TY - JOUR
T1 - ICV CRF and isolation stress differentially enhance plasma corticosterone concentrations in layer- and meat-type neonatal chicks
AU - Saito, Shin
AU - Tachibana, Tetsuya
AU - Choi, Yang Ho
AU - Denbow, D. Michael
AU - Furuse, Mitsuhiro
PY - 2005/7
Y1 - 2005/7
N2 - The present study compared the plasma corticosterone concentrations between meat- and layer-type neonatal chicks (Gallus gallus) (1) exposed to isolation-induced stress or (2) injected intracerebroventricularly (ICV) with corticotropin-releasing factor (CRF). Both types of neonatal chicks housed in groups were individually introduced to an open field arena and locomotion and distress-induced vocalizations were monitored for 10 min. The responses of the two strains were remarkably different, with meat-type chicks being less active than layer-type chicks. Distress-induced vocalizations were drastically decreased over time in meat-type chicks while they remained high in layer-type chicks throughout the test. Plasma corticosterone concentrations measured at the end of the test were significantly higher in layer-type chicks than in meat-type ones. Plasma corticosterone concentrations measured 10 min after the ICV injection of CRF were significantly higher in layer- than meat-type chicks. These results indicate that meat-type chicks have either a greater capability to acclimatize to novel environments, or a blunted HPA axis compared with layer-type chicks.
AB - The present study compared the plasma corticosterone concentrations between meat- and layer-type neonatal chicks (Gallus gallus) (1) exposed to isolation-induced stress or (2) injected intracerebroventricularly (ICV) with corticotropin-releasing factor (CRF). Both types of neonatal chicks housed in groups were individually introduced to an open field arena and locomotion and distress-induced vocalizations were monitored for 10 min. The responses of the two strains were remarkably different, with meat-type chicks being less active than layer-type chicks. Distress-induced vocalizations were drastically decreased over time in meat-type chicks while they remained high in layer-type chicks throughout the test. Plasma corticosterone concentrations measured at the end of the test were significantly higher in layer-type chicks than in meat-type ones. Plasma corticosterone concentrations measured 10 min after the ICV injection of CRF were significantly higher in layer- than meat-type chicks. These results indicate that meat-type chicks have either a greater capability to acclimatize to novel environments, or a blunted HPA axis compared with layer-type chicks.
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U2 - 10.1016/j.cbpb.2005.05.054
DO - 10.1016/j.cbpb.2005.05.054
M3 - Article
C2 - 15979366
AN - SCOPUS:23044477384
VL - 141
SP - 305
EP - 309
JO - Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
JF - Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
SN - 1095-6433
IS - 3
ER -