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Nitrogen flow in the legume forage plants-ruminant production system.

豆科饲料植物-反刍动物生产系统中的氮流。

基本信息

批准号：
08660325
负责人：
SUGAWARA Kazuo
金额：
$ 1.34万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08660325/
关键词：
White clover Ruminant production Palatability Legume saponin Ruminal Digestion Nitrogen cycle 反芻動物

项目摘要

White clover (WC) is one of the useful legume forage plants which has high nitrogen fixing ability and high protein concentration. But it also contains legume saponins which were known as bloat-inducing substances. This investigated palatability of WC by ruminant, foam stability of ruminal contents after ingestion of WC,protein digestivility of WC,rumen motility, flow-rate of plant protein from rumen to lower digestive organs (rumen-bypass-protein) and etc.under viewpoints of nitrogen flow.(1).Under the concurrent feeding of WC and orchardgrass (OG), a great much of WC was ingested when eating activity of animals was high. and foam stability of ruminal fluid became high, But when was normal level, both WC and OG were ingested equally, and foam stability was kept lower.(2).In 2 hour after feeding WC,foam stavility of ruminal fluid became high remarkably, and the concentrations of volatile fatty acid and NH_4-N increased distinctly. The frequency of ruminal contraction increase and amplitude of rumen motility was small in ruminants under WC feeding compared with OG feeding.(3).There was positive relation between foam stability and saponin concentration in ruminal fluid. Also saponins were decomposed by ruminal microorganism. The foam formed in rumen in the WC ingestion might depress an abrupt ruminal fermentation and showed function increasing rumen-bypass-nitrogen.

白色三叶草（WC）是一种具有高固氮能力和高蛋白含量的豆科牧草。但它也含有豆类皂苷，这被称为膨胀诱导物质。本研究从氮流的角度出发，研究了反刍动物对WC的适口性、采食WC后瘤胃内容物的泡沫稳定性、WC的蛋白质消化率、瘤胃运动性、植物蛋白从瘤胃向下消化器官的流动速率（过瘤胃蛋白）等。（1）在WC和鸭茅（OG）同时投喂的情况下，当动物摄食活动高时，WC的摄食量大。而在正常水平时，WC和OG均被摄入，泡沫稳定性较低。（2）饲喂WC后2 h，瘤胃液泡沫稳定性显著提高，挥发性脂肪酸和NH_4-N浓度显著升高。与OG相比，WC饲喂下反刍动物瘤胃收缩频率增加和瘤胃运动幅度较小。（3）泡沫稳定性与瘤胃液中皂甙浓度呈正相关。瘤胃微生物也能降解皂苷。瘤胃内形成的泡沫可抑制瘤胃内的突然发酵，具有提高过瘤胃氮的作用。