Day time and night time magnitude of adrenal response to immobilization adrenocorticotropin in rams
2000
Gudev, D. | Alexandrov, S. | Popova-Ralcheva, S. | Alexandrov, A. (Research Institute of Animal Science, BG-2232 Kostinbrod (Bulgaria))
Six rams were subjected to stress by injection of exogenous adrenocorticotropin or by immunobilization for 60 min. Night time samples were taken at 19 h and 23 h in winter and summer, respectively. Plasma cortisol was used as indicator of adrenal function and plasma testosterone - as indicator of testes function. It was established that photoperiod doesn't influence adrenal response to immobilization or adrenocorticotropin injection both in summer and winter. Furthermore day time and night time melatonin doesn't influence the inhibitory effect of exogenous adrenocorticotropin on testosterone secretion.
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