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Study on absorbed amount and absorption rate of Ca, P and Mg from the digestive tract of ruminants

反刍动物消化道对钙、磷、镁吸收量和吸收率的研究

基本信息

批准号：
63480084
负责人：
KAWASHIMA Ryoji
金额：
$ 3.78万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63480084/
关键词：
sheep Ca P Mg digestive tract absorption 潅流試験リン(P)飼料の物理的形態唾液飼料摂取量

项目摘要

An absorbed amount of Ca, P and M- and absorption rate of these minerals from the digestive tract were studied in ruminants.P was shown to be secreted before the duodenum. The absorbed amount of P, however, was chanced by concentrate-foughage ratio, the amount of feed intake and physical characteristics of feed. The above results indicated that P secretion before the duodenum was thought to be through saliva. Passing amount of P in the duodenum was 2 to 6 times larger than the amount of dietary P and was largely changed by the amount of feed intake, physical form of diet and P status in the animal body. Therefore, the actual P absorption after the duodenum was obviously different from apparent P absorption. The absorbed amount of P after the duodenum was almost equal to the secreted amount of P via saliva. The absorption efficiency of P ranging from 60 to 87% seemed to be affected by P status of livestock. The main absorption site of P was the Lipper part of small intestine and P absor … More ption appeared to be small in the large intestine. P absorption in the small intestine was observed to be affected by flow rate of digesta, and P concentration and pH in digests.It was observed that net Ca absorption occurred before the duodenum when high concentrate diets were fed. Ca secretion was 1 to 2 times of dietary Ca in sheep given high roughage diets, indicating that Ca was secreted via saliva. Ca balance became negative in sheep which secreted a large amount of Ca viasaliva, even though the amount of Ca absorption and Ca absorption efficiency were high.Net Mg absorption Yeas observed before the duodenum in sheep given high concentrate diets. In sheep fed high roughage diets, there was net Mg. absorption before the duodenum although salivary Mg secretion was increased. Unabsorbed Mg before the duodenum was absorbed in the small intestine.Although we are investigating factors affecting Ca and Ma absorption from the digestive tract, adequate answer has not been obtained yet. A formula in which factors affecting Ca, P and Mg metabolism are shown will be made after taking. al all data. Less

研究了反刍动物消化道中Ca、P和M-的吸收量以及这些矿物质的吸收率。显示P在十二指肠之前分泌。而磷的吸收量则受精料比、采食量和饲料物理特性的影响。上述结果表明，十二指肠前的磷被认为是通过唾液分泌的。十二指肠中磷的排出量是日粮磷量的2～6倍，并且很大程度上受采食量、饲料的物理形态和动物体内磷状态的影响。因此，十二指肠后的实际磷吸收量与表观磷吸收量存在明显差异。十二指肠后吸收的磷量几乎等于唾液分泌的磷量。磷的吸收效率在60%至87%之间，似乎受到牲畜磷状况的影响。 P的主要吸收部位是小肠的Lipper部分，而大肠中的P吸收量似乎很小。观察到小肠中磷的吸收受到消化物流速、消化物中磷浓度和pH的影响。观察到，当饲喂高浓缩日粮时，净钙吸收发生在十二指肠之前。高粗饲料喂养的羊的钙分泌量是膳食钙的1至2倍，表明钙是通过唾液分泌的。尽管钙吸收量和钙吸收效率很高，但通过唾液分泌大量钙的羊，钙平衡出现负值。净镁吸收在高精饲料的羊十二指肠前观察到。在饲喂高粗饲料的绵羊中，存在净镁含量。尽管唾液镁分泌增加，但在十二指肠之前吸收。未吸收的镁在十二指肠被小肠吸收之前。虽然我们正在研究影响消化道吸收钙和镁的因素，但尚未得到充分的答案。服用后会形成一个公式，其中显示影响钙、磷、镁代谢的因素。所有数据。较少的