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Estradiol (E2) concentration in Lohmann, Shaver, and Smoky Joe hens from 12 to 26 woa ± SEM. p-values for the sources of variation: Age, p < 0.0001; Strain, p < 0.0001; Age*Strain, p < 0.0001. A,Brepresent the significance level between strains at each age. Strains at each timepoint lacking a common subscript demonstrate a significance of p < 0.05.
