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A, B. Effect of chronic heat stress on mRNA copies of CAT and SOD 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). Ten birds/strain/temperature were analysed and each histogram represents the average mRNA copies (means ± s.e.m. as error bar). Different small letters indicate significant differences at P ≤ 0.05.
