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Temperature and relative humidity (RH) fluctuation in the environmental chambers (A,B), and inside and outside the barn (C,D) during the cyclic heat stress (CHS) experiment. Birds raised under recommended conditions from day 0 to 28. From day 29 to 42, birds either raised at thermoneutral temperature (CTL, 23°C) or exposed to CHS (35°C). Data are presented as mean ± SEM (n = 1/chamber or 8/group).
