Patterns of circulating fsh and lh in ouled djellel ewe lambs during postnatal development
Author
Source
Sciences et Technologie : Sciences de la Nature et de la Vie
Issue
Vol. 2011, Issue 33 (30 Jun. 2011), pp.9-15, 7 p.
Publisher
Publication Date
2011-06-30
Country of Publication
Algeria
No. of Pages
7
Main Subjects
Topics
Abstract EN
Plasma was collected for hormone measurement from 150 Ouled Djellel ewe lambs, born in September, at 0 (< 24 hours), 1, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26 weeks, and at 1 year of age.
Four of the ewe lambs were slaughtered at each of the time points.
The ovaries of the slaughtered lambs were weighed; antral follicles≥3mm in diameter were counted and their size was measured on histological ovarian sections.
Concentrations of follicle stimulating hormone (FSH) and luteinizing hormone (LH) in plasma increased from birth to 10 weeks of age, and then declined to levels similar to those of yearling, sexually mature ewes.
The level of LH then rose again to reach a second peak at 24 weeks of age, which represented the preovulatory LH surge.
The variation in the concentrations of the hormones was accompanied by an initial increase in ovarian weight and maximum follicle diameter at 10 weeks of age, and a second increase in these ovarian characteristics at 18 weeks of age.
These data suggest that Ouled Djellel ewes reach puberty early, at 24 weeks of age, and that there is a relationship between the variations in plasma concentrations of FSH and LH and the changes in follicular populations of antral follicles at certain ages.
Abstract FRE
Le plasma a été collecté de 150 agnelles d'Ouled Djellel nées en septembre à l'âge de 0 (< 24 heures), 1, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26 semaines, et à 1 an.
Quatre agnelles ont été abattues à chacun des âges précédents, les ovaires pesés et les follicules vésiculaires.
Trois mm ont été comptés et leurs diamètre mesurées sur les sections histologiques de l’ovaire.
La concentration des deux hormones FSH et LH a augmenté de la naissance à l’âge de 10 semaines, puis elle a diminué pour atteindre des valeurs semblables à celle mesuré chez les agnelles (sexuellement mûres) âgé d’un an.
Mais, l’hormone LH a augmenté une autre fois à l’âge de 24 semaines pour marquer le pic préovulatoire.
Les variations de la concentration de ces hormones sont accompagnées d’une première augmentation du poids des ovaires et du diamètre maximal des follicules à l'âge de10 semaines, et d’une deuxième augmentation des caractères ovariens à l’âge de 18 semaines.
Les résultats indiquent que la brebis d'Oulled Djellel a atteint précocement la puberté à l’age de 24 semaines et qu’une relation existe entre les variations plasmiques de la concentration FSH et LH et les changements dans la population des follicules vésiculaires en fonction de l’âge
American Psychological Association (APA)
Mahdi, D.. 2011. Patterns of circulating fsh and lh in ouled djellel ewe lambs during postnatal development. Sciences et Technologie : Sciences de la Nature et de la Vie،Vol. 2011, no. 33, pp.9-15.
https://search.emarefa.net/detail/BIM-616042
Modern Language Association (MLA)
Mahdi, D.. Patterns of circulating fsh and lh in ouled djellel ewe lambs during postnatal development. Sciences et Technologie : Sciences de la Nature et de la Vie No. 33 (Jun. 2011), pp.9-15.
https://search.emarefa.net/detail/BIM-616042
American Medical Association (AMA)
Mahdi, D.. Patterns of circulating fsh and lh in ouled djellel ewe lambs during postnatal development. Sciences et Technologie : Sciences de la Nature et de la Vie. 2011. Vol. 2011, no. 33, pp.9-15.
https://search.emarefa.net/detail/BIM-616042
Data Type
Journal Articles
Language
French
Notes
Includes bibliographical references : p. 13-15
Record ID
BIM-616042
