Effect of the level of digestible lysine and the ideal amino acid profile on the lysine requirement in Hy-Line W-36 hens at the end of the first laying cycle

Angeles, M. de L.; Gomez Rosales, S.

Veterinaria Mexico 36(3): 279-294

2005


ISSN/ISBN: 0301-5092
Accession: 004128544

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Abstract
The objective of the study was to evaluate the effect of digestible lysine level and the addition of crystalline amino acids on productivity, nitrogen utilization and lysine requirement of Hy-Line W-36 layers from 60 to 65 weeks of age. In Exp. 1, four increasing levels of lysine were tested in diets based on sorghum and soyabean paste at 0.40, 0.53, 0.66, and 0.79%. There were 6 replicates per treatment with 2 hens each. In Exp. 2, previously used diets containing 0.66 and 0.79% of lysine were tested and crystalline amino acids were added to match or surpass the 10% ideal amino acid profile. There were 5 treatments with 6 replicates with two hens each. The experiments lasted for 21 days, and in the last 5 days, nitrogen balance was observed. In both experiments, productivity was increased (Exp. 1, P<0.01; Exp. 2, P<0.05) as the level of dietary lysine increased. In Exp. 1, the lysine requirement/g of egg mass decreased (P<0.01) as the level of digestible lysine in the diet increased. In Exp. 2, the amino acid profile did not affect any of the parameters evaluated. It is concluded that Hy-Line W-36 hens have an estimated requirement of 12.96 mg digestible lysine/g of egg mass and this requirement is not affected by the ideal amino acid profile.