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Weekly recorded live weight (g) of the four genotypes in the free-range system. Abbreviations: BP, Bionda Piemontese; RM, Robusta Maculata; BP × S, Bionda Piemontese × Sasso; RM × S, Robusta Maculata × Sasso. a, b, c values differ significantly. p-values are considered significant when p < 0.05.
