植酸酶对肉鸭饲用原料钙与磷及其养分真利用率的影响

在18种常用肉鸭饲料原料中添加750 U/kg的植酸酶,通过鸭的强饲代谢试验来探究植酸酶对钙、磷及干物质、粗蛋白、粗脂肪、能量等真利用率的改善程度。结果表明:与加酶前比较,加酶后供试原料的总磷真利用率的提高幅度为0.92%~17.29%,其中,对次粉2、麦麸、米糠、玉米总磷的提高幅度差异达到显著或极显著水平,分别为11.79%(P0.05)、8.46%(P0.05)、17.29%(P0.05)、16.33%(P0.01),其余原料的总磷真利用率均有不同程度的提高,但差异不显著(P0.05);对钙真利用率的提高幅度为2.74%~22.12%,其中,对碎米(早)、玉米皮、小麦、麦麸、棉粕的钙真利用率的提高作用显著(P0.05),分别为16.37%、17.12%、30.75%、21.40%、22.12%,对糙米(晚)的提高幅度最小,仅为2.74%,对其余原料的提高幅度均在5%以上;加酶后供试原料的干物质、粗蛋白、粗脂肪、能量真利用率的提高幅度分别为0.03%~14.60%,0.71%~27.05%,2.00%~37.69%、0.17%~10.07%;植酸酶对原料有效磷的改进值范围为0.02~2.60 g/kg。综合分析,在肉鸭饲料原料中添加750 U/kg的植酸酶,对钙、磷及干物质、粗蛋白、粗脂肪真利用率的改善效果较明显。

Study of phytase on bioavailability of calcium,phosphorus and other nutrients of feedstuffs for ducklings

The study was conducted via metabolic experiment of forced feed on Linwu ducks to determine the effects of phytase (750 U/kg) supplemented to 18 kinds of feedstuffs on the utilization of calcium, phosphorus, and other nutrients. Results showed that the true utilization rate of phosphorus by the supplementation of phytase to all feedstuffs could be improved by range from 0.92% to17.29%, and among of which, to wheat middling 2, wheat bran, rice bran, and corn powder were improved 11.79% (P<0.05), 8.46% (P<0.05); 17.29% (P<0.05) and 16.33% (P<0.01) respectively, which had reached significant or very significant level. While, the utilization rate on the rest of the feedstuff''s, on the contrast, were some improved, but they did not reach up to the significant level (P>0.05). The true utilization rate of calcium by supplementation of phytase to all feedstuffs could be improved by the range from 2.74% to 22.12%, furthermore, to broken rice (early), corn, wheat, wheat bran, and cotton pulp''s, the utilization rate had reached the significant level (P<0.05) with the respective value of 16.37%, 17.12%, 30.75%, 21.40% and 22.12%. The improvement by the supplementation of phytase to all feedstuffs increased by over 5% except for to brown rice (late), which was only by 2.74%. The supplementation of Phytase respectively increased the true utilization rate of dry matter, crude protein, crude fat, and energy by from 0.03% to14.60%, 0.71% to 27.05%, 2.00% to 37.69% and 0.17% to 10.07%; and the efficient phosphorus improvement value for 18 feedstuffs ranged from 0.02 g/kg to 2.6 g/kg. Therefore, there were great effects by supplementation of phytase to duck feedstuffs on the enhancing utilization rate of phosphorus, calcium and other nutrients.