Is gut permeability affected by age and soyabean antigenicity in the preruminant calf?

Digesta movement and gut motility in the preruminant calf.

Assessment of gastrointestinal permeability to small marker probes in the preruminant calf.

The intestinal permeability to markers was assessed in preruminant calves fed different milk substitutes containing skimmed milk powder or whey and soyabean products of differing antigenic activity as the protein sources. In Experiment 1, the 6 h urinary excretion of lactulose transiently decreased with the antigenic soyabean product but not that of sucrose of D-mannitol. In Experiment 2, the 6...

Problems in the nutrition of the preruminant calf.

Mortality Perinatal mortality (stillbirths and deaths within 12-24 h of birth) is about 3% and tends to be higher for breeds of extreme size. For large breeds perinatal mortality is associated with difficulties at parturition caused by a disproportionate increase in size of the calf relative to that of the dam (Monteiro, 1969) whereas for small breeds it tends to be associated with weak calves,...

Circadian changes in the abomasal secretions of the preruminant calf

The purpose of this study was to investigate the circadian changes in the abomasal secretions (quantities of juice, enzymes and electrolytes) of the preruminant calf. The gastric juice was collected every hour from five calves fitted with an innervated abomasal pouch and given milk twice daily, with a 7-h interval between the morning and the evening meals. The amounts of gastric secretions prod...

Digestion of allergenic soya protein in the preruminant calf.