Effect Of Alfalfa Glycosides On Carcass Merit, Serum Lipid And Antioxidative Function Of Broilers

This dissertation consisted of two experiments. It was designed to study the effect of alfalfa glycosides supplementation on growth performance , carcass merit, serum lipid and antioxidative function of broilers.The experiment was conducted using a total of 96 1-day AA broilers of commercial strain to study the effect of alfalfa glycosides supplementation on growth performance, carcass merit and serum lipid of broilers. Chicks were randomly assigned to three treatments .During the phase of 1st-21st days , chicks in treatment 1 were fed basal diet (control), chicks in treatment 2 and treatment 3 were fed basal diet supplemented with alfalfa glycosides at 0.1% and 0.1%, respectively. Experiment 1The results were as follow: (1) Dietary supplementation of alfalfa glycosides decreased average daily weight gain during the phase of 1st-21st days, increased andaverage daily weight gain and feed conversion rate during the total phase of 1st-49thdays. There were no significant differences (P>0.05) . (2) Chicks received alfalfa glycosides had higher carcass yield, brisket rate, leg muscle rate, and the addition ofdietary alfalfa glycosides at the 0.2% significantly increased leg muscle rate (P<0.05) at the 35d of age. (3) Chicks received alfalfa glycosides had lower abdomen fat rate, the addition of alfalfa glycosides at 0.2% signicantly decreased abdomen fat rate (P<0.05) at the 35d of age, and the addition of alfalfa glycosides at 0.1% significantly decreased abdomen fat rate (P<0.05) at the 49d of age. (4) Dietary supplementation of alfalfa glycosides at 0.1% and 0.2% both significantly decreased serum total cholesterol and low-density lipoprotein cholesterol level (P<0.05 or PO.01), significantly increased serum high-density lipoprotein cholesterol level (P<0.05).Dietary supplementation of alfalfa glycosides had lower triglycerides level, and the addition of dietary alfalfa glycosides at the 0.2% significantly decreased serum triglycerides level (P<0.05). (5) Dietary supplementation of alfalfa glycosides at 0.1% and 0.2% both significantly decreased serum total cholesterol, triglycerids and low-density lipoprotein cholesterol level (P<0.05 or P<0.01), significantly increased serum high-density lipoprotein cholesterol level (P<0.05 or P<0.01). Experiment 2The results were as follow: (1) At the 35d of age, dietary supplementation of alfalfa glycosides at 0.1% and 0.2%, both significantly increased serum glutathione peroxidase level (P<0.05 or P<0.01), and had lower serum superoxide dismutase and malonaldehyde level, but there were no significant differences (P>0.05) . (2) At the 49d of age, the addition of dietary alfalfa glycosides at the 0.1% had no significant effect on serum glutathione peroxidase, superoxide dismutase and malonaldehyde level (P>0.05) ; The addition of dietary alfalfa glycosides at the 0.2% significantly decreased serum malonaldehyde level (P<.05), had no significant effect on serum glutathione peroxidase and superoxide dismutase level(P>0.05). (3) At the 35d of age, the addition of dietary alfalfa glycosides at the 0.1% significantly decreased liver malonaldehyde level (P<0.05), had no significant effect on liver glutathione peroxidase and superoxide dismutase level (P>0.05) ; The addition of dietary alfalfa glycosides at the 0.2% significantly decreased liver malonaldehyde level (P<0.01), significantly increased liver glutathione peroxidase level (P<0.05), had lower superoxide dismutase level, but there were no significant differences (P>0.05). (4) At the 49d of age, dietary supplementation of alfalfa glycosides at 0.1% and 0.2%, both significantly decreased liver superoxide dismutase level (P<0.01) and malonaldehyde level (P<0.01), had higher glutathione peroxidase level, but there were no significant differences (P>0.05) .