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Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2003;16(2): 239-247.
https://doi.org/10.5713/ajas.2003.239    Published online January 1, 2003.
Effects of Microbial Phytase Replacing Partial Inorganic Phosphorus Supplementation and Xylanase on the Growth Performance and Nutrient Digestibility in Broilers Fed Wheat-based Diets
Y. L. Peng, Y. M. Guo, J. M. Yuan
Two experiments were conducted with broilers to investigate the feasibility of microbial phytase replacing partial inorganic phosphorus supplementation and the synergistic effects of xylanase (320 FTU/kg) supplementation alone or in combination with phytase (750 U/kg) replacing 0.08% dietary inorganic phosphorus, on the growth performance and utilization of nutrients in broilers fed wheat-based diets. In Experiment 1, 540 broilers were fed five diets for 6 weeks. Diets C0 and C1 were corn-based diets and 0.08% inorganic P supplementation was replaced with 750 U phytase/kg feed in Diet C1. Diets W0, W1 and W2 were wheat-based diets supplemented with microbial phytase 0, 750, 750 U/kg feed and 0, 0.08% and 0.16% dietary inorganic P were replaced, respectively. In Experiment 2, 432 broilers were divided into four treatments to determine the synergistic effects of supplemental xylanase and phytase replacing 0.08% inorganic P. Four experimental diets were arranged according to a 2횞2 factorial design. The results indicated that addition of phytase increased the digestibility of phytic P by 31.0 to 55%, dramatically decreased the excretion of phytic P and total P by 31.6 to 55.0% and 13.8 to 32.9%, respectively (p<0.01). It is feasible to completely replace 0.08% inorganic phosphorus supplementation with microbial phytase 750 U/kg in corn- or wheat-based diets for broilers. Addition of xylanase alone or in combination with phytase replacing 0.08% dietary inorganic P, increased body weight gain and feed utilization efficiency of broilers fed wheat-based diets (p<0.10) and decreased overall mortality (p<0.10). In the groups of birds supplementing xylanase 320 FTU /kg feed, a marked elevation of the dietary AME was observed (p<0.05). Addition of phytase replacing 0.08% dietary inorganic phosphorus, concurrently with xylanase supplementation had additive effects on the apparent digestibility of dietary phytic P and overall feed conversion ratio (p<0.05).
Keywords: Broilers; Phytase; Xylanase; Wheat-based Diet; Inorganic Phosphorus

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