Abstract
THE results reported in this communication were obtained as part of a study related to a condition of silica urolithiasis which had been observed in steers on the Western Ranges of Canada and the United States. Experiments in this laboratory have shown that sheep fed a hay from Western Canada containing 8.28 per cent silica (expressed on air-dry basis) excreted urine with a pH of approximately 5.5. Sheep in the control group that were fed a hay from Eastern Canada containing 0.78 per cent silica excreted urine with a pH of approximately 8.2. Consumption of water and excretion of urine by sheep fed the high-silica hay were about one-half that of the sheep in the control group.
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