Studies on lipid digestion in the preruminant calf. The source of lipolytic activity in the abomasum
- 1 November 1976
- journal article
- research article
- Published by Cambridge University Press (CUP) in British Journal of Nutrition
- Vol. 36 (3), 439-447
- https://doi.org/10.1079/bjn19760098
Abstract
1. Lipolytic and proteolytic activities and pH values were determined in secretions collected from innervated abomasal pouches and in abomasal contents from preruminant calves given liquid diets.2. No lipolytic activity was detected in pouch secretions collected during 1 h after feeding, though lipolytic activity was present in abomasal contents; pepsin (EC 3.4.23.1) and rennin (EC 3.4.23.4) were present in both pouch secretions and abomasal contents. The pH values of pouch secretions ranged from 1.2 to 1.8 and those of abomasal contents from 4.2 to 5.9.3. When diet was placed directly into the abomasal pouch soon after feeding, the pH values of pouch and abomasal contents decreased similarly (i.e. from 6.3 to approximately 5). Protease activity (U/ml) of pouch contents ranged from 0.1 to 0.8 and that of abomasal contents from 0.1 to 0.2. No lipolytic activity was detected in pouch contents, though abomasal contents contained 0.6 to 1.2 U/ml and when the diet contained milk-fat as the dietary fat source considerable lipolysis of triglycerides containing shorter-chain fatty acids was found.4. It is concluded that there is no significant secretion of lipolytic enzymes by the fundal mucosa and that the lipolysis of triglycerides in the abomasum of the preruminant calf is due predominantly to a lipolytic enzyme in saliva.This publication has 16 references indexed in Scilit:
- Lingual Lipase and Its Role in the Digestion of Dietary LipidJCI Insight, 1973
- The Lipase of Rat Gastric MucosaGastroenterology, 1970
- Evidence for a Lipase System in Canine Gastric JuiceThe American Journal of the Medical Sciences, 1968
- The activity of human gastric lipase towards p-nitrophenyl estersClinica Chimica Acta; International Journal of Clinical Chemistry, 1965
- Lipolysis of Milk Fat by Pregastric Esterase in the Abomasum of the CalfJournal of Dairy Science, 1964
- Role of Pregastric Esterase in the Abomasal Hydrolysis of Milk Fat in the Young CalfJournal of Dairy Science, 1961
- Esterolytic Activity of Certain Alimentary and Related Tissues from Cattle in Different Age GroupsJournal of Dairy Science, 1956
- Some esterases of the ratBiochemical Journal, 1954
- The Gastric Lipase in ManActa Physiologica Scandinavica, 1946
- On the Activation of Pancreatic Lipase by Calcium Chloride at Varying pHActa Physiologica Scandinavica, 1945