不同植酸酶对生长育肥猪生产性能及养分利用的影响

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。

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

Abstract：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.