The effect of microbial phytase applied in feed mixtures on phosphorus and calcium ulitization in chicken broilers
1997
Zobac, P. | Kumprecht, L. | Simecek, K. (Vyzkumny Ustav Vyzivy Zvirat, Pohorelice (Czech Republic)) | Volfova, O. | Dvorakova, J.
An enzymic preparation containing phytase, produced by fermentation of recently isolated strain 921 of Aspergillus niger, was used in a trial on chicken broilers. Phytase activity of 490 PU/g was determined in the produced preparation. Maximum activity was observed at temperatures ranging from 50 to 55 degrees C and at the environmental pH value 5.0. The preparation was applied at a concentration of 0-15 g of the substance per 100 g of BR1 or BR2 feed mixture. Results show that phytase need in BR2 mixture is higher than that in BR1 mixture, which can be explained by the higher percentage of grains in BR2 mixture, that means by the higher content of phytate phosphorus. The supply of inorganic phosphorus in form of DiCaP not only decreased the optimum phytase level both in the first and second production periods, but also it improved chicken growth and feed conversion, which suggests that it is necessary to determine the most appropriate concentrations of DiCaP in BR1 nd BR2 mixtures.
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