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    
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.
L A Zarazaga; B Malpaux; P Chemineau
Related Documents :
18776769 - Late recurrence of ewing sarcoma during pregnancy: a report of 2 cases.
3184059 - The number of spermatozoa, the number of ovulations per ewe, and immunization against a...
16032019 - Steroidal hormones determine sex-related differences in opioid-induced elevation of noc...
12606329 - Maternal undernutrition from early- to mid-gestation leads to growth retardation, cardi...
11730799 - High levels of congenital transmission of toxoplasma gondii in a commercial sheep flock.
7424999 - Maternofetal electrical potential difference in conscious sheep: effect of fetal death ...
17211969 - Screening of foetal distress by assessment of umbilical cord lactate.
21349859 - Identifying by means of coping typologies and primary appraisal the likelihood of posit...
24065029 - Radical trachelectomy: the first step of fertility preservation in young women with cer...
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    
Neuroendocrinologie sexuelle, physiologie de la reproduction, Nouzilly, France.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Circadian Rhythm
Estrus / physiology
Melatonin / blood,  secretion*
Pregnancy, Animal / physiology*
Progesterone / blood
Sheep / physiology*
Time Factors
Reg. No./Substance:
57-83-0/Progesterone; 73-31-4/Melatonin

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

Previous Document:  Altered glucocorticoid receptor expression and function during mouse skin carcinogenesis.
Next Document:  Effects of ruminal or postruminal fish oil supplementation on intake and digestion in dairy cows.