| Three experiments were conducted to investigate the effects of AGF on the immune function, antioxidation and lipid metabolism of male broilers.In exp.1, we studied the effects of AGF on the antioxidation and lipid metabolism by a short-term giving different AGF concentration solution to the broilers.48 new-born AA male birds were randomly assigned to 4 groups, with the same dietary during the test. At 31d, gave different level of AGF to the experimental group(which are equal to 120mg/kg?bw,240mg/kg?bw and 480mg/kg?bw), with corresponding doses of 0.9% sodium chloride solution to the control group, this test last for 3 days. We determined the ability of SOD, and the content of glucose, TC, LDL-C, HDL-C at 31d, 35d, 42d. At 42d, the relative weights (% BW) of thymus, bursa and spleen in each group were estimated. The results show that short-term giving AGF to the birds can promote the development of their immune organs, 240mg/kg group has the most obvious effects among these groups; and it also can promote the animals' ability of antioxidation, and glucose, with 240mg/kg group and 480mg/kg group have a better effects on the ability of SOD. But deal with AGF in this way has no significant impacts on lipid metabolism.In exp.2, we investigate the anti-stress ability of the broilers after injecting dexamethasone into the abdomen. 48 one day AA male broilers were randomly divided into 4 groups, every group has 4 replications. The treatments include a control group and 0.025%, 0.05% and 0.1% AGF group. Began to inject dexamethasone (5mg/kg), into broilers' abdomen at 23d, this tests last out for 5 days. At 23d, 28d, 35d and 42d,we examined the antibody titer of NDV-â…£,the ability of SOD, the content of MDA, glucose, also at 28d, 35d and 42d, the relative weights (% BW) of thymus, bursa and spleen in each group were estimated. The results demonstrated that, in this way, AGF has significant effects on immune-suppressed birds, promoting the relative weight of bursa; it also can regulate the animals' capability of antioxidation, boost the ability of SOD and increase the content of MDA, it also maintains the broilers' performance effectively during the test. All of this with the best results in 0.05% group.Exp.3 is based on the achievement of the above two experiments. We examined the effects on the broilers' performance, immune function, and some indexes in the serum during a feeding period, with a different level of AGF in dietary. 288 new born AA male were randomly divided into 4 groups, every group has 6 replications. The treatments include a control group and 0.025%, 0.05% and 0.1% AGF group. At 28d, 35d, 42d, measured the relative weights (% BW) of liver, heart, masticatory stomach and thymus, bursa, spleen, and the lenth of intestine. At 21d, 28d, 35d and 42d, examined the animals' antibody titer of NDV, the ability of SOD, the content of MDA, glucose, TC, LDL-C and HDL-C. At 42d, determined the butchering performance. From 1d to 42d, body weights gain and feed intake of each replication were recorded weekly. The results indicate that AGF has beneficial influences on the body development of the birds, increasing the feed : gain and promoting the butchering quality; promoting the development of the immune organs. AGF has strong power in antioxidation, greatly enhances the ability of SOD and the content of MDA; regulates lipid metabolism resultfully, decreasing the content of TC and LDL-C, increasing the content of HDL-C. All of above has best effects in 0.05% group.In all of the three experiments, it concludes that AGF is able to promote the performance and the capacity of antioxidation of male birds, regulating their lipid metabolism effectively.
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