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LS-means of shell parameters of four different hen genotypes (A–D) as differentiated by hen age (week). (A) shell strength (N) at compression, (B) shell-to-egg-compression (%), (C) shell stiffness (N/m), (D) shell thickness (µm) at equator, (E) shell weight (g) after air drying, and (F) shell percentage (w/w), n = 30 for genotype A and 45 for genotypes B, C and D.
