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KMID : 1025520050470040697
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Journal of Animal Science and Technology
2005 Volume.47 No. 4 p.697 ~ p.702
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Acoustic Analysis for Thermal Environment-related Vocalizations in Laying Hens
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Jeon J.-H.
Yeon Seong-Chan
Ha Jeung-Key
Lee S.-J.
Chang Hong-Hee
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Abstract
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The aim of this study was to divide vocalizations of laying hens (Hy-Line Brown) into general vocalizations (GVs), heat stress-related vocalization (HSV), and cold stress-related vocalizations (CSVs) and to determine if they are classified by the discriminant function analysis method. Thirty laying hens, 65-wk-old, were recorded using digital video recorders 2 times from 10:00 to 14:00 h in each thermal environment (thermoneutral: 22.0±1.8℃, too hot: 32.0±2.0℃, too cold: $8.0{\pm}1.9^{\circ}C)$ after a 7 day acclimation period. When the laying hens were not recorded, they were kept in thermoneutral conditions. The GVs, HSV, and CSVs were divided based on the shapes of spectrums and spectrograms. The GVs, HSV, and CSVs were identified as 5, 1, and 3 types, respectively. Pitch, intensity, duration, formant 1, formant 2, formant 3, and formant 4 among the thermal environment-related vocalizations were significantly different (P<0.001). The discrimination rate determined by discriminant function analysis was 86.2%. These results suggest that HSV and CSVs are present and may be used as an indicator of the thermal environment.
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KEYWORD
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Laying hens, Vocalization, Heat stress, Cold stress
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