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Journal of Animal and Veterinary Advances
Year: 2008  |  Volume: 7  |  Issue: 2  |  Page No.: 213 - 216

The Effects of Combination of Ethylenediaminetetraacetic Acid and Microbial Phytase on the Egg Quality Characteristics in Laying Hens

Yahya Ebrahim-Nezhad and Jamshid Gyasi-Gale Kandi    

Abstract: This experiment was carried out in order to survey the combination effect of Ethylenediamine-tetraacetic Acid (EDTA) and microbial phytase on the egg quality characteristics in commercial laying hens of Hy-line (W-36) strain in 53-64 week of age. In this experiment 192 laying hens were examined. The experimental design was completely randomized design with a 32 factorial arrangement with three levels (0.0, 0.1 and 0.2%) of ethylenediaminetetraacetic acid and 2 levels (0.0 and 300 FTU kg 1) of microbial phytase in low available phosphorus diets with 6 treatments, 4 replicates and 8 hens in each replicate. The criteria used to assess were specific gravity, eggshell thickness, Hough unit, eggshell weight and eggshell ash. The results showed that interaction effect of ethylenediaminetetraacetic acid phytase on specific gravity, Hough unit and eggshell weight was significant (p<0.05). Adding of ethylenediaminetetraacetic acid to low available phosphorus diets had not influence on the egg quality characteristics in laying hens. Phytase addition in low available phosphorus diets, increased eggshell weight and eggshell thickness significantly (p<0.05). Also, phytase addition in low available phosphorus diet did not improve eggshell ash.

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