Richard M. Kaminski, J. Brian Davis, H. Werner Essig, Patrick D. Gerard, Kenneth J. Reinecke, True Metabolizable Energy for Wood Ducks from Acorns Compared to Other Waterfowl Foods, The Journal of Wildlife Management, Vol. 67, No. 3 (Jul., 2003), pp. 542-550
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Kaminski et al. (2003) studied this question.
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