F. C. Bryant, M. M. Kothmann, L. B. Merrill, Nutritive Content of Sheep, Goat, and White-Tailed Deer Diets on Excellent Condition Rangeland in Texas, Journal of Range Management, Vol. 33, No. 6 (Nov., 1980), pp. 410-414
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Bryant et al. (1980) studied this question.