Estimating requirements for apparent faecal and standardised ileal digestible amino acids in laying hens by a metaanalysis approach
2015
Krimpen, van, M.M. | Veldkamp, T. | Riel, van, J.W. | Khaksar, V. | Hashemipour, H. | Blok, M.C. | Spek, W.
The aim of the present study is to update the requirements for the essential amino acids of laying hens, both on a AFD and SID basis, by performing a meta-analysis on dose-response studies used to derive requirement values for essential amino acids (lysine, methionine+cysteine, threonine and tryptophan) in laying hens as presented in the literature. In this meta-analysis, the data are fitted by use of the Wood equation (see paragraph 2.4). The amino acid intake levels for realizing maximal rate of lay, egg mass and feed efficiency are provided. The amino acid requirements for use in practice are based on the amino acid intake levels at which 95% of these maximum responses were reached.
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