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Digestion of milk protein in the abomasum of pre ruminant calf gastric evacuation after a test meal


Reproduction Nutrition Developpement 23(2): 161-174
Digestion of milk protein in the abomasum of pre ruminant calf gastric evacuation after a test meal
Fasted, preruminant calves fitted with a double proximal cannula in the duodenum were used; 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 N 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 nonprotein N (NPN) into the intestine. Ca emptying was highly related to NPN emptying, demonstrating the important role of acid peptides (phosphopeptides) from casein hydrolysis.


Accession: 005161581



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