葡萄糖酸钠和植酸酶对1～3周龄肉鸡磷利用的影响

用350只1周龄的Arbor Acres(AA)商品肉公鸡进行试验，采用2×3＋1试验设计，其中葡萄糖酸钠2个水平（0.2%），植酸酶3个水平（0.500、1000 U/kg），另有一满足NRC钙、磷需要的正常日粮，共7个处理，每个处理5个重复，每个重复10只鸡。研究玉米-豆粕型低磷日粮中添加葡萄糖酸钠和植酸酶对肉鸡磷利用的影响。试验期1～3周。结果表明，在低磷日粮中添加葡萄糖酸钠显著提高了肉鸡的钙（P=0.003）和磷（P<0.001）的表观存留率，降低了血清碱性磷酸酶活性（P=0.038）；植酸酶提高了肉鸡的胫骨灰分重量（P<0.001）、钙（P=0.005）和磷（P<0.001）的表观存留率。在胫骨灰分重量（P=0.030）和磷表观存留率（P=0.008）上，葡萄糖酸钠和植酸酶存在互作。

Effects of Sodium Gluconate and Phytase on Phosphorus Utilization in Broilers during 1 to 3 Weeks

One experiment was conducted using a total of 350 one week old Arbor Acre male chicks to investigate the effects of sodium gluconate (NaGlu, 0 and 2%) and phytase (0, 500 and 1000 U/kg) on phosphorus utilization. A 2×3 plus 1 factorial arrangement of treatments was adopted. A positive control diet, adequate in nonphytate P and Ca without NaGlu and phytase, was used. Chickens were randomly assigned by body weight to seven treatments and each dietary treatment was replicated 5 times. The experiment lasted from week 1 to 3 posthatching. The results showed that adding 2% NaGlu improved apparent retention of Ca (P=0.003）and P (P<0.001) and decreased serum alkaline phosphatase activity (P=0.038)of chicks. Supplementation of phytase increased tibia ash weight (P<0.001), apparent retention of Ca(P=0.005）and P (P<0.001). There was a significant interaction between NaGlu and phytase for tibia ash weight (P=0.030) and P apparent retention (P=0.008).