蛋白质补充料来源对肉牛日粮淀粉瘤胃发酵和小肠消化的影响

Effects of Supplemental Protein Source in Diets of Steers on Ruminal Fermentation and Postruminal Digestion of Starch

为了研究日粮蛋白质补充料来源对肉牛日粮淀粉瘤胃发酵和小肠消化的影响,选择体重600kg左右的荷斯坦(Holstein)公牛3头,安装瘤胃、真胃瘘管,按3×3拉丁方实验设计分别饲喂以豆粕、全脂大豆、过瘤胃蛋白质料为蛋白质补充料来源的3种不同日粮,以三氧化二铬(Cr2O3)作真胃食糜标记物,全收粪法收集粪样,测定真胃食糜和粪中的淀粉流量及在瘤胃内、真胃后段消化道(简称肠道)的表观消化率。结果表明:日粮蛋白质补充料来源对瘤胃及全消化道的淀粉表观消化率没有显著影响(P>0.05),瘤胃和全消化道淀粉的表观消化率分别为78.65%和97.19%。

The objectives of this experiment were to quantify the effects of feeding protein supplements with different source on starch out of the rumen and its total tract apparent digestihilities. For this purpose, 3 Holstein steers fistulated in the rumen and abomasum were used in a 3 × 3 Latin square design at three treatments with three sources of CP （solvent-extracted soybean meal, soybean and bypass protein meal respectively）. Starch digestibility in the rumen and total tract did not differ（P〉0.05） among different treatments The results showed supplement protein source did not affected the extent of digestion of starch.