[Digestion of milk proteins in the abomasum of the preruminant calf. Gastric evacuation after a test meal].
In this study, we used fasted, preruminant calves fitted with a double proximal cannula in the duodenum; gastric evacuation was investigated by recovering products leaving the abomasum after a test meal. Five types of meal were given: whole milk, skimmed milk, casein solution in water, casein solution in a mineral medium simulating the permeate of highly-filtered milk, and whey. Gastric emptying of nitrogen was relatively slow. The coagulation of "milk diets" slowed down this emptying. Precipitation of "casein diets" at acid pH also slowed down emptying, but to a lesser degree. The "casein diets", more proteolyzed than the "milk diets", released larger amounts of non-protein nitrogen (NPN) into the intestine. Calcium emptying was highly related to NPN emptying, demonstrating the important role of acid peptides (phosphopeptides) from casein hydrolysis.
D000018:Abomasum / Q000502:physiology*; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002364:Caseins / Q000378:metabolism; D002417:Cattle / Q000502:physiology*; D004063:Digestion; D005746:Gastric Emptying; D007785:Lactose / Q000378:metabolism; D008892:Milk / Q000378:metabolism; D008894:Milk Proteins / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism
D002364:Caseins; D008894:Milk Proteins; D007785:Lactose; D009584:Nitrogen; D002118:Calcium
Digestion des protéines du lait dans la caillette du veau préruminant. Evacuation gastrique après un repas d'épreuve.