The removal of glucose, maltose and different starches from the small intestines of steers.
Four Friesian steers (103-150 kg) each equipped with simple abomasal and re-entrant ileal cannulas were used. Different amounts of glucose, maltose or one of several isolated starches or ground cereal grains, ranging from 80-400 g/8 h, together with polyethylene glycol were infused into the abomasums and absorption up to the ileum examined. The efficiency of removal of glucose remained high at all levels of infusion (greater than 80%) and at the highest level, 26.4 g glucose/kg body weight 0.75/d were calculated to be removed in the small intestines. At low levels of infusions, maltose was removed almost as efficiently as glucose, but the capacity of the small intestines to remove maltose was exceeded with infusions above 15 g/kg body weight 0.75/d. Soluble and isolated wheat starch were removed to similar extents and almost identically to maltose. Isolated maize starch, whilst being removed in the small intestines almost as rapidly as maltose at the lowest level of infusion, was less efficiently removed at higher levels. Rice and potato starches were poorly removed in the small intestines. Intestinal capacities for the removal of related wheat, soluble starch, maize, rice and potato starches were 102, 99, 80, 77 and 55% that of equivalent amounts of maltose. Starch in ground cereal grains (maize and wheat) were removed in the small intestines slightly less efficiently (75-90%) than the corresponding isolated starches.
D000818:Animals; D002417:Cattle / Q000378:metabolism*; D002852:Chromatography, Ion Exchange; D004063:Digestion; D002523:Edible Grain; D005766:Gastrointestinal Contents / Q000032:analysis; D005947:Glucose / Q000378:metabolism*; D007408:Intestinal Absorption; D007421:Intestine, Small / Q000378:metabolism*; D008297:Male; D008320:Maltose / Q000378:metabolism*; D011092:Polyethylene Glycols; D013213:Starch / Q000378:metabolism*
D011092:Polyethylene Glycols; D008320:Maltose; D013213:Starch; D005947:Glucose