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Chargo, Nicholas J; Robison, Cara I; Baker, Sydney L; Toscano, Michael Jeffrey; Makagon, Maja M; Karcher, Darrin M (2019). Keel bone damage assessment: consistency in enriched colony laying hens. Poultry Science, 98(2), pp. 1017-1022. Oxford University Press 10.3382/ps/pey373
