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Quantitative analyses of crude protein, crude fat, crude fiber, ash, calcium, phosphorus, and carotene were performed on 9 forage species, collected on 5 dates during a year. Crude protein levels were low in most forage species by mid-winter. Phosphorus levels were low in most plants throughout the year. Lichens, an important winter forage of reindeer, appear to be deficient in crude protein, calcium, phosphorus, and carotene.
George W. Scotter (Sat,) studied this question.