The effect of different diets including those containing soya-bean products, on digesta movement and water and nitrogen absorption in the small intestine of the pre-ruminant calf.

摘要: 1. Preruminant calves, fistulated in the abomasum and distal ileum, were given by infusion into abomasum, at intervals of 2–3 d, single experimental feeds cow's milk or a synthetic diet which protein source was casein soya-bean product. Polyethylene glycol (PEG) phenol red included as markers. 2. After feed, measurements made transit time from proximal duodenum to ileum mean ileal flow-rates for first 3 21 h after food residues reached ileum. PEG recoveries these two periods net nitrogen absorption up also determined. In some experiments sodium, potassium magnesium concentrations numbers viable bacteria digesta 3. Measurements passage digesta, recovery marker N did not differ greatly between calves containing casein. Compared casein-based diet, based on heated flour calf second produced somewhat higher flow-rate significantly lower absorption. Net even when received unheated flour. 4. Calves several occasions appeared develop sensitivity flour, further it they had rates flow (accompanied correspondingly high Na K flow), small intestine times values than similarly fed unsensitized calves. They few hours indicating inhibition abomasal emptying. Over all, changes indicated severe disturbance digestive function caused abnormal bacterial growth may have been due gastrointestinal allergy. 5. Diets prepared water-extracted soya-bean-protein isolate led disturbances sensitized but those concentrates extracting meal with hot aqueous ethanol not.