笼养蛋鸭产蛋初期对各营养物质利用率及血液生化指标的影响研究

Study on the Effect of Different Level Diets on Nutrients Efficiency and Serum Biochemical Indexs in Earlier Stage of Cage-feeding Laying Ducks

试验选用24周龄健康的、体重接近全群试鸭平均体重的金定鸭18只,随机分成6个处理组,每个处理3个重复,每个重复1只试鸭。试验期3天,分别对各营养物质利用率进行测定,同时,在24周龄对每个重复的试鸭进行翅静脉采血,离心,分离血清后分析血清中尿酸、尿素氮、肌酐及血清总蛋白。对营养物质利用率试验结果表明,第Ⅳ组氮沉积率明显高于其它各组,第Ⅳ组对粗纤维利用率与高蛋白组粗纤维利用率无显著差异(P>0.05),而且随着周龄的增加,对粗纤维利用率有升高的趋势。而第Ⅳ组的粗脂肪、钙和磷的利用率显著高于其它各组(P<0.05),能量和有机物质利用率呈现第Ⅰ组至第Ⅵ组依次递减的趋势,血清生化指标结果表明,第Ⅳ组试鸭在产蛋初期血清中尿素氮、肌酸酐的含量明显低于其它各组,第Ⅳ组血清总蛋白的含量与19%蛋白组无显著差异(P>0.05)。以上结果表明,第Ⅳ组(17%蛋白质水平和0.36%蛋氨酸水平)能够满足试鸭的营养需要。

Jin-ding laying ducks(19weeks of ages)were used in the metabolic trials to investigate the availability of nutrients and serum biochemical indexs at24week-age.These cage-feeding ducks were assigned to six groups randomly,with three replicated per group.The results were as followed:In the earlier stage of laying ducks,retention of nitrogen of groupⅣwas higher significantly than other groups(P <0.05).The availability of dietary EF of groupⅣwas insignificantly different from the high dietary CP levels groups(P>0.05),and tended to increase while aging.The dietary EE,Ca ,P efficiency of groupⅣwere significantly higher than all other groups(P<0.05),but dietary energy and organic matter tended to decrease from groupⅠto groupⅣ.While serum BUN and CRE contents of groupⅣwere significantly lower than all other groups.All results showed that dietary protein and methionine levels of groupⅣwere enough for the nutrition need of ducks in earlier stage of laying.