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Mechanisms of aggression and production in chickens: genetic variations in the functions of serotonin, catecholamine, and corticosterone

Published online by Cambridge University Press:  25 June 2007

H.W. CHENG  and
W.M. MUIR
H.W. CHENG*
Affiliation:
Livestock Behaviour Research Unit, USDA-ARS, W. Lafayette, IN 47907
W.M. MUIR
Affiliation:
Animal Sciences Department, Purdue University, W. Lafayette, IN 47907, USA
*
*Corresponding author: [email protected]
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Abstract

The neuroendocrine systems, such as dopamine (DA) and serotonin (5-HT) as well as corticosterone (CORT), are involved in regulating behavioural patterns and reproduction in humans and other mammals. Similar functions of neuroendocrine system may present in laying hens. To test the hypothesis, two divergent chicken lines were used in the study. Each line has distinct levels of aggressiveness and productivity at a group setting and exhibits differen susceptibility to various environmental stressors. We found that, at 21 wks of age, LGPS (Low Group Productivity and Survivability) birds had significantly higher blood concentrations of DA and epinephrine than the KGB birds (Kind Gentle Birds, also previously termed HGPS, birds with a High Group Productivity and Survivability) (P<0.01, respectively). The blood concentration of norepinephrine was not significantly different between the lines but the ratio of epinephrine to norepinephrine was higher in LGPS birds (P<0.01). The blood concentration of 5-HT was also significantly higher in LGPS birds compared to KGB birds (P<0.01). In contrast, KGB birds tended to have a higher level of blood CORT (P=0.1). The results suggest that genetic selection for productivity and survivability with domestic behaviours alters the birds' neuroendocrine homeostasis. The selection-associated plasticity of the neuroendocrine system in controlling animal aggression and productivity were discussed in the article.

Keywords

geneproductionaggressionneuroendocrinologychickens
Type
Review Article
Information
World's Poultry Science Journal , Volume 63 , Issue 2 , June 2007 , pp. 233 - 254
Copyright
Copyright © World's Poultry Science Association 2007

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