不同代谢能水平的日粮添加复合酶对蛋鸡产蛋性能及血液生化指标的影响

旨在探讨不同代谢能水平的日粮中添加复合酶对蛋鸡产蛋性能及血液生化指标的影响。选用1 440只体重和产蛋率相近的300日龄的海兰褐蛋鸡,随机分为6组,试验1组为基础日粮正对照组,试验3、5组分别为基础日粮降低代谢能0.16 MJ/kg和0.33 MJ/kg的负对照组,试验2、4和6组分别为在1、3和5组基础上按每吨全价料400 g的比例添加复合酶的试验组。正式试验期为45 d。试验结束时,测定并比较各组蛋鸡的产蛋性能和血液生化指标。结果表明,试验2组的T淋巴细胞转化率显著高于试验1组（P〈0.05）,但二者的其他产蛋性能和血液生化指标差异均不显著（P〉0.05）;试验4、6组的产蛋性能和血液生化指标与相应的试验3、5组相比均有显著改善（P〈0.05）。添加复合酶可以提高蛋鸡对饲料的利用率,能够挖掘饲料潜在的营养价值。

Effects of Addition of Compound Enzyme to Daily Diets with Different Levels of Metabolizable Energy on Laying Performance and Blood Biochemical Indicators of Layers

To study effects of addition of compound enzyme to daily diets with different levels of metabolizable energy on laying performance and blood biochemical indicators of layers, 1 440 healthy and 300-day Hy-Line brown with similar body weight and laying rate were chosen and divided into six groups randomly. Trial group 1 was as positive control with basal diets, while trial groups 3 and 5 were as negative controls with metabolizable energy reducing by 0.16 MJ/k and 0.33 MJ/kg respectively compared with the positive control, and trial groups 2, 4, and 6 were as experimental groups with addition of 400 g of compound enzyme to one ton of complete feed. The trial lasted for 45 days, and the laying performance and blood biochemical index of layers in various groups were determined at the end of the trial. Results show that the transformation rate of T lymphocyte in trial group 2 was significantly higher than that in trial group 1（P〈0.05）, but there were no significant differences between the two groups in other laying performance and blood biochemical indicators of layers（P〉0.05）; laying performance and blood biochemical indicators of layers in trial groups 4 and 6 improved significantly compared with trial groups 3 and 5（P〈0.05）. In a word, addition of compound enzyme can increase utilization rate of feed by layers and excavate potential nutrient value of feet as much as possible.