Faecal and ileal digestibility in the dog of diets rich in wheat or tapioca starch.

摘要

Ileal and faecal digestibilities of raw and gelatinized starch from wheat and tapioca were compared in 12 adult Beagle dogs separated into 2 groups. The measurement of ileal digestibilities was performed in 4 dogs fitted with a simple T cannula. ThepH of the ileal digesta and the faeces were measured. The basal diets were formed using a balanced moist diet rich in animal proteins to which was added the source of starch (about 50% of DM), providing 22 g dry matter/kg live weight and 4.8 g crude protein/kg live weight. Gelatinization had no effect on faecal and ileal digestibilities of wheat starch but improved that of tapioca starch. Faecal digestibility of raw tapioca starch was 98.4% compared with 100%, 100% and 99.8% for raw wheat starch, gelatinized wheat starch and gelatinized tapioca starch, respectively. Ileal digestibility of raw tapioca starch (57.6%) was also lower (P<0,5) than that of the other sources of starch (99.4%, 98.0% and 97.4% for raw wheat starch, gelatinized wheat starch andgelatinized tapioca starch respectively). Ileal pH decreased with time after the meal and reached a value similar to that for the faeces. The intensity of the reduction was greater for diets with untreated starch.