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Some effects of sulphur intake on molybdenum metabolism in sheep

Published online by Cambridge University Press:  08 December 2008

N. D. Grace  and
N. F. Suttle
N. D. Grace
Affiliation:
Moredun Research Institute, EdinburghEHI7 7JH
N. F. Suttle
Affiliation:
Moredun Research Institute, EdinburghEHI7 7JH
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Abstract

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1. To investigate the effects of sulphur intake on molybdenum metabolism in sheep, ewes were given intakes of 0.3 or 3.5 mg Mo and 0.98, 1.33, 1.73 or 3.23 g S/d in a 2 × 4 factorial experiment with two replicates lasting 35 d. 99Mo with 0.1 mg carrier Mo was infused intravenously for the last 14 d and, when 99Mo concentrations in urine and faeces had attained plateaux (days 11–14), stable Mo and 99Mo balance trials were conducted; samples of blood and rumen contents were taken principally for studies of Mo distribution.

2. Increases in S intake caused the following changes in Mo metabolism; absorption decreased, urinary and faecal endogenous excretion decreased and retention increased; Mo concentrations in rumen contents decreased but the predominant association with the solid phase was unaffected; Mo concentrations in plasma decreased, but a higher proportion was associated with the protein fraction; Mo in protein-free plasma became apparently less ultrafiltrable at the glomerulus.

3. The pattern of response to S for each factor was generally curvilinear, the first increment in S intake having by far the greatest effect. The effect of S was generally greatest at the higher Mo intake.

4. It is suggested that the manifold effects of S on Mo metabolism are related to a common interaction in the rumen leading to the formation of Mo-complexes, possibly thiomolybdates, which are poorly absorbed but even more poorly excreted.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 41 , Issue 1 , January 1979 , pp. 125 - 136
Copyright
Copyright © The Nutrition Society 1979

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