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Influence of age and climatological variations on blood glucose and adrenomedullary catecholamines in the pigeon
Published in -
Volume: 24
Issue: 6
Pages: 817 - 829
A year long study of adrenomedullary catecholamines and blood glucose level of the pigeon (Columba livia Gmelin) at room temperature and during heat stress (at 50°C for 1 hr) reveals that none of the hormones of the adrenal medulla is temperature susceptible. Noradrenaline (NA) response pattern was directly related to solar radiation and inversely to relative humidity, while adrenaline (A) was absolutely independent of climatic factors. Blood glucose level at room temperature remained almost identical throughout the year, undergoing hyperglycemic alterations in May, June and September through December during heat stress. Study on the 4 age groups (from juvenile to senile) demonstrated that younger birds have more A, while the older ones secrete more NA. All the 4 age groups responded by hyperglycemia during heat stress. Glycemic alterations in any case can not be related to the catecholamines. This study reveals that catecholamines are not intimately involved in thermal acclimation process.
About the journal
JournalActa Physiologica Polonica