Moseley G, Jones J R
Br J Nutr. 1984 Sep;52(2):381-90. doi: 10.1079/bjn19840104.
Sheep were fed once daily with 300 or 600 g dried perennial ryegrass (Lolium perenne) or white clover (Trifolium repens). Total rumen contents were sampled once daily at various intervals up to 24 h after feeding for 6 d. Total weight of fresh rumen contents and dry matter (DM), organic matter and particulate matter concentrations were measured and the particle size distribution of rumen contents was analysed using a wet sieving technique. There was a similar exponential loss of DM from the rumen with time after feeding for both perennial ryegrass and white clover. The rate of DM disappearance during the first 3 h after feeding was ten times greater for the higher intake and seven times greater for the lower intake than during the subsequent 21 h. The percentage of particulate material disappearing during the first 3 h was greater for white clover (57%) than for perennial ryegrass (49%). Particle size distribution analysis of rumen contents showed that the most rapid rate of particle size reduction occurred during the first 3 h after feeding. Despite a rapid rate of breakdown there was no increase in the total weight of small particles in the rumen. The rate of reduction in particle size during this period was greater for white clover than perennial ryegrass. Microscopic examination of rumen particles showed a difference in particle geometry between white clover and perennial ryegrass which appeared to be related to anatomical features of the plant.
给绵羊每天喂食一次300克或600克干多年生黑麦草（黑麦草）或白三叶草（白车轴草）。在6天的喂食期间，每天在喂食后长达24小时的不同时间间隔采集一次瘤胃内容物总量样本。测量新鲜瘤胃内容物的总重量以及干物质（DM）、有机物和颗粒物浓度，并使用湿筛技术分析瘤胃内容物的粒度分布。多年生黑麦草和白三叶草在喂食后瘤胃中DM随时间的损失呈相似的指数下降。喂食后前3小时的DM消失率，高摄入量组比随后21小时高10倍，低摄入量组比随后21小时高7倍。白三叶草在喂食后前3小时消失的颗粒物质百分比（57%）高于多年生黑麦草（49%）。瘤胃内容物的粒度分布分析表明，喂食后前3小时粒度减小的速度最快。尽管分解速度很快，但瘤胃中小颗粒的总重量没有增加。在此期间，白三叶草的粒度减小速度比多年生黑麦草快。瘤胃颗粒的显微镜检查显示，白三叶草和多年生黑麦草在颗粒几何形状上存在差异，这似乎与植物的解剖特征有关。
