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Density and Size as Factors Affecting Passage Rate of Ingesta in the Bovine and Human Digestive Tracts¹

Department of Bichemistry and Nutrition, Virginia Agricultural Experiment Station, Blacksburg

ABSTRACT

Effect of density and size of the passage rate of particles through the digestive tract of cattle and humans has been estimated, using inert plastic particles. An optimum (maximum passage rate) in density at approximately 1.2 gm./cm.³ and in size between 20 and 30 x 10^–3 cm.³ has been observed.

The excretion pattern of chromic oxide by cattle has been found to follow the equation y = ab^x, in general, but the rate of passage is faster than would be predicted from its size and density. The significance of this equation and of a pronounced shoulder in the excretion curve has been discussed.

¹ Contributing to Southern Regional Project S-12.

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