Effect of phytase on relationship between nutrients metabolism and phytate contents of poultry fed diets

Chinese. 为了探讨添加植酸酶后家禽日粮中植酸含量与营养物质代谢的关系，选用爱拔益加成年公鸡24只，随机分为6组，每组4个重复，设计日粮的植酸含量分别为 0，4，6，8，10和12 g/kg，以日粮中未添加植酸酶作为对照组，研究日粮中添加植酸酶（处理组）对磷平均真消化率、粗蛋白（CP）和赖氨酸表观消化率及表观代谢能的影响。结果表明，日粮的植酸含量为4，6，8，10，12 g/kg时，处理组与对照组相比，磷（P）的平均真消化率分别提高了3.03%，10.12%(P0.05)，16.90%(P0.05)，37.71%(P0.05)和28.14%(P0.05)；表观代谢能（AME）分别提高了0.018，0.078，0.191，0.309和0.217 MJ/kg；粗蛋白（CP）表观消化率分别提高了0.24%，2.26%，3.60%，4.00%和1.85%；赖氨酸（Lys）表观消化率分别提高了1.01%，1.70%，3.05%，4.82%和1.89%。磷真消化率、AME、CP和Lys表观消化率分别与日粮的植酸含量呈负线性关系。由试验结果可知当日粮植酸含量为10 g/kg时，营养物质利用率提高幅度最大。

English. To study the effect of microbial phytase on nutrients metabolism and to study the regressive equations of the nutrients metabolism with contents of phytic acid, 24 Arbor Acres clocks were randomly divided into six treatments according to a random factorial arrangement, and each treatment represented by four replicates of one clock each, and clocks were fed diet with 0, 4, 6, 8, 10, 12 g/kg phytic acid. The results showed that compared with control group, average true digestibility of phosphorus was increased by 3.03%, 10.12% (P0.05), 16.90% (P0.05), 37.71% (P0.05), and 28.14% (P0.05), respectively; apparent metabolisable energy was increased by 0.018, 0.078, 0.191, 0.309 and 0.217 MJ/kg, respectively; apparent digestibility of crude protein was increased by 0.24%, 2.26%, 3.60%, 4.00% and 1.85%, respectively; apparent digestibility of lysine was increased by 1.01%, 1.70%, 3.05%, 4.82% and 1.89%, respectively. Besides there was negative regressive equation relationship between true digestibility of phosphorus, crude protein, Lysine, metabolism energy and phytic acid content in diets, respectively, which showed the nutrients digestibility were increased by added pyhtase in diets.