Studies on intestinal digestion in the sheep
Studies on intestinal digestion in the sheep
复制标题
绵羊肠道消化的研究
DOI：
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发表时间：
1970
影响因子：
3.6
通讯作者：
D. Armstrong
中科院分区：
文献类型：
--
作者：
E. Pfeffer;A. Thompson;D. Armstrong
1.在三个实验中的每一个中，两只绵羊被给予由干草、或两份干草对一份大麦或一份干草对两份大麦组成的饮食。每只绵羊配备有进入瘤胃的套管和进入近端十二指肠和末端回肠的折返套管。补充含有大麦的口粮，以调整钙、磷、镁、钠和钾的摄入量，使其达到与全干草口粮相似的水平。用氧化铬（Cr2O3）浸渍纸每天两次通过瘤胃瘘管。2.测量了进入和离开小肠以及在粪便中排泄的粗灰分和五种矿物质的量。调整通过凹式套管的量以得到100%的氧化铬回收率。这些值用于计算元素通过消化道三个主要部分壁的方向和净运动。3.在所有的情况下，有一个广泛的净分泌的Na和P之间的口和小肠，净吸收的K和P从小肠和Na从大肠。4. Ca和Mg的净移动量很小，而且变化很大。在五的六个观察有一个小的净分泌的钙和小净吸收的镁在通过期间的腹杆通过网状rurnen，omasurn和皱胃。Ca和Mg的净分泌明显发生在小肠，Mg的净吸收发生在大肠。5.饮食间唯一的差异是钠和钾的净运动的微小差异。
1. In each of three experiments, two sheep were given diets consisting of hay, or two parts hay to one part barley or one part hay to two parts barley. Each sheep was equipped with a cannula into the rumen and re-entrant cannulas into the proximal duodenum and the terminal ileum. The rations containing barley were supplemented to adjust the intake of calcium, phosphorus, magnesium, sodium and potassium to a level similar to that in the all-hay ration. Paper impregnated with chromic oxide (Cr2O3) was given twice daily by rumen fistula. 2. Amounts of crude ash and the five minerals entering and leaving the small intestine and excreted in the faeces were measured. The amounts passing through the re-entrant cannulas were adjusted to give 100% recovery of chromic oxide. The values were used to calculate the direction and net movements of the elements through the walls of the three main parts of the alimentary tract. 3. In all instances there was an extensive net secretion of Na and P between mouth and small intestine, net absorption of K and P from the small intestine and of Na from the large intestine. 4. The net movements of Ca and Mg were small and rather variable. In five of the six observations there was a small net secretion of Ca and small net absorption of Mg during passage of the digesta through the reticulo-rurnen, omasurn and abomasurn. Net secretion of Ca and Mg apparently occurred in the small intestine and net absorption of Mg in the large intestine. 5. The only between-diet differences were small differences in net movements of Na and K.