期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 51, 期 16, 页码 4687-4693出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf034122x
关键词
phytate phosphorus; calcium; absorption; micro-minerals; broilers
Phytate phosphorus (PP) hydrolysis by a 3-phytase was studied in vitro at pH 2.5 and 6.5 with either 0, 1.0, 4.0, or 9.0 g of Ca/kg diet, or 0, 1.0, 5.0, 7.5, or 10.0 g/kg diet of micro-mineral premix added as inorganic (IMM) or an equivalent level as micro-mineral-amino acid complexes (MAAC). Adding Ca or micro-minerals reduced (P < 0.05) PP hydrolysis at both pHs; however, the effect was greater at pH 6.5. An in vivo experiment was conducted in which broilers were fed one of six diets for 30 h. The experimental design was a factorial of three micro-mineral forms (0 added, IMM, and MAAC) and two Ca levels (0 or 5 g/kg). Adding Ca reduced (P < 0.05) PP disappearance and increased Ca apparent absorption. No micro-minerals effect (P > 0.05) was seen. Therefore, in poultry diets, it is Ca that inhibits PIP hydrolysis and decreases P availability.
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