Phytases and myo-inositol modulate performance, bone mineralization and alter lipid fractions in the serum of broilers
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University of Agriculture in Krakow, Department of Food Biotechnology, Balicka 122, 30-149 Kraków, Poland
Poznań University of Life Sciences, Department of Animal Nutrition and Feed Management, Wołyńska 33, 60-637 Poznań, Poland
National Research Institute of Animal Production, Department of Animal Nutrition and Feed Science, 32-083 Balice, Poland
Publication date: 2013-03-19
Corresponding author
K. Żyła   

University of Agriculture in Krakow, Department of Food Biotechnology, Balicka 122, 30-149 Kraków, Poland
J. Anim. Feed Sci. 2013;22(1):56-62
Under conditions simulating intestinal digestion in broilers, phytase B was found to free myo-inositol from low non-phytate phosphorus maize–soyabean meal-based and wheat–soyabean meal-based diets, whereas both 3- and 6-phytases A accelerated myo-inositol release only in the presence of phytase B. In the feeding experiment, myo-inositol at 1 g · kg–1 increased the feed intake and body weight gain of broilers fed both types of feeds. Phytase B at 1300 acid phosphatase units (AcPU) · kg–1 enhanced feed consumption, body weight gain, and tibia mineralization, whereas phytase B mixed with 6-phytase A at 500 phytase units (FTU) · kg–1 produced further enhancements in performance and bone mineralization. After 6 weeks, broilers fed the maize-based diets supplemented with both phytase B and 6-phytase A had increased serum concentrations of triglycerides and HDL-cholesterol, as well as an enhanced HDL/total cholesterol ratio. The increases in this ratio cannot be attributed to the release of phosphorus or to the generation of myo-inositol by the supplemented enzymes, but can only be explained as effects of intermediate products of phytate dephosphorylation.
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