不同植酸酶对生长育肥猪生产性能及养分利用的影响

Effects of Different Phytase on the Utilization of Nutrients and Performance of Growing-finishing Pigs

选择"杜×长×大"三元杂交生长猪54头,研究了大肠杆菌、黑曲霉来源植酸酶替代日粮中部分磷酸氢钙对生长育肥猪生长性能、养分消化率、血液生化指标及粪磷、氮排泄的影响。试验猪随机分成对照组、试验Ⅰ组、试验Ⅱ组,每组3个重复。对照组饲喂常规日粮,试验Ⅰ组饲喂低磷+植酸酶Ⅰ的日粮,试验Ⅱ组饲喂低磷+植酸酶Ⅱ的日粮。试验结果表明,在生长育肥猪日粮中添加植酸酶替代部分磷酸氢钙,改善了生长育肥猪生长性能,其中添加大肠杆菌植酸酶显著改善生长育肥猪的生长性能;显著改善了干物质、粗蛋白质、钙、磷、总能的表观消化率,并显著降低了粪中氮、磷的排泄;显著提高了血清中总蛋白、球蛋白、血清磷的浓度,而尿素氮、血清钙浓度显著降低。添加黑曲霉植酸酶后,血糖浓度下降,而碱性磷酸酶的活性无显著变化;添加大肠杆菌植酸酶后,碱性磷酸酶的活性显著降低,而血糖浓度无显著变化。

In this experiment fifty-four growing pigs were conducted to study the effects of Escherichia coli phytase and Aspergillus niger phytase substitute Calcium phosphate in diet on the growth performance,nutrient utilization,serum biochemical parameters and excretion of feces P and N for growing-finishing pigs.There were 3 treatments with control group,experiment groupⅠ,experiment groupⅡ,and normal diet was fed to control group,low-P diet adding phytaseⅠwas fed to experiment groupⅠ,low-P with adding phytaseⅡwas fed to experiment groupⅡ.Each treatment had 3 replicates with 6 pigs per pen.The addition of phytase in low-P diet improved ADG,reduced F/G,what is more,supplement Escherichia coli phytase to diet had significantly improved the growth performance of pigs.Adding phytase in low-P diet improved the apparent digestibility of DM,CP,CF,EE,Ca,P,GE respectively（P〈0.05）.The excretion of feces P and feces N was decreased by fed low-P with adding Phytase diet.The concentration of total protein,globulin,P were improved by adding phytase（P〈0.05）,the concentration of BUN,serum Ca was decreased by fed diets with adding phytase（P〈0.05）.The enzymatic activity of alkaline phosphatase in serum was not affected and the concentration of serum sugar was decreased by adding Aspergillus niger phytase;the enzymatic activity of alkaline phosphatase in serum was decreased（P〈0.05） by adding Escherichia coli phytase.