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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and solid fractions of rumen contents is also higher in Brahman than in Hereford cattle (J. C. O'Kelly & W. G. Spiers, unpublished).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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