Article (Scientific journals)
Seasonal changes in some plasma hormones in pigeons: diurnal variation under natural photoperiods with constant or seasonally changing ambient temperature.
Rintamaki, H.; Hissa, R.; Etches, R. J. et al.
1986In Comparative Biochemistry and Physiology, 84 (1), p. 33-8
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Keywords :
Acclimatization; Animals; Circadian Rhythm; Columbidae/blood; Corticosterone/blood; Fatty Acids, Nonesterified/blood; Female; Growth Hormone/blood; Hormones/blood; Light; Luteinizing Hormone/blood; Male; Seasons; Thyroxine/blood; Triiodothyronine/blood
Abstract :
[en] The diurnal variations of several plasma hormones and free fatty acids (FFA) were studied during periods in summer and winter for pigeons reared either outdoors or indoors. The latter were subjected to constant temperature and naturally varying photoperiods. A significant seasonal variation in the mean daily levels of triiodothyronine (T3), thyroxine (T4), corticosterone (B), lutropin (LH) and FFA was seen in the outdoor birds and in the T4 and B levels of indoor birds. The diurnal variation of hormone levels was generally more pronounced in winter in both groups. Cold ambient temperature significantly decreased the plasma LH level and potentiated the increasing effect of short photoperiod on plasma B level. Diurnal variation of plasma FFA level seems to be under the control of photoperiod, without any effects due to the ambient temperature. No significant correlation was found between FFA and GH concentrations.
Disciplines :
Zoology
Environmental sciences & ecology
Author, co-author :
Rintamaki, H.
Hissa, R.
Etches, R. J.
Scanes, C. G.
Balthazart, Jacques  
Saarela, S.
Language :
English
Title :
Seasonal changes in some plasma hormones in pigeons: diurnal variation under natural photoperiods with constant or seasonally changing ambient temperature.
Publication date :
1986
Journal title :
Comparative Biochemistry and Physiology
ISSN :
0010-406X
Publisher :
Pergamon Press, Oxford, United Kingdom
Volume :
84
Issue :
1
Pages :
33-8
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 July 2011

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