Document Detail


The characteristics of the melatonin secretory rhythm are not modified by the stage of pregnancy in ewes.
MedLine Citation:
PMID:  9115589     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An experiment was designed to study if, in the same animals, characteristics of the plasma melatonin rhythm vary during pregnancy in ewes. Thirteen Ile-de-France ewes were maintained in natural photoperiod and measurements of the characteristics of the rhythm of melatonin secretion were determined during one estrous cycle and then during pregnancy. Duration and mean plasma concentrations of the nocturnal melatonin elevation were measured at four stages of pregnancy. Melatonin concentrations during the elevation were not significantly affected by the stage of the estrous cycle (mean +/- SEM: 227.8 +/- 34.9, 263.2 +/- 24.2 and 232.4 +/- 27.1 pg/mL for follicular phase, early luteal phase and late luteal phase, respectively), or by the stage of pregnancy (292.8 +/- 22.2, 268.7 +/- 21.7, 267.4 +/- 27.9 and 258.3 +/- 23.5 pg/mL for first, second, third and fourth month of pregnancy, respectively). A strong individual effect was detected (P < 0.01) for melatonin concentrations during elevation (range: 119.2 +/- 11.8 to 396.6 +/- 26.0 pg/mL of plasma). A highly significant correlation coefficient was observed within individuals for night melatonin concentrations between the different physiological stages. It was concluded that melatonin secretion is unaffected by the stage of pregnancy.
Authors:
L A Zarazaga; B Malpaux; P Chemineau
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Reproduction, nutrition, development     Volume:  37     ISSN:  0926-5287     ISO Abbreviation:  Reprod. Nutr. Dev.     Publication Date:  1997  
Date Detail:
Created Date:  1997-04-24     Completed Date:  1997-04-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8913069     Medline TA:  Reprod Nutr Dev     Country:  FRANCE    
Other Details:
Languages:  eng     Pagination:  105-12     Citation Subset:  IM    
Affiliation:
Neuroendocrinologie sexuelle, physiologie de la reproduction, Nouzilly, France.
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MeSH Terms
Descriptor/Qualifier:
Animals
Circadian Rhythm
Estrus / physiology
Female
Melatonin / blood,  secretion*
Photoperiod
Pregnancy
Pregnancy, Animal / physiology*
Progesterone / blood
Sheep / physiology*
Time Factors
Chemical
Reg. No./Substance:
57-83-0/Progesterone; 73-31-4/Melatonin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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