Genetic basis of negative heterosis for growth traits in chickens revealed by genome-wide gene expression pattern analysis.

2 and Table S 6 , most carcass traits, including slaughter weight, breast muscle weight, drumstick weight, and drumstick muscle weight, showed extremely significant negative heterosis ( P < 0.01) in reciprocal crosses of females and males.

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H% was considered significant and highly significant if P -value < 0.05, and P -value < 0.01, respectively.

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