Nocturnal variation of prolactin secretion in the Mouflon ( Ovis gmelini musimon) and domestic sheep ( Ovis aries): seasonal changes

Seasonal changes in nocturnal prolactin secretion and their relationship with melatonin secretion were monitored in wild (Mouflon, Ovis gmelini musimon) and domesticated sheep (breed Manchega, Ovis aries). Two groups of eleven adult females each, were maintained outdoors under natural photoperiod. P...

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Bibliographic Details
Published in:Animal reproduction science 2000-12, Vol.64 (3), p.211-219
Main Authors: Santiago-Moreno, J, González-Bulnes, A, Brunet, A.Gómez, Campo, A.del, Picazo, R, Sebastián, A.López
Format: Article
Language:English
Subjects:
Analysis of Variance
Animals
Animals, Wild
Circadian Rhythm - physiology
Female
Melatonin
Melatonin - blood
Melatonin - secretion
Mouflon
Nocturnal
Prolactin
Prolactin - blood
Prolactin - secretion
Radioimmunoassay
Seasons
Sheep
Sheep - physiology
Sheep, Domestic - physiology
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Summary:Seasonal changes in nocturnal prolactin secretion and their relationship with melatonin secretion were monitored in wild (Mouflon, Ovis gmelini musimon) and domesticated sheep (breed Manchega, Ovis aries). Two groups of eleven adult females each, were maintained outdoors under natural photoperiod. Plasma concentrations of prolactin and melatonin were determined during the summer and winter solstices and the autumn and spring equinoxes. Blood samples were collected every 3 h during the night hours, and 1 h before and after the onset of darkness and sunrise. Maximum mean plasma concentrations of prolactin during the dark-phase in Mouflons were observed in the summer solstice, ( P
ISSN:0378-4320
1873-2232
DOI:10.1016/S0378-4320(00)00213-X