Effect of beta-Glucosidase as a Feed Supplementary on the Growth Performance, Digestive Enzymes and Physiology of Broilers

摘要

The effects of beta-glucosidase on the overall growth performance and a set of physiological parameters of broilers were investigated. 240 male, one-day old Avine broiler chickswere randomly allocated to four treatment groups and fed with a corn-soybean meal supplemented with 0% (control), 0.2%, 0.4% and 0.6% beta-glucosidase. The 0.2% beta-glucosidase group, but not the 0.4% and 0.6% beta-glucosidase groups; showed a significantly increased average daily weight gain (p < 0.05) over that of the control. All three beta-glucosidase feed groups showed significantly higher feed conversion ratios than the control group (p < 0.05). Feed supplementation of 0.2% beta-glucosidase significantly raised the contents of serum isoflavone aglycones as shown by decreases of genistin and daizin (p < 0.01) and an increase of daidzein (p < 0.01). The 0.2% beta-glucosidase feeding significantly increased the intestinal amylase activity while it had little effect on lipase and trypsin activities (p > 0.05). 0.2% beta-glucosidase feeding also significant elevated the levels of high-density lipoprotein cholesterol and malate dehydrogenase while lowering the level of low-density lipoprotein cholesterol (LDL-C). Finally, beta-glucosidase improved the anti-oxidative activities of the animals; the 0.2% beta-glucosidase feed group had higher activities of superoxide dismutase (p < 0.05), glutathione peroxidase and glutathione reductase in the liver (p < 0.05). and malondialdehyde level in the serum (p < 0.05).