A.J. Parsons, J.A. Newman, P.D. Penning, A. Harvey, R.J. Orr, Diet Preference of Sheep: Effects of Recent Diet, Physiological State and Species Abundance, Journal of Animal Ecology, Vol. 63, No. 2 (Apr., 1994), pp. 465-478
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Parsons et al. (1994) studied this question.
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