在玉米—豆粕型日粮中添加植酸酶对生长猪性能和粪中磷含量的影响

试验选取60头生长猪（12．5kg)，随机分成3组，饲喂玉米－豆粕型日粮。对照组日粮中添加0．8％磷酸氢钙（总磷0．56％、植酸磷0．26％），试验组分别以200g/t的植酸酶取代2／3和全部的磷酸氢钙（总磷分别为0．48％和0．42％，植酸磷均为0．26％），56d试验结果表明，用植酸酶（200g/r)取代2／3的磷酸氢钙、生长猪的日增重、饲料报酬和经济效益与对照组均无明显差异，但用200g/t植酸酶取代全部的磷酸氢钙，上述指标则明显下降。添加植酸酶后，粪中磷含量分别下降40．0％和51．2％。

Effects of supplementation of phytase in corn-soybean meal diets on growing pig performance and fecal phosphorus content

Sixty growing pigs (12.5 kg) were randomly allotted to one of treatments and fed corn-soybean meal diets. The control diet was supplemented with 0.8% dicalcium phosphate (0.56% total phosphorus and 0.26% phosphorus phytate). The test diets were the control diet whose dicalcium phosphate was 2/3 or totally replaced with 200 g/t of phytase (0.48% or 0.42% total phosphorus and 0.26% phosphorus phytate). The 56-day trial showed that replacing 2/3 dicalcium phosphate with 200 g/t phytase resulted in insignificant differences in daily weight gain, feed conversion and economic returns compared with the control diet. However, replacing all dicalcium phosphate with 200 g/t phytase resulted in obvious decreases in daily weight gain, feed conversion and economic returns. Supplementation of phytase led to decreases of 40.0% and 51.2%, respectively, in fecal phosphorus.