The purpose of the study was to specify full leukocytic responses in broilers to chronic intermittent noise exposure at two different levels (70 and 80 dB) and to assess the effect of the timing of the beginning of exposure to intermittent noise (from day 1 or day 7 of fattening). Noise treatment of 80 dB resulted in a significant (P < 0.05) elevation of heterophil to lymphocyte ratio (HLR) indicating a stress response of the broilers to the noise stimulus at the level of 80 dB in the course of fattening, in contrast to the 70 dB noise that did not cause any significant changes in HLR when compared to the control without noise treatment. Noise treatment of both 70 and 80 dB intensities also resulted in a significant elevation of basophil granulocytes. We found a different leukocytic response in broilers exposed to chronic intermittent noise from the first day of fattening in comparison to broilers exposed to this noise stimulus from the seventh day. There was a significantly smaller total number of leukocytes (P < 0.01) and significantly smaller differential counts of heterophils (P < 0.01), lymphocytes (P < 0.01) and basophils (P < 0.05) in broilers treated with noise (both 70 dB and 80 dB) from day 7 (group Day7) than in broilers treated with noise from day 1 (group Day 1). Differential counts of eosinophils and monocytes were not affected by the time of exposure to intermittent noise in this study.
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