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Rumen fermentation patterns in sheep receiving silages of different chemical composition supplemented with concentrates rich in starch or in digestible fibre

Published online by Cambridge University Press:  27 March 2009

P. A. Martin ,
D. G. Chamberlain ,
S. Robertson  and
D. Hirst
P. A. Martin
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, UK
D. G. Chamberlain
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, UK
S. Robertson
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, UK
D. Hirst
Affiliation:
Scottish Agricultural Statistics Service, The University of Edinburgh, James Clerk Maxwell Building, The King's Buildings, Edinburgh EH9 3JZ, UK
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Summary

In each of two experiments, eight silages supplemented with concentrates containing a high proportion of either starch or digestible fibre were given to rumen-cannulated sheep. The silages constituted c. 65% of the total dry matter and differed widely in chemical composition, reflecting differences in the extent of fermentation in the silo.

Rumen pH was lower (P < 0·01 and P < 0·001 for Expts 1 and 2 respectively) and the concentration of total volatile fatty acids (VFA) in the rumen was higher (P < 0·001 for Expt 2) for the starchy concentrate. Silages differed in their effects on ruminal proportions of acetate (P < 0·001 and P < 0·01 for Expts 1 and 2 respectively) and, inversely, of propionate (P < 0·001 for Expt 1). There was evidence of a strong relationship between the molar proportion of propionate in the rumen and the concentration of lactic acid in the silage. The results indicate that the production of propionate during the metabolism of silage lactic acid by the rumen microbial population was the predominant influence on rumen fermentation pattern.

It is suggested that this relationship is the basis of some of the differences in milk production reported for silages showing restricted as opposed to extensive fermentation.

Type
Animals
Information
The Journal of Agricultural Science , Volume 122 , Issue 1 , February 1994 , pp. 145 - 150
Copyright
Copyright © Cambridge University Press 1994

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References

Castle, M. E., Gill, M. S. & Watson, J. N. (1981). Silage and milk production: a comparison between barley and dried sugar-beet pulp as silage supplements. Grass and Forage Science 36, 319–324.Google Scholar
Chamberlain, D. G., Thomas, P. C. & Anderson, F. J. (1983). Volatile fatty acid proportions and lactic acid metabolism in the rumen in sheep and cattle receiving silage diets. Journal of Agricultural Science, Cambridge 101, 47–58.Google Scholar
Chamberlain, D. G., Thomas, P. C. & Robertson, S. (1987). The effect of formic acid, bacterial inoculant and enzyme additions on feed intake and milk production in cows given silages of high or moderate digestibility. In Proceedings of the 8th Silage Conference, pp. 31–32. Hurley: Institute of Grassland and Animal Production.Google Scholar
Chamberlain, D. G., Martin, P. A. & Robertson, S. (1990). The effect of the extent of fermentation in the silo on the nutritional value of grass silage for milk production. In Proceedings of the 9th Silage Conference, pp. 122–123. University of Newcastle upon Tyne.Google Scholar
Cottyn, B. G. & Boucque, C. V. (1968). Rapid method for the gas-chromatographic determination of volatile fatty acids in rumen fluid. Journal of Agricultural and Food Chemistry 16, 105–107.Google Scholar
Elsden, S. R. & Gibson, Q. H. (1954). The estimation of lactic acid using eerie sulphate. Biochemical Journal 58, 154–158.Google Scholar
Genstat 5 Committee (1990). Genstat 5 Release 2 Reference Manual Supplement. Rothamsted: Lawes Agricultural Trust.Google Scholar
Gordon, F. J. (1989 a). An evaluation through lactating cattle of a bacterial inoculant as an additive for grass silage. Grass and Forage Science 44, 169–179.CrossRefGoogle Scholar
Gordon, F. J. (1989 b). A further study on the evaluation through lactating cattle of a bacterial inoculant as an additive for grass silage. Grass and Forage Science 44, 353–357.CrossRefGoogle Scholar
Kassem, M. M., Thomas, P. C., Chamberlain, D. G. & Robertson, S. (1987). Silage intake and milk production in cows given barley supplements of reduced ruminal degradability. Grass and Forage Science 42, 175–183.Google Scholar
Mayne, C. S. (1990). An evaluation of an inoculant of Lactobacillus plantarum as an additive for grass silage for dairy cattle. Animal Production 51, 1–13.Google Scholar
Mayne, C. S. & Gordon, F. J. (1984). The effect of type of concentrate and level of concentrate feeding on milk production. Animal Production 39, 65–76.Google Scholar
Mould, F. L., Ørskov, E. R. & Mann, S. O. (1983). Associative effects of mixed feeds. I. Effects of type and level of supplementation and the influence of the rumen fluid pH on cellulolysis in vivo and dry matter digestion of various roughages. Animal Feed Science and Technology 10, 15–30.CrossRefGoogle Scholar
Newbold, C. J. (1985). Microbial metabolism of lactic acid in the rumen. Phd thesis, University of Glasgow.Google Scholar
Patterson, H. D. & Thompson, R. (1971). Recovery of inter-block information when block sizes are unequal. Biometrika 58, 545–554.CrossRefGoogle Scholar
Robinson, D. L. (1987). Estimation and use of variance components. The Statistician 36, 3–14.Google Scholar
Sharp, R., Hooper, P. G. & Armstrong, D. G. (1990). An investigation into the efficacy of an inoculant of lactic acid bacteria as a silage additive. In Proceedings of the 9th Silage Conference, pp. 48–49. University of Newcastle upon Tyne.Google Scholar
Sloan, B. K., Rowlinson, P. & Armstrong, D. G. (1987). A note on concentrate energy source for dairy cows in mid lactation. Animal Production 45, 321–323.Google Scholar