Effects Of Cysteamine Supplemented Continuously On Growth Performance, Meat Quality, Physiological And Biological Traits Of Broilers

The experiments were designed to investigate the effect of Cysteamine(CS) supplemented continuously on growth performance,duodenal digestive enzyme activities,antioxidant ability,meat quality,and some physiological and biological traits in blood of broilers. 240 7-day-old broilers were divided into four groups randomly, and were fed diets only differing in levels of CS (0mg/kg, 60mg/kg, 90mg/kg and 120mg/kg CS) separately. The results showed as follows:Exp.1 was to study the effect of CS on growth performance, duodenal digestive enzyme activities and physiological and biological traits in blood of broilers, and the results indicated that CS increased growth performance and activities of digestive enzymes, and the supplement of 90mg/kg and 120mg/kg CS were better than other groups(p<0.05). The feasible time for using CS was 2~3weeks. The effect of CS on cock was better than that of hen. CS decreased the levels of GLU in blood, and improved Levels of cholesterol and triglyceride in blood, when broilers were 28 days-old,which means the absorption and transformation of GLU was higher , and the utilization of fat and energy was improved. CS had different effects on the levels of uric acid inblood, the 120mg/kg CS group had the lowest concentration of uric acid while the levels of 90mg/kg group was the highest.Exp.2: The experiment was conducted to investigate the effect of CS onmeat quality. The result showed: the 120mg/kg CS treatment decreased abdominal fat weight and abdominal fat rate significantly (p<0.05), and had little effect on other traits of carcass. CS decreased drip loss and water loss rate of chicken meat, and it could improve meat tenderness and quality of collagen, content of fat in meat significantly. The 90mg/kg CS had the best meat qualities.Exp. 3: This experiment was conducted to study the effect of CS on antioxidant ability in broilers, the result showed: the effect of CS on antioxidant was different in different tissues. The activity of SOD and GSH-Px in liver, heart, and serum was higher in the 90mg/kg and 120mg/kg groups. The Omg/kg was the lowest. The activity of SOD and GSH-Px in breast muscle was lowed by CS supplementation, and the 60mg/kg group had differed from that of the control significantly (P<0.05).TAOC in liver and heart of the 120mg/kg group was higher than that of the control significantly (P<0.05)o TAOC in breast muscle of the 90mg/kg and 120mg/kg groups were higher than that of control significantly (P<0.05).But TAOC in plasma of the 60mg/kg group was the lowest, and was significantly lower than that of control (PO.05) . CS decreased the concentration of GSH and uric acid in plasma. The 60mg/kg group had the lowest serum GSH while the 120mg/kg group had a higher and the control had the highest plasma GSH. CS tend to decrease MDA in liver, heart and breast muscle, and MDA in heart muscle of the 90mg/kg and 120mg/kg groups were lower than that of the control. There were no significant difference in serum MDA among groups.Over all , CS cause a reduction of SS and a increase of GH, improve the performance of growth ,and utility of feed and nutrition, decreased abdominal fat and drip loss of meat, improved tenderness of meat ,quality of collagen and fat in meat, CS can improve the antioxidant ability.