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The relation between the silica content of the diet and the excretion of silica by sheep

Published online by Cambridge University Press:  27 March 2009

L. H. P. Jones  and
K. A. Handreck
L. H. P. Jones
Affiliation:
Division of Plant Industry, C.S.I.R.O., c/o School of Agriculture, University of Melbourne, Victoria
K. A. Handreck
Affiliation:
Division of Plant Industry, C.S.I.R.O., c/o School of Agriculture, University of Melbourne, Victoria
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Extract

Three diets, with silica contents ranging from 0·10–2·84% SiO2 in the dry matter, were fed to sheep and the distribution of silica between the faeces and urine was measured, together with the concentrations of silica in the rumen liquor and the blood. The sum of the amounts of silica excreted in the urine and faeces was within 1% of the amounts ingested. The amounts excreted in the urine increased with increasing silica content of the diet but reached no more than 205 mg. SiO2/day, apparently being limited by the solubility of silica in the rumen. Since the concentration of silica in the blood remained practically constant it is concluded that the silica which enters the blood stream from the alimentary tract passes rapidly into the urine. The amounts of silica excreted in the urine represented small proportions only of the amounts ingested and since the recoveries of silica in the faeces were so nearly complete it is suggested that silica be re-examined as an indicator for digestibility studies.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 65 , Issue 1 , August 1965 , pp. 129 - 134
Copyright
Copyright © Cambridge University Press 1965

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