Length of melatonin exposure and onset of ovarian activity in anoestrous ewes

Adult anoestrous ewes (N = 30) were given intravaginal Silastic implants containing melatonin or empty implants (N = 7) during mid-anoestrus (4 July). Implants were removed 16 days later (Group 1), 36 days later (Group 2) or 93 days later (Group 3). Blood samples were taken twice weekly for progeste...

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Bibliographic Details
Published inJournal of reproduction & fertility Vol. 80; no. 1; pp. 343 - 347
Main Authors Nowak, R, Rodway, R.G
Format Journal Article
LanguageEnglish
Published England 01.05.1987
Subjects
Anestrus
Animals
Drug Implants
Estrus
ewes
Female
melatonin
Melatonin - administration & dosage
Melatonin - pharmacology
ovaries
Ovary - drug effects
Ovary - physiology
Sheep - physiology
Time Factors
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Summary:Adult anoestrous ewes (N = 30) were given intravaginal Silastic implants containing melatonin or empty implants (N = 7) during mid-anoestrus (4 July). Implants were removed 16 days later (Group 1), 36 days later (Group 2) or 93 days later (Group 3). Blood samples were taken twice weekly for progesterone assay to monitor onset of ovarian activity. The percentage of ewes in each group showing early onset of ovarian cyclicity was significantly correlated with length of exposure to melatonin.
ISSN:0022-4251
1470-1626
1741-7899
DOI:10.1530/jrf.0.0800343