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Effect of chronic heat stress on the histopathological changes in broiler liver (H&E stain; scale bar: 50 µm). Abbreviations: 7d NOR, 7 d of heat exposure, normal control group; 14d NOR, 14 d of heat exposure, normal control group; 7d HS, 7 d of heat exposure, heat stress group; 14d HS, 14 d of heat exposure, heat stress group; 7d PF, 7 d of heat exposure, pair-feeding group; 14d PF, 14 d of heat exposure, pair-feeding group.
