Roger A. H. Draycott, Andrew N. Hoodless, Mark N. Ludiman, Peter A. Robertson, Effects of Spring Feeding on Body Condition of Captive-Reared Ring-Necked Pheasants in Great Britain, The Journal of Wildlife Management, Vol. 62, No. 2 (Apr., 1998), pp. 557-563
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Draycott et al. (1998) studied this question.
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