不同钙磷水平对新扬州(蛋)鸡生产性能、蛋壳质量及骨代谢的影响

选用36周龄新扬州(蛋)鸡600只,按2×2因子安排的完全随机设计分为4组(高钙低磷组、高钙高磷组、低钙低磷组、低钙高磷组),每组5个重复,分别饲喂不同钙磷水平的玉米-豆粕型日粮,饲养42d,研究饲粮不同钙磷水平对新扬州(蛋)鸡生产性能、蛋壳质量、内分泌、胫骨质量的影响。高钙高磷组平均产蛋率显著高于两低钙组,试验期体增重显著高于其他3组(P<0.05),蛋比重、蛋壳强度、蛋壳厚度、蛋壳比例等蛋壳质量指标也均显著高于其他3组(P<0.05),高钙高磷组E2水平显著高于低钙低磷组(P<0.05),BGP、PTH、CT各组间差异不显著,各组间胫骨系数及密度差异不显著。研究结果表明,饲粮钙磷水平分别为3.5%、0.32%,二者比例约11∶1时,蛋鸡生产性能、蛋壳质量最佳,内分泌及骨代谢最为理想。

Effects of Calcium and Phosphorus Levels on Production Performance and Endocrine in New Yangzhou Chickens

600 New Yangzho uchickens which were 36-week-old and laying,by 2×2 factor for the complete random divided into four treatments (high calcium and low phosphorus treatment,high calcium and hig hphosphorus treatment,low calcium and low phosphorus treatment,low calcium and high phosphorus treatment),each treatment had five repeats,feeding corn-soybean meal diet with different levels of calcium and phosphorus,this article studied in 42d the effects of different levels of calcium and phosphorus on laying hen perform ance,eggs quality,endocrine and tibia quality.The average of laying rate in high calcium and high phosphorus were significantly higher than two low calcium treatments (P< 0.05),weight gain in high calcium and high phosphorus were significantly higher than the other treatments (P< 0.05),the specific gravity of eggs,eggshell strength,eggshell thickness and eggshell proportion also were significantly higher than the other treatment (P< 0.05).High calcium and high phosphate treatment of E₂ level was significantly higher than low calcium and low phosphorus treatment (P< 0.05),BGP,PTH,CT,tibia index and tibia mineral density each treatment the difference was not significant.The results show that,under the conditions of thermalstress,dietary calcium and phosphorus levels were 3.5%,0.32%,about 11:1,laying hen production performance,egg quality,bone metabolic profile and BGP,CT,PTH,E2 were desirable.