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Role of the omasum in the control of digesta flow from the reticulo-rumen

Published online by Cambridge University Press:  05 November 2021

A. Afzalzadeh ,
F.D.DeB. Hovell  and
D.J. Kyle
A. Afzalzadeh
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB
F.D.DeB. Hovell
Affiliation:
University of Aberdeen Dept of Agriculture, 581 King Street, Aberdeen AB24 5UA
D.J. Kyle
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB
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Extract

Functions suggested for the omasum include: Water, VFA and electrolyte absorption, (Engelhardt and Hauffe 1975), and physically aiding digesta flow (Stevens et al, 1960). Moir (1984) suggested absorption of VFA and buffer would reduce the abomasal HCl secretion necessary to reduce digesta pH. Therefore it seemed to us that the omasum might also control the reticulo-omasal orifice and regulate digesta flow. The objective of the work reported here was to test whether the stimuli of osmotic pressure (OP) or VFA to the omasum would affect the passage of digesta from the reticulo-rumen.

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Proceedings of the British Society of Animal Science , Volume 1997 , 1997 , pp. 127
Copyright
Copyright © British Society of Animal Science 1997

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References

Engelhardt, W. V. and Hauffe, R. 1975. Role of the omasum in absorption and secretion of water and electrolytes, in sheep and goats. In: Digestion and Metabolism in the Ruminant. Proceedings of the IV International Symposium on Ruminant Physiology, Sydney, Australia, 1974. Ed. McDonald, I.W. & Warner, AC.I., pp 216–230.Google Scholar
Stevens, C.E., Sellers, A.F and Spurrell, F. A. (1960). Function of the bovine omasum in ingesta transfer. American Journal of Physiology 198: 449–455.CrossRefGoogle ScholarPubMed
Moir, R.J. 1984. Why an omasum? In: Ruminant Physiology, Concepts and Consequences. Ed. Baker, S.K., Gawthorne, J.M., Mackintosh, J.B. and Burser, D.B.. pp 85–92..Google Scholar