Abstract
Six species of forage crops were analyzed for selenium content at weekly intervals during the summer of 1966 at Kapuskasing, Ontario. Based on average values for the season, the ranking of the six forage species by order of decreasing selenium content was: reed canarygrass, creeping red fescue, orchard-grass, bromegrass, timothy, and birdsfoot trefoil. Significant seasonal variations were observed in birdsfoot trefoil, timothy and orchardgrass. Selenium content tended to increase with advancing maturity in timothy and to decrease in birdsfoot trefoil. In orchardgrass, the initial increase in selenium content was followed by a decrease. There were no changes during the season in reed canarygrass, creeping red fescue and bromegrass. All plants sampled contained less selenium than required for the protection of beef calves against nutritional muscular dystrophy.
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