Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-18T12:05:04.940Z Has data issue: false hasContentIssue false
  • English
  • Français

Studies on lipid digestion in the preruminant calf. The source of lipolytic activity in the abomasum

Published online by Cambridge University Press:  09 March 2007

Joyce Toothill ,
S. Y. Thompson  and
J. D. Edwards-Webb
Joyce Toothill
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
S. Y. Thompson
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
J. D. Edwards-Webb
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 36 , Issue 3 , November 1976 , pp. 439 - 447
Copyright
Copyright © The Nutrition Society 1976

References

Aldrich, W. N. (1954). Biochem. J. 57, 692.CrossRefGoogle Scholar
Anson, M. L. (1938). J. gen. Physiol. 22, 79.CrossRefGoogle Scholar
Barrowman, J. A. & Darnton, S. J. (1970). Gastroenterology 59, 13.CrossRefGoogle Scholar
Clark, S. B., Brause, B. & Holt, P. R. (1969). Gastroenterology 56, 214.CrossRefGoogle Scholar
Cohen, M., Morgan, R. G. H. & Hofmann, A. F. (1971). Gastroenterology 60, 1.CrossRefGoogle Scholar
Edwards-Webb, J. D. (1975). J. Sci. Fd Agric. 26, 1943.CrossRefGoogle Scholar
Engstrom, J. F., Rybak, J. J., Duber, M. & Greenberger, N. J. (1968). Am. J. med. Sci. 256, 346.CrossRefGoogle Scholar
Grosskopf, J. F. W. (1965). Onderstepoort J. vet. Res. 32, 153.Google Scholar
Hamosh, M. & Scow, R. D. (1973). J. clin. Invest. 52, 88.CrossRefGoogle Scholar
Hill, K. J. (1970). In Duke's Physiology of Domestic Animals, 8th ed., p. 382 [Swenson, M. J. editor]. Ithaca NY: Cornell University Press.Google Scholar
Hill, K. J. & Gregory, R. A. (1951). Vet. Rec. 63, 647.Google Scholar
Jensen, R. G., Marks, T. A., Sampugna, J., Quinn, J. G. & Carpenter, D. L. (1966). Lipids 1, 451.CrossRefGoogle Scholar
Otterby, D. E., Ramsey, H. A. & Wise, G. H. (1964 a). J. Dairy Sci. 47, 993.CrossRefGoogle Scholar
Otterby, D. E., Ramsey, H. A. & Wise, G. H. (1964 b). J. Dairy Sci. 47, 997.CrossRefGoogle Scholar
Popiela, T., Szafran, H. & Szafran, Z. (1965). Clinica chim. Acta 11, 283.CrossRefGoogle Scholar
Ramsey, H. A., Wise, G. H. & Tove, S. B. (1956). J. Diary Sci. 39, 1312.CrossRefGoogle Scholar
Ramsey, H. A. & Young, J. W. (1961). J. Dairy Sci. 44, 2227.CrossRefGoogle Scholar
Schønheyder, F. & Volqvartz, K. (1945). Acta physiol., scand. 10, 62.CrossRefGoogle Scholar
Schønheyder, F. & Volqvartz, K. (1946). Acta physiol., scand. 11, 349.CrossRefGoogle Scholar