Abstract
Calves grazing with their dams on native grassland in southern Alberta had more calculi in their kidneys and bladders at weaning than a similar group of calves grazing an adjacent pasture reseeded to Russian wild ryegrass (Elymus junceus Fisch.). Calculous material in both groups contained high levels of silica (mean 780 g kg−1). Russian wild ryegrass is useful for autumn grazing because it maintains its nutritive value better than indigenous grasses late in the grazing season. The present results indicate that it may also be useful for reducing the formation of siliceous urinary calculi. Key words: Calves, Russian wild ryegrass, silica, urinary calculi
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