饲料蛋白组分对反刍家畜常用饲料小肠吸收蛋白质含量的影响

The Relationship Between Intestinal Digestibility of Crude Protein and Dry Matters and the Protein Fractions with Ruminant Feedstuffs

为研究反刍动物常用饲料的小肠干物质和粗蛋白质消化规律,探索评价饲料小肠可吸收蛋白的简易操作方法。使用康奈尔净碳水化合物和净蛋白质体系的蛋白评价方法对11种反刍动物常用饲料蛋白组分进行分类,采用移动尼龙袋法测定饲料瘤胃非降解蛋白在小肠中的消化率。结果表明,饲料原料在瘤胃发酵16 h后,干物质的瘤胃降解率主要与饲料中NDF含量和PB3含量有关,粗蛋白的瘤胃降解率主要受NDF含量和结合蛋白质PC含量影响。小肠可吸收干物质的含量主要受饲料中PA含量影响;小肠可吸收蛋白质含量随着饲料原料中NDF含量的增多而增加,与PA含量呈较高的负相关。由此可见,不同饲料瘤胃降解和消化特性不同,饲料蛋白组分对瘤胃降解与小肠消化的评价具有重要意义。

The study was to find out the relationship between the contents of each protein fractions and the degradation and the digestibility of 11 feeds common used in China.Chemical contents were determined according to the methods provided by CNCPS Version 5.0.The mobile nylon bag technique was used to investigate the apparent small intestinal digestibility of crude protein（CP） and dry matters（DM）.Three dairy cows fitted with permanent ruminal cannulas and T-type duodenal cannulas were used to investigate intestinal digestibility of CP and DM by mobile nylon bag technique in soybean meal（SBM）,cottonseed meal（CSM）,rapeseed meal（RSM）,peanut meal（PM）,flaxseed meal（FSM）,linseed meal（LSM）,distillers dried grains（DDGS）,expanded soybean（ES）,corn grain（CG）,brewer′s grains（BG）,alfalfa hay（AH）,chinese wildrye（CW） and whole corn silage（WCS）.The content of undegraded protein after 16 h incubation was affected by the NDF and PB3 fractions.The content of RUP have a high relationship with contents of the NDF and PA fractions.The absorbed DM increased while the feeds have more NDF.The protein content absorbed in the intestine can be mainly predicted by the NDF and PC content.In our result,we can see that the intestinal absorbed DM and CP have a high relationship with the content of each protein fractions,the potential of each feedstuffs that can provide for animal intestinal protein were dissimilar,and the potential that can provide for animal with intestinal protein.