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Effect of dietary monensin and tetronasin on rumen fermentation in sheep

Published online by Cambridge University Press:  24 November 2017

C. J. Newbold  and
R. J. Wallace
C. J. Newbold
Affiliation:
Rowett Research Institute. Bucksburn, Aberdeen AB2 9SB
R. J. Wallace
Affiliation:
Rowett Research Institute. Bucksburn, Aberdeen AB2 9SB
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Extract

Tetronasin is an ionophore which improves feed conversion efficiency in ruminants (Bartle et al, 1988). Its nutritional effects are at least partly derived from its influence on nitrogen and energy metabolism in the rumen. The mode of action of tetronasin is therefore similar to monensin and although it is more potent than monensin, it has a similar spectrum of antimicrobial activity (Newbold et al, 1988). The aim of the present study was to compare the effects of the inclusion of tetronasin or monensin in the diet on the rumen fermentation.

Three mature sheep weighing approximately 50 kg and fitted with rumen cannulae were fed 1 kg/d of a mixed diet of hay, barley, molasses, fishmeal and vitamins/minerals (500, 299.5, 100, 91 and 9.5 g/kg dry matter respectively) in two equal meals. A control diet (no addition, C), tetronasin (10 ppm in the diet, T) or monensin (33 ppm, M) were compared in a 3 x 3 Latin square. Periods were 28 days long with samples taken on two consecutive days during the last 5 days. Samples of rumen fluid were withdrawn at 0, 1, 2, 4 and 6 h after the morning feed for the determination of pH, volatile fatty acids (VFA) L-lactic acid and ammonia concentrations.

Type
Rumen Metabolism
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1990 , March 1990 , pp. 31
Copyright
Copyright © The British Society of Animal Production 1990

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References

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