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A Concept of Rate of Food Passage Through the Gastro-Intestinal Tract

U. S. Plant, Soil and Nutrition Laboratory Agricultural Research Division, USDA, Ithaca, New York

Abstract

Data are presented which indicate that flow of ingesta through the animal follows an exponential relation. A model based on a hydraulic flow through two volumes in which complete mixing takes place is proposed. The data indicate that with the rabbit a single volume model is adequate and that a single half time is sufficient to describe the flow of feed residues. Data from previously published work by Balch are presented to support the premise that in the ruminant a two volume model describes the observed data and that two half times are sufficient to describe the flow of feed residues in the ruminant.