化学成分和氮平衡进行了评价。21 ~ 28日龄和29 ~ 35日龄可消化赖氨酸∶赖氨酸比率分别提高了饲粮的饲料转化率和采食量(P<0.05)。35日龄时，三赖鸡的胴体产量和负氮平衡较好(P<0.05)。21 ~ 28日龄和28 ~ 35日龄雌肉型鹌鹑的饲料转化率和胴体产量最佳时，推荐可消化赖氨酸比例为0.86。

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