Melatonin in the plasma of growing sheep subjected to short and skeleton long photoperiods

The levels of melatonin in plasma were measured at hourly intervals for 24 h in 8 sheep, 4 under 8L:16D (short day) and 4 under 7L:10D:1L:6D (skeleton long day) after 38 days of exposure. Mean concentrations did not differ significantly between treatments (52 pg/ml under short days; 91 pg/ml for ske...

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Bibliographic Details
Published inExperientia Vol. 40; no. 7; pp. 758 - 760
Main Authors Brinklow, B.R, Forbes, J.M, Rodway, R.G
Format Journal Article
LanguageEnglish
Published Switzerland 15.07.1984
Subjects
animal behavior
animal ecology
animal physiology
Animals
Circadian Rhythm
Female
Hydrocortisone - blood
Light
Male
Melatonin - blood
Periodicity
Pineal Gland - physiology
Prolactin - blood
Sheep - physiology
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Summary:The levels of melatonin in plasma were measured at hourly intervals for 24 h in 8 sheep, 4 under 8L:16D (short day) and 4 under 7L:10D:1L:6D (skeleton long day) after 38 days of exposure. Mean concentrations did not differ significantly between treatments (52 pg/ml under short days; 91 pg/ml for skeleton long days), but the levels were more stable during 24 h in the SD treatment. Under skeleton long days there were 3 peaks during the 10D scotophase, with low levels during the 6D scotophase and the 7L photophase.
ISSN:0014-4754
DOI:10.1007/BF01949765