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Asian-Australas J Anim Sci > Volume 12(2); 1999 > Article
Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1999;12(2): 203-208.
DOI: https://doi.org/10.5713/ajas.1999.203    Published online March 1, 1999.
Effects of Microbial Phytase Supplementation to Diets with Low Non-Phytate Phosphorus Levels on the Performance and Bioavailability of Nutrients in Laying Hens
J. S. Um, I. K. Paik, M. B. Chang, B. H. Lee
Abstract
An 8 week feeding trial was conducted with 864 ISA Brown laying hens, 48 weeks old, to determine if microbial phytase (Natuphos짰) supplementation can reduce non-phytate phosphorus (NPP) level in laying diets. The experiment consisted of four dietary treatments : T1, control diet with 0.26% NPP (0.55% total P) wand no supplementary phytase ; T2 0.21% NPP (0.50% total P) diet with 250 U of phytase/kg of diet ; T3, 0.16% NPP (0.45% total P) diet with 250 U of phytase/kg of diet ; and T4, 0.11% NPP (0.40% total P) diet with 250 U of phytase/kg of diet. T3 showed the highest egg production and egg weight and the lowest feed conversion while T4 gave the lowest egg production and the highest feed conversion and mortality. Daily feed consumption ranged from 130.4 g (T4) to 132.7 g (T2). T1 and T2 were not significantly different in the production parameters. Eggshell strength, egg specific gravity, and eggshell thickness were not significantly different among treatments. However, broken egg ratio was significantly lower in T2 and T4 than in T1. Retentions of Ca, P, Mg, and Cu were greater in phytase supplemented treatments (T2, T3 and T4) were significantly (p<0.05) smaller than in T1 but excretions of N were not significantly different among the treatments. Contents of ash in tibiae were not significantly affected by treatments, but contents of Ca, P, Mg, and Zn was increased and that of Cu decreased by phytase supplementation. It is concluded that the NPP concentration in the diet of Brown layers consuming about 130 g/d of feed can be safely lowered from 0.26% (0.55% total P) to 0.16% (0.45% total P). The excretion of P was reduced by the inclusion of 250 U phytase/kg of diet.
Keywords: Laying Hens; Phytase; Egg Production; Phosphorus Excretion; Tibia Minerals


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