L. E. Warren, D. N. Ueckert, J. M. Shelton, Comparative Diets of Rambouillet, Barbado, and Karakul Sheep and Spanish and Angora Goats, Journal of Range Management, Vol. 37, No. 2 (Mar., 1984), pp. 172-180
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Warren et al. (1984) studied this question.
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