Effect of phytase in laying hen diets with different phosphorus sources

Revista Brasileira de Ciência Avícola

Em Casartelli²  Om Junqueira²  Ac Laurentiz²  Rs Filardi²  J Lucas Júnior¹  Lf Araujo¹ 

[1] ,Universidade Estadual Paulista IDepartamento de Zootecnia Jaboticabal

关键词: Commercial laying hens;    eggshell quality;    phosphorus sources;    phytase enzyme;   

DOI  :  10.1590/S1516-635X2005000200005

来源: SciELO

【 摘 要 】

An experiment was conducted to evaluate the effects of the enzyme phytase in diets formulated with different phosphorus sources on performance, eggshell quality and excretion of commercial laying hens. Two hundred and eighty-eight commercial Hyssex Brown laying hens were evaluated during two production phases, which included eight twenty-eight-day cycles, using a completely randomized design in a 3x2 factorial with six replicates of eight birds per treatment. Three phosphorus sources (calcium and sodium phosphate, micro-granulated dicalcium phosphate and triple super phosphate) and two phytase levels (0 or 1000 FTU/kg diet) were tested in the composition of the diets. After the post-peak period, triple super phosphate decreased bird performance and eggshell quality. It was possible to reduce the levels of phosphorus supplementation when phytase was added to the diet. Besides, phytase supplementation reduced phosphorus, calcium and nitrogen excretions, but affected mean egg weight at production peak.

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