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Effect of chronic heat stress on mRNA copies of CASP6 genes in broilers of two breeds. Ross 308 (RO) and Red JA Cou Nu (CN) broiler genetic strains were maintained for 4 weeks (from the 4th to the 8th week of age) at temperatures of 34 °C (HT) and 22 °C (CT). Each histogram represents the average mRNA copies (means ± s.e.m. as error bar) of ten broilers. Different small letters indicate significant differences at P ≤ 0.05.
