Phytase in diets with crude prot ein levels for commercial layers
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Universidade Estadual de Maringá
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The aim of this study was to evaluate the acti on of the phytase enzyme in diets formulated with variations in the crude protein content on performance and egg quality of commercial layers. A total of 336 commercial layers were housed at eight birds pe r cage in a 3 × 2 factorial arrangement with seven replicates. Treatments consisted of four crude-protein levels (17, 15, and 13%) and two enzyme levels (0 and 500 FTU kg -1 diet), distributed in a completely randomized design. Feed intake, egg production, feed conversion per dozen eggs and per kilogram, egg we ight and mass, specific gravity, eggshell thickness, and Haugh unit were measured over five 28-day peri ods. The performance of commercial layers fed the diet containing 13% crude protein worsened, irrespec tive of phytase addition. However, at 15% crude protein, phytase inclusion did not affect feed conversi on or egg weight. Inclusion of phytase leads to equal egg-quality and performance results at the dietary crude protein levels of 17 and 15%. The crude protein content of 13%, with or without phytase, is no t recommended for the diet of brown-egg layers.
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