摘要
3头带有瘤胃和真胃痿管的肉牛(375±25kg)饲喂全羊草以满足其维持需要 ,设计3个对比试验 ,每一试验均向瘤胃内持续灌注高乙酸摩尔比(75 %)的混合VFA。试验一 :真胃每天持续灌注100g、250g和400g 的葡萄糖 ;试验二 :真胃每天持续灌注200g、300g 和400酪蛋白 ;试验三 :真胃每天持续灌注葡萄糖和酪蛋白的混合物分别为250g±200g ,250g +300g以及250g +400g。连续7天持续灌注后用农大KB -1型呼吸测热室测定产热和能氮平衡。试验结果表明 ,①试验一、二、三均能明显降低代谢产热率(HP/ME ,P<0.05) ,增加能量沉积效率(Kf值 ,P<0.05) ,并促进体脂肪和体蛋白的沉积(P<0.05)。试验一和试验二的HP/ME和Kf值十分接近 ,表明在降低代谢产热率和提高Kf值方面真胃灌注葡萄糖和酪蛋白混合物的效果是一样的。但从体组织沉积的组成来看 ,灌注酪蛋白肉牛沉积的蛋白质质量比灌注葡萄糖时高68.47 %。②试验三的HP/ME比试验一下降了4.53个百分点(P<0.05) ,比试验二下降了5.17个百分点(P<0.05) ;Kf值比试验一提高了4.78个百分点 ,比试验二提高了4.56个百分点 ,表明真胃灌注葡萄糖和酪蛋白混合物的效果要优于单独灌注其中之一。本试验条件下 ,在降低HP/ME ,增加Kf值方面 ,真胃单独灌注250g葡萄糖和300g
In a 3 comparative feeding experimental design,three steers (375±25kg) fed a maintenance diet of 100% Chinese wildrye hay were intra-rumen infused with VFA mixtures that supplyed above 0.3 times maintenance feeding level and containing acetic,propionic and butyric acids in the molar proportion of 75,15 and 10.In experiment 1,three levels of glucose (100,250 and 400g/day)were continuously infused into the abomasum;In experiment 2,three levels of casein (100,300 and 400g/day)were continuously infused into the abomasum;In experiment 3,three levels of glucose and casein mixture(250+200,250+300 and 250+400g/day)were continuously infused into the abomasum.Heat production,energy and nitrogen balance were evaluated in respiration double chamber (BAU KB-1).The results were showed:the intra-abomasum infusion of glucose,casein and their mixture all significantly decreased HP/ME (P<0.05),increased Kf(P<0.05) and prompted the body fat and protein deposition (P<0.05).There were no differences of HP/ME and Kf between infusion of glucose and casein alone,which demonstrated that intra-abomasum infusion of glucose and casein alone had similar effects on HP/ME and Kf.But the body protein deposition with infusion of casein was 68.4 percent higher than that with infusion of glucose.Compared the infusion of glucose and casein mixture with the infusion of glucose or casein alone,HP/ME decreased by 4.53 percent units(P<0.05) or 4.56 percent units(P<0.05);Kf increased by 4.78 percent units (P<0.05) or 5.17 percent units (P<0.05).It implied that the results of intra-abomasum infusion of glucose and casein mixture was more superior than intra-abomasum infusion of either of them alone.In this study,the optimum infusion levels were 250g/day glucose,300g/day casein alone as well as 250g/day plus 200g/day glucose casein mixture.
出处
《动物营养学报》
CAS
CSCD
2000年第2期14-19,共6页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
国家自然基金重点项目!(项目代号39330170)
关键词
真胃灌注
葡萄糖
酷蛋白
增重效率调控
肉牛
beef cattle
glucose and casein infusion
high acetic acid molar proportion
manipulation of energy conversion
