Study On The Optimum Allowance Of Copper And Nutrition Monitoring Model In Small-fat-tail Sheep

The status was studied on whether copper was surplus or lack in small-fat-tail sheep by the survey of feed resource and diet component, the measuration of liver and blood copper concentration, as well as supplemental feeding method. Different concentration molybdenum and sulfur being added to the diet of small-fat-tail sheep, the indexes that production performance, concentration of blood ccpper, serum ceruloplasmin activity, serum superoxide dismutase activity etc were investigated and the optimum allowance and nutrition monitoring method of copper were gained under different condition of breeding sheep.The range copper concentration of the six investigated sheep diets was 41.1%~96.5% of Chinese sheep breeding standard. The liver and blood copper concentration of all investigated areaes are under standard except that of Tai'an city. After different levels being added copper to the diet of sheep in Jining , the coat, avoirdupois, concentrations of blood copper of tested sheep were improved than comparison group. Therefore, the conclusion was gained that the copper of small-fat-tail sheep diet don't fill the natural requirement of sheep growth.The experiments were conducted in random design to access the effects of dietary molybdenum, sulfur and copper on change orderliness of some blood biochemistry indicators in small-fat-tail sheep. The results indicated that with supplement of copper to diets with lower level of molybdenum or sulfur, the concentrations of blood copper, the activities of serum ceruloplasmin and superoxide dismutase increased little (P > 0.05), but with higher level of molybdenum or sulfur, the three blood indicators have greatly changed (P < 0.05). With supplement of molybdenum or sulfur to diets with same level of copper, the three blood indicators greatly declined (P < 0.05). After molybdenum and sulfur being added to diets at the same time, the bloodindicators declined more greatly. From the production performance, concentration of blood copper, activities of serum ceruloplasmin and superoxide dismutase of small-fat-tail sheep, the optimum allowance model was gained. It suggest that optimal allowance of copper were 15.5, 25.5, 25.5 and 35.5 mg/kg for Small-fat-tail sheep fed diets containing molybdenum and sulfur 0.5mg/kg and 1.6g/kg, 5.5mg/kg and 1.6g/kg, 0.5mg/kg and 3.6g/kg, 5.5mg/kg and 3.6g/kg respectively. The correlation regression analyzing proved that the next regression expressions to monitoring the Nutrient status of copper in small-fat-tail sheep were:Y = 0.0282Xi +0.0078 (R2 = 0.971)Y = 0.0098X2-0.2985 (R2= 0.950)Y = 0.022X,+ 0.002 X2-0.071 (R2= 0.973)Y: blood copper concentration ((ig/ml); XI: serum ceruloplasmin activity (U/ml); X2: serum superoxide dismutase activity (NU/ml).