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A, B. Effect of chronic heat stress on mRNA copies of HSP70 and HSP90 genes in broilers of two breeds. Ross 308 (RO), 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 twenty broilers (10 birds/strain/temperature).
