植酸酶对水貂氮、磷等营养物质利用及生长发育的影响

Effects of Microbial Phytase Levels on Availability of Nitrogen and Phosphorus Utilized and Performance in Growing Minks

研究鲜料中添加植酸酶水平对生长发育期水貂氮、磷利用及生长发育性能的影响。配制Ⅰ～Ⅳ组日粮，Ⅰ组为对照组（基础日粮），Ⅱ～Ⅳ组在基础日粮中分别添加450IU/kg、900IU/kg、4500IU/kg的植酸酶，进行各组日粮干物质、蛋白质、脂肪、钙、磷消化代谢试验和生长发育期饲养试验。结果表明，水貂鲜料添加植酸酶可显著提高干物质、脂肪、粗蛋白、P消化率及N代谢率（ P＜0.01），N、P环境排放量降低极显著（ P＜0.01）；可显著提高其体增重和平均日增重（ P＜0.05），其中添加900IU/kg的Ⅳ组生长发育性能最好。

Effects of microbial phytase levels on the availabitility of nutriments and growth performance in Growing Mink were studied .Sixty black male minks were randomly divided into 4 groups ,15 minks per each .The control was fed conventional fresh diet ,the testing groups were applied phytase ,respectively ,phytase 450IU/kg （Ⅱ） ,900IU/kg （Ⅲ） and 4 500IU/kg （Ⅳ） .The results showed that there were significant dif-ference among groups ,the values of DMD、CPD、EED、PD were significant higher than the control （ P〈0.01 or P〈0.05） ,phytase groups were the highest value among groups .The Ca digestibility of Ⅱ 、Ⅲ 、Ⅳ groups were higher than group Ⅰ ,but the difference are not significant （ P〉0.05） .There was clearly trend that phytase could significantly reduce the nitrogen and phosphorus excretion of growing minks （ P〈0.01） ,and increase dietary nitrogen metablic rates in minks ,the 900IU/kg phytase was the best in all groups .There were a significantly increase in the in-dex of body weight gain and average daily gain the groups of phytase than control group （ P〈0.05） .The results showed that it could significant-ly improve the growth performance and availabitility of DM、CP、EE、Ca、P ,applied 900IU/kg of phytase during growing period in mink diets .