Frequency of headshaking in White Leghorn chickens in response to hormonal and environmental changes |
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| Affiliation: | 1. Equine Immunology Laboratory, Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA;2. Cornell Mammalian Cell Reprogramming Core, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA;3. Cornell Statistical Consulting Unit, Cornell University, Ithaca, NY 14853, USA;1. Department of Psychiatry and Psychology, Center for Behavioral Health, Neurological Institute, Cleveland Clinic, 1730 W 25th Street, Cleveland, OH 44113, United States;2. Middlebury College, Middlebury, VT, United States |
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| Abstract: | Frequency of headshaking in chickens from two selected lines (HA and LA) known to differ in this trait was observed at various ages, during hormonal fluctuations and in different environmental surroundings. Neither hormonal changes concomitant with the initial onset of lay nor ingestion of corticosterone (which stopped egg production in 240-day-old pullets) altered headshaking frequency. When pullets reared in flocks on litter were moved at 77 days of age to individual battery cages, headshaking frequency was dramatically increased in one flock but did not change in another flock. Moving 252-day-old birds from individual cages to floor pens decreased headshaking frequency in males but not in females; returning the birds to cages did not significantly alter levels of headshaking. In older birds (252 days of age), headshaking frequency in all birds in line HA and in males of line LA were considerably greater than in LA females. |
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