本试验旨在研究不同植酸磷水平饲粮中添加植酸酶对肉鸭生长性能和血清生化指标的影响。选用1日龄樱桃谷肉鸭504只，随机分为7组，包括1个高非植酸磷（前期4.0 g/kg；后期3.4 g/kg）对照组和6个低非植酸磷（前期2.4 g/kg；后期1.8 g/kg）试验组。试验组饲粮采用2×3因子完全随机设计，植酸磷设2.00和3.50 g/kg 2个水平，植酸酶设500、1 000和1 500 U/kg 3个水平。每组设6个重复，每个重复12只鸭。试验期40 d。结果表明，饲粮植酸磷和植酸酶水平显著影响肉鸭全期平均日增重（ADG）（P<0.01）、平均日采食量（ADFI）（P<0.01）以及后期料重比（F/G）（P<0.05），其中高植酸磷饲粮显著优于低植酸磷饲粮（P<0.05）。植酸磷和植酸酶水平对末均重、平均日增重、平均日采食量和料重比均呈现显著的互作效应（P<0.05）。低植酸磷饲粮中肉鸭ADG和ADFI随着植酸酶添加量提高而显著提高（P<0.05），高植酸磷饲粮中1 000 U/kg组显著高于500 U/kg组（P<0.05），与1 500 U/kg组无显著差异（P>0.05）。植酸酶水平显著影响肉鸭21和40日龄血清磷水平以及21日龄血清碱性磷酸酶活性（P<0.01），但对21和40日龄血清钙水平和40日龄血清碱性磷酸酶活性无显著影响（P>0.05）。结果提示，在低非植酸磷饲粮中添加植酸酶可提高肉鸭的生长性能，其中在高植酸磷饲粮中的效果优于低植酸磷饲粮；随着植酸酶水平的增加，血清碱性磷酸酶活性降低。

This experiment was conducted to study the effects of adding phytase into diets with different levels of phytate phosphorus (PP) on the growth performance and serum biochemical indices of ducks. A total of 504 cherry valley ducks at the age of 1-day-old were randomly assigned to seven groups, which included one high non-phytate phosphorus (NPP, prior period, 4.0 g/kg; later period, 3.4 g/kg) control group and six low NPP (prior period, 2.4 g/kg; later period, 1.8 g/kg) experimental groups. Diets were formulated to contain two levels of PP (2.00 and 3.50 g/kg) and three levels of phytase (500, 1 000, 1 500 U/kg) by a 2×3 factorial arrangement. Each group had 6 replicates with 12 ducks per pen. The experiment lasted for 40 days. The results showed as follows: the PP and phytase levels significantly affected the average daily gain (ADG) (P<0.01) and average daily feed intake (ADFI) (P<0.01) in the whole period and feed/gain (F/G) (P<0.05) in the later period, and the high PP diet was superior to the low PP diet (P<0.05). There were significant interactions on final body weight (FBW), ADG, ADFI and F/G between PP and phytase levels (P<0.05). The ADG and ADFI in low PP diet were significantly improved (P<0.05) with the phytase levels increasing. The ADG and ADFI in 1 000 U/kg group of high PP diet were higher than those in 500 U/kg group (P<0.05), but the differences were not significant between the 1 000 and 1 500 U/kg groups (P>0.05). The phytase levels significantly affected the serum P level of ducks at 21 and 40 days of age and alkalescence (AKP) activity of ducks at 21 days of age (P<0.01) and did not significantly affect the serum Ca level of ducks at 21 and 40 days of age and serum AKP activity of ducks at 40 days of age (P>0.05). In conclusion, adding phytase in low NPP diets could significantly improve the growth performance of ducks, especially in high PP diet. With the phytase levels increasing, the serum AKP activity was decreased.［Chinese Journal of Animal Nutrition, 2010，22（4）:1063-1070］