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Mechanical stimulation of rumination in sheep by the intraruminal addition of inert fibre particles

Published online by Cambridge University Press:  02 September 2010

D. P. Campion  and
B. F. Leek
D. P. Campion
Affiliation:
Department of Veterinary Physiology and Biochemistry, University College, Dublin, Veterinary College, Dublin 4, Ireland
B. F. Leek
Affiliation:
Department of Veterinary Physiology and Biochemistry, University College, Dublin, Veterinary College, Dublin 4, Ireland
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Abstract

Inert fibre particles were used in a series of experiments in order to quantify the effects of some physical characteristics of dietary long fibre on rumination. Removal of hay from the diet of hay I concentrate-fed sheep reduced true rumination to zero after a period of 8 days, although pseudorumination, much reduced in duration, persisted. Then by introducing loose, chopped, inert polyethylene particles through a rumen cannula, rumination was restored. When different masses of loose inert polyethylene particles chopped into 10-mm lengths were placed in the rumen, the time spent ruminating was found to be directly proportional to mass of fibre placed in the rumen (P < 0·001). By inserting a fixed mass of particles of different lengths, the optimum length of inert fibre for rumination to occur was found to lie between 7 and 30 mm. Finally, when, in place of loose fibre, a polyethylene fibre ‘pompom’, fixed on a rod, was introduced via the cannula and placed so as to brush different areas of the retkulorumen, it was found that the greatest rumination response was evoked when the pompom was allowed to stimulate mechanically the cranial regions of the retkulorumen (P < 0·05). It is concluded that inert polyethylene fibre mimicked the peripheral excitatory effects of dietary fibre by stimulating mechanoreceptors (epithelial receptors) located in the cranial portions of the retkulorumen. Adding about 50 g of 7 to 30 mm inert fibre caused sheep on low-fibre diets to ruminate normally for over 3 h.

Keywords

fibremechanoreceptorsrumen epitheliumruminationsheep
Type
Research Article
Information
Animal Science , Volume 62 , Issue 1 , February 1996 , pp. 71 - 77
Copyright
Copyright © British Society of Animal Science 1996

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