Noise intensities of 115 dB were effective in interrupting brooding in hens (Gross, 1990). Acute noise exposures at 80 dB and 100 dB in broilers increased corticosterone level after 10 min of exposure (Chloupek et al., 2009). The chickens were exposed to sound of 95 dB which lasted 120 min every day during different age periods. This chronic stress caused significant changes in histological structure of their adrenal glands (Žikić et al., 2011).