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Influence of Dietary Zeolite Supplementation on the Performance and Egg Quality of Laying Hens Fed Varying Levels of Calcium and Nonphytate Phosphorus

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Author(s): H. Nassiri Moghaddam | R. Jahanian | H. Jahanian Najafabadi | M.M. Madaeni

Journal: Journal of Biological Sciences
ISSN 1727-3048

Volume: 8;
Issue: 2;
Start page: 328;
Date: 2008;
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Keywords: laying hen | Ca and P level | eggshell quality | egg production | Zeolite

ABSTRACT
Natural zeolites have been shown to influence calcium and phosphorus utilization in laying hens. A 4x2 factorial arrangement of treatments was used to investigate the effects of dietary inclusion of zeolite (0, 1.5, 3 and 4.5% of diet) into the diets with sufficient or deficient Ca (3.26 and 2.45%) and non-phytate P (0.25 and 0.19%) contents on egg performance and egg quality parameters of 28 week-old Hy-Line (W-36) Leghorn hens. The trial lasted 98 days (2 week adaptation and 12 week recording periods), when the hens were 42 week-old. Significant dietary effects of feeding zeolite were observed for hen-day egg production, egg mass, egg weight, Haugh score and shell thickness at the initial 6 weeks of recording period, while dietary zeolite supplementation tended to/or had no significant effects on studied parameters at the second 6 weeks of experimental period. Dietary added zeolite caused a significant increases in egg weight (p
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