Abstract

When added to a fibre-free diet, polyethylene, a substance not modified in the digestive tract and devoid of water-holding capacity, reduces mean transit time (MTT) in the gut of the growing pig from 101.3 to 88.8 h and increases faecal water excretion from 2 to 43 g day −1. It does not modify the digestibility of the other components of the diet. However, with the same amount of added wheat bran, more pronounced effects (MTT: 75.7 h; daily faecal water output: 119 g) are observed. The mechanical properties of indigestible material, therefore, only partly explain its effect on transit time and faecal excretion in the pig.

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