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Food intake and ruminal osmolality in sheep: differentiation of the effect of osmolality from that of the products of maize silage fermentation

Published online by Cambridge University Press:  27 March 2009

L. E. Phillip ,
J. G. Buchanan-Smith  and
W. L. Grovum
L. E. Phillip
Affiliation:
University of Ouelph, Ouelph, Ontario, Canada N1O 2W1
J. G. Buchanan-Smith
Affiliation:
University of Ouelph, Ouelph, Ontario, Canada N1O 2W1
W. L. Grovum
Affiliation:
University of Ouelph, Ouelph, Ontario, Canada N1O 2W1
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Summary

Five rumen-cannulated Cheviot lambs were used in two successive experiments to differentiate the effect of osmolality from the specific effects of the soluble compounds in maize silage on voluntary intake and ruminal motility. In Expt 1, extracts from fresh (FCE) and ensiled (CSE) maize were adjusted to pH 6·5 andtonicities of 200, 400, 800, and 1600 m-osmol/kg with NaCl, then infused into the rumen according to a 5×5 repeated latin-square design. Water was infused as the control. In Expt 2 solutions of NaCl, with tonicities similar to those in Expt 1, were also infused into the rumen. The lambs were fed ad libitum a diet of pelleted lucerne, but on the morning of infusion they were deprived of food for 4 h and infused continuously for 4 h commencing after 1 h of food deprivation. The infusion of FCE and CSE resulted in no significant difference in cumulative dry matter (D.M.) intake. However, increasing the tonicities of the infusates caused a linear increase (P < 0·05) in ruminal osmolality and a corresponding linear reduction in food intake during the first 30 min of feeding. Infusion of NaCl alone produced a similar effect on intake. The linear regression coefficients of food intake (Y) (g D.M./kg W0·75) against rumen osmolality (X) (m-osmol/kg) were –0·077±0·0085 (r2 = 0·78), –0·082±0·0095 (r2 = 0·76) and –0·073±0·0065 (r2 = 0·84) for FCE, CSE and NaCl, respectively, with no significant differences among the infusates. The frequencies of ruminal contractions during the infusion of FCE and CSE were similar (P > 0·05) and were unaffected (P > 0·05) by ruminal osmolality up to 550 m-osmol.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 96 , Issue 2 , April 1981 , pp. 439 - 445
Copyright
Copyright © Cambridge University Press 1981

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References

REFERENCES

Ash, R. W. (1959). Inhibition and excitation of reticulorumen contractions following the introduction of acids into the rumen and abomasum. Journal of Physiology 147, 58–73.CrossRefGoogle ScholarPubMed
Baile, C. A. & Forbes, J. M. (1974). Control of food intake and regulation of energy balance in ruminants. Physiological Reviews 54, 160–214.CrossRefGoogle Scholar
Bergen, W. G. (1972). Rumen osmolality as a factor in feed intake control of sheep. Journal of Animal Science 34, 1054–1060.CrossRefGoogle ScholarPubMed
Clancy, M., Wangsness, P. J. & Baumgardt, B. R. (1977). Effect of silage extract on voluntary intake, rumen fluid constituents and rumen motility. Journal of Dairy Science 60, 580–590.CrossRefGoogle Scholar
Harding, R. H. & Leek, B. F. (1972). Rapidly adapting mechanoreceptors in the reticulo-mmen which also respond to chemicals. Journal of Physiology 223, 32–33.Google ScholarPubMed
Harper, A. E. & Spivey, H. E. (1958). Relationship between food intake and osmotic effect of dietary carbohydrate. American Journal of Physiology 193, 483–487.CrossRefGoogle ScholarPubMed
Houpt, T. E., Anika, S. M. & Houpt, K. A. (1979). Preabsorptive intestinal satiety controls of food intake in pigs. American Journal of Physiology 236, R328–337.Google ScholarPubMed
Leek, B. F. & Harding, R. H. (1975). Sensory nervous receptors in the ruminants stomach and the reflex control of reticulo-ruminal motility. In Digestion and Metabolism in the Ruminant (ed. McDonald, I. W. and Warner, A. C. I.), pp. 60–76. Armidale, Australia: University of New England Publishing Unit.Google Scholar
Phillip, L. E., Buchanan-Smith, J. G. & Grovum, W. L. (1981). Effects of infusing the rumen with acetic acid and nitrogenous constituents in maize silage extracts on food intake, ruminal osmolality and blood acid–base balance in sheep. Journal of Agricultural Science, Cambridge 96, 429–438.CrossRefGoogle Scholar
Smith, M. H. (1966). Effects of hypertonic preloads on concurrent eating and drinking. Journal of Comparative and Physiological Psychology 61, 398–401.CrossRefGoogle ScholarPubMed
Steel, R. G. D. & Torrie, J. H. (1960). Principles and Procedures of Statistics. New York: McGraw-Hill.Google Scholar
Ternouth, J. H. (1967). A factor limiting the ruminant's voluntary consumption of silage. Journal of Australian Institute of Agricultural Science 33, 263–264.Google Scholar
Ternouth, J. H. & Beattie, A. W. (1971). Studies of the food intake of sheep at a single meal. British Journal of Nutrition 25, 153–164.CrossRefGoogle Scholar
Thomas, J. W., Moore, L. A., Okamoto, M. & Sykes, J. F. (1961). A study of factors affecting rate of intake of heifers fed silages. Journal of Dairy Science 44, 1471–1483.CrossRefGoogle Scholar
Warner, A. C. I. & Stacey, B. D. (1977). Influence of ruminal and plasma osmotic pressure on salivary secretion in sheep. Queensland Journal of Experimental Physiology 62, 133–142.CrossRefGoogle ScholarPubMed