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Monensin induced metabolic changes in cattle fed a restricted intake of lucerne hay

Published online by Cambridge University Press:  27 March 2009

J. C. O'Kelly  and
W. G. Spiers
J. C. O'Kelly
Affiliation:
CSIRO, Division of Tropical Animal Science, Tropical Cattle Research Centre, Box 5545, Rockhampton Mail Centre, Queensland, 4702, Australia
W. G. Spiers
Affiliation:
CSIRO, Division of Tropical Animal Science, Tropical Cattle Research Centre, Box 5545, Rockhampton Mail Centre, Queensland, 4702, Australia
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Extract

O'Kelly (1985) has presented evidence which suggests that at the same feed intake Brahman cross cattle synthesize more microbial lipid than British cattle with a resultant increased efficiency of utilization of metabolizable energy for maintenance. The lipid content of bacteria associated with both liquid and solid fractions of rumen contents is also higher in Brahman than in Hereford cattle (J. C. O'Kelly & W. G. Spiers, unpublished). The reasons for these breed differences are unknown. A step in investigating the problem could be to determine whether microbial lipid content in Hereford cattle can be increased by altering rumen fermentation patterns in association with changes in the microbial population. Ionophores alter rumen fermentation by increasing the production of propionic acid relative to other volatile fatty acids and also inhibit Gram-positive bacteria by facilitating the formation and transport across cell membranes of lipid-soluble complexes with various cations (Bergen & Bates, 1984). However, there are no reports on the effects of ionophores on microbial lipid metabolism in cattle on restricted feed intakes typical of those in tropical areas.

Type
Short Notes
Information
The Journal of Agricultural Science , Volume 111 , Issue 2 , October 1988 , pp. 403 - 406
Copyright
Copyright © Cambridge University Press 1988

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References

Bergen, W. G. & Bates, D. B. (1984). Ionophores: Their effect on production efficiency and mode of action. Journal of Animal Science 58, 1465–1483.CrossRefGoogle ScholarPubMed
Borchers, R. (1977). Allantoin determination. Analytical Biochemistry 79, 612–613.CrossRefGoogle ScholarPubMed
Broome, A. W. J. (1980). Mechanism of action of growthpromoting agents in ruminant animals. In Growth in Animals (ed. Lawrence, T. L. J.), pp. 189–205. London: Butterworths.CrossRefGoogle Scholar
Chamberlain, D. G. & Thomas, P. C. (1983). The effect of supplemental methionine and inorganic sulphate on the ruminal digestion of grass silage in sheep. Journal of the Science of Food and Agriculture 34, 440–446.CrossRefGoogle ScholarPubMed
Dennis, S. M., Nagaraja, T. G. & Bartley, E. E. (1981). Effects of lasalocid or monensin on lactate-producing or -using rumen bacteria. Journal of Animal Science 52, 418–426.CrossRefGoogle ScholarPubMed
Logsdon, E. E. (1960). A method for the determination of ammonia in biological materials on the autoanalyzer. Annals of the New York Academy of Sciences 87, 801–807.CrossRefGoogle ScholarPubMed
Merry, R. J. & McAllan, A. B. (1983). A comparison of the chemical composition of mixed bacteria harvested from the liquid and solid fractions of rumen digesta. British Journal of Nutrition 50, 701–709.CrossRefGoogle ScholarPubMed
O'Kelly, J. C. (1985). Possible contribution of rumen lipid synthesis to genetic differences in maintenance requirement. Nutrition Reports International 31, 135–139.Google Scholar
O'Kelly, J. C. (1987). Influence of dietary fat on some metabolic responses of cattle to hyperthermia induced by heat exposure. Comparative Biochemistry and Physiology 87A, 677–682.CrossRefGoogle Scholar
Smith, R. H. & McAllan, A. B. (1974). Some factors influencing the chemical composition of mixed rumen bacteria. British Journal of Nutrition 31, 27–34.CrossRefGoogle ScholarPubMed
Thornton, J. H. & Owens, F. N. (1981). Monensin supplementation and in vivo methane production by steers. Journal of Animal Science 52, 628–634.CrossRefGoogle ScholarPubMed