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Carbohydrate metabolism in the ruminant

Bacterial carbohydrates formed in the rumen and their contribution to digesta entering the duodenum

Published online by Cambridge University Press:  07 January 2011

A. B. McAllan  and
R. H. Smith
A. B. McAllan
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
R. H. Smith
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
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Abstract

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1. Samples of mixed bacteria were separated from rumen digesta taken from calves, kept out of contact with adult animals, and from sheep and cows.

2. For calves receiving a diet made up of equal amounts of roughage and cereals with 13–16 g nitrogen/kg dry matter, samples of mixed bacteria taken 4–6 h after feeding contained, on average, 140 g glucose in α-linked polymers (α-dextran), 25 g galactose and a total of 25 g other non-glucose, non-galactose sugars (mainly rhamnose, ribose and mannose) in combined forms per kg dry matter.

3. The α-dextran content of similar bacteria samples from sheep or cows receiving diets of similar composition was 70 g/kg dry matter. Samples from animals receiving all-roughage diets contained only 25 g α-dextran/kg dry matter, but those from cows given more than 70% of their ration as concentrates (mainly cereal) contained 150 g α-dextran/kg dry matter.

4. Addition of supplementary protein or urea to cereal–roughage diets given to calves greatly depressed the amount of α-dextran in the rumen bacterial samples to an average value of 60 g/kg dry matter.

5. Samples taken before a morning feed (i.e. after 16 h fasting) contained less α-dextran than samples taken 4–6 h after feeding for both calves and cows.

6. Under different conditions, variations in the amounts of galactose in rumen bacteria sometimes paralleled variations in α-dextran. Amounts of other non-glucose sugars did not vary greatly.

7. It was estimated, from a comparison of the compositions of rumen bacteria and duodenal contents, that, in the latter, the rhamnose, ribose and mannose came mainly from the bacteria, the arabinose, xylose and cellulose-glucose mainly from the diet and the galactose and α-dextran-glucose from both sources.

Type
Research Article
Information
British Journal of Nutrition , Volume 31 , Issue 1 , January 1974 , pp. 77 - 88
Copyright
Copyright © The Nutrition Society 1974

References

REFERENCES

Balch, C. C. & Cowie, A. T. (1962). Cornell Vet. 52, 206.Google Scholar
Doetscli, R. N., Howard, B. H., Mann, S. O. & Oxford, A. E. (1957). J. gen. Microbial. 16, 156.CrossRefGoogle Scholar
Doetsch, R. N., Robinson, R. G., Brown, R. E. & Shaw, J. C. (1953). J. Dairy Sci. 36, 825.CrossRefGoogle Scholar
Gibbons, R. J., Doetsch, R. N. & Shaw, J. C. (1955). J. Dairy Sci. 38, 1147.CrossRefGoogle Scholar
Heald, P. J. (1951). Br. J. Nutr. 5, 84.CrossRefGoogle Scholar
Hobson, P. N. & Mann, S. O. (1955). J. gen. Microbiol. 13, 420.CrossRefGoogle Scholar
Howard, B. H. (1955). Biochem. J. 60, i.Google Scholar
Hungate, R. E. (1963). J. Bact. 86, 848.CrossRefGoogle Scholar
Jouany, J-P. & Thivend, P. (1972 a). Annls Biol. anim. Biochim. Biophys. 12, 673.CrossRefGoogle Scholar
Jouany, J-P. & Thivend, P. (1972 b). Annls Biol. anim. Biochim. Biophys. 12, 679.CrossRefGoogle Scholar
Latham, M. J., Sharpe, M. E. & Sutton, J. D. (1971). J. appl. Bact. 34, 425.CrossRefGoogle Scholar
McAllan, A. B. & Smith, R. H. (1969). Br. J. Nutr. 23, 671.CrossRefGoogle Scholar
McAllan, A. B. & Smith, R. H. (1971). Proc. Nutr. Soc. 31, 24A.Google Scholar
McAllan, A. B. & Smith, R. H. (1973). Br. J. Nutr. 29, 331CrossRefGoogle Scholar
MacRae, J. C. & Armstrong, D. G. (1968). J. Sci. Fd Agric. 19, 578.CrossRefGoogle Scholar
Masson, F. M. & Oxford, A. E. (1951). J. gen. Microbiol. 5, 664.CrossRefGoogle Scholar
Oxford, A. E. (1951). J. gen. Microbtol. 5, 83.CrossRefGoogle Scholar
Porter, P. & Singleton, A. G. (1971). Br. J. Nutr. 26, 75.CrossRefGoogle Scholar
Singh, Y. K. & Trei, J. E. (1970). J. Anim. Sci. 31, 253.Google Scholar
Smith, R. H. (1969). J. Dairy Res. 36, 313.CrossRefGoogle Scholar
Smith, R. H. & McAllan, A. B. (1966). Br. J. Nutr. 20, 703.CrossRefGoogle Scholar
Smith, R. H. & McAllan, A. B. (1969). Automation in Analytical Chemistry (Technicon international Symposium, 1969) p. 207. Basingstoke, Hants: Technicon Instruments Company Ltd.Google Scholar
Smith, R. H. & McAllan, A. B. (1970). J. Nutr. 24, 545.CrossRefGoogle Scholar
Smith, R. H. & McAllan, A. B. (1971). Br. J. Nutr. 25, 181.CrossRefGoogle Scholar
Smith, K. H. & McAllan, A. B. (1974). Br. J. Nutr. 31, 27.CrossRefGoogle Scholar
Thomas, G. J. (1960). J. agric. Sci.Camb. 54, 360.CrossRefGoogle Scholar
Thompson, J. K. & Hobson, P. N. (1971). J. agric. Sci., Camb. 76, 423.CrossRefGoogle Scholar
Walker, D. J. (1968). Appl. Microbial. 16, 1672.CrossRefGoogle ScholarPubMed
Walker, D. J. & Nader, C. J. (1970). Aust. J. agric. Res. 21, 747.CrossRefGoogle Scholar
Williams, A. P., McAllan, A. B. & Smith, R. H. (1973). Proc. Nutr. Soc. 32, 85p.Google Scholar