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Liver IGF-1 mRNA expression, between ED10 and ED20, of broilers incubated in the dark as a negative control (dark) or under monochromatic green light from different days of incubation to day of hatch (GD0–20, GD15–20, GD16–20, and GD18–20). Data are presented as mean ± SEM. Means of the groups on a specific day with different lowercase letters differ significantly (P < 0.05). Abbreviations: ED, embryonic day; IGF-1, insulin-like growth factor 1.
