The effects of acute noise on fear and some stress parameters in broilers [Akut gürültünün etlik piliçlerde korku ve bazi{dotless} stres göstergeleri üzerine etkileri]

The aim of this study was to investigate the efects of acute noise on some stress parameters and fear reactions in broilers. day old 192 broiler chicks (ross 308) were randomly allocated to 4 diferent treatment groups containing 24 birds (12 male,12 female) for two replication. after 42 days regular rearing period,birds were exposed to 55 (control),80,100 and 120 db acute noise for 15 min. with a device hanged to their rooms. results showed that corticosterone levels at 100 db and 120 db noise levels increased significantly (p<0.001). it was revealed that acute noise had increased blood cholesterole levels in all treatment groups,but increased glucose levels only in 120 db noise group. conversely total protein level decreased according to increase in noise level. tonic immobility test (ti) in which there were no significant diferences between ti durations for all treatment groups,revealed that acute noise has negative efect on fear in broilers. on this context,ti trials were recorded as high in control group (1.8) than 100 and 120 db groups (1.4 ve 1.3). it was concluded that acute noise over 100 db have negative efects on some stress parameters and fear in broilers,for that reason broilers should housed at lower noise levels.