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Body weight (BW) (A) and pectoralis muscle as percentage of BW (B) of thermally manipulated (TM) [3 h daily (3H), 6 h daily (6H)] and control chickens on days 25 and 35 of age. Results are means ± SE; n = 30. a,bData with different letters differ significantly within the same age group (P < 0.05).
