The Effects of Supplemental Microbial Phytase on the Utilization of Dietary Mirnerals in Broiler Chickens Fed Corn-Soybean and Corn-Wheat-Soybean Diets

D. Chotinsky, Е. Stancheva, Ch. Stanchev

Abstract: Two experiments were conducted to evaluate the effects of dietary phytase in corn-soybean and corn-wheat-soybean meal on content and retention of minerals (Ca, P, Mg, Mn, Cu, Zn & Fe) and content of minerals of bone of tibia. In experiment 1 involved a normal P level corn-soybean meal and a low P diets plus phytase 0.125, 250, 500, 700 PU/kg) diet. A second experiment was conducted with a normal P level corn-wheat-soybean diet and a low P plus phytase (250, 500 PU/kg) diet. Phytase supplementation of the low P corn-soybean diets decreased the content of Ca, P, Mg and Zn in organism of broiler chickens. The addition of microbial phytase in a low P diet increased the content of Cu and Fe when added 250 PU/kg phytase for Cu and 250 and 700 PU/kg phytase for Fe. Phytase supplementation of the low P diet decreased retention of Ca, P, Mg and Zn, but increased retention of Cu, Mn and Fe when fed corn-soybean meal plus 500 and 700 PU/ kg phytase for Cu and Fe and 250 PU/kg phytase in corn-soybean meal and 500 PU /kg phytase in corn-wheat-soybean meal for Mn. The content of tibia ash, Ca, P and Mg were decreased in experiment 1 and 2, but had no effect on the content of tibia ash when fed corn-soybean diet plus 700 PU/kg phytase and P increased when fed corn-wheat-soybean plus 500 PU/kg phytase and Mg when fed corn-soybean diet plus 250 PU/kg phytase

Keywords: balance; chicken broilers; microbial phytase; mineral; tibia bone; Trace elements

Date published: 2019-06-26