Does the Pancreas Secrete Digestive Enzymes Individually or in a Group?

Independent secretion of different digestive enzymes by the pancreas.

Pancreatic secretion was collected from the cannulated duct of anesthetized rabbits during the perfusion of the upper duodenum with a balanced salt solution with or without 5 mM glucose. The secretion of amylase, chymotrypsinogen, trypsinogen, and total protein was measured. While glucose did not increase overall digestive enzyme secretion, it did change the proportions of the enzymes in secret...

Growth performance and digestive and metabolic responses of gilts penned individually or in groups of four.

Two experiments were conducted to identify factors involved in the growth retardation of pigs housed in groups. In each experiment, 60 gilts were allotted to two treatments in a randomized complete block design. Twelve gilts were penned individually with one feeder, one waterer, and a space allowance of 1.5 m2 per pen. Forty-eight gilts were allocated to 12 groups of four and penned together wi...

Growth Performance and Digestive and Metabolic Responses of Finishing Gilts Penned Individually or in Groups

Digestive Enzymes in Marine Species

The proteolytic activities of the digestive tract of three carnivorous fish species (Sebastes mentella, Scophthalmus maximus, Sparus aurata) have been studied. The activity found in the stomach showed a pH optimum of 2.0 for all species, whereas this was in the alkaline range (9.5-10.0) in the intestinal extracts. Similar optimal temperature was measured for all species, although higher residua...

Digestive enzymes in the germ-free animal.

The digestive physiology of the germ-free animal has a number of characteristics (cecal hypertrophy, slower small intestine cell renewal, slower gastric emptying and intestinal transit) which distinguish it from that of the conventional animal. If the germ-free model is to be used to determine the role of gastrointestinal microflora in the nutrition of the conventional animal, it is essential t...