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Article (Scientific journals)
Changes in pituitary responsiveness to luteinizing hormone-releasing hormone during an annual cycle in the domestic duck, Anas platyrhynchos L.
Balthazart, Jacques; Willems, Jean; Hendricks, Jean Claude
1980In Journal of Experimental Zoology, 211 (1), p. 113-23
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Keywords :
Animals; Ducks/physiology; Female; Follicle Stimulating Hormone/blood; Gonadotropin-Releasing Hormone/administration & dosage/pharmacology; Injections, Intravenous; Luteinizing Hormone/blood; Male; Pituitary Gland/drug effects; Seasons
Abstract :
[en] On four occasions during an annual cycle, 5--7 male domestic ducks were injected with two different doses (5 and 20 micrograms) of synthetic luteinizing hormone-releasing hormone (LHRH) to study the possible changes in responsiveness of the pituitary. The luteinizing hormone (LH) and the follicle-stimulating hormone (FSH) were measured in the plasma samples collected after these injections. The induced release of LH changes from one period of the year to another, being minimum in March at the height of the reproductive season. The LHRH injection also induces the release of some FSH but only in limited amounts. The changes in pituitary responsiveness to LHRH are negatively correlated to changes in the circulating LH level (it is high when the plasma LH is low and vice versa). This suggests that the hypothalamic synthesis and release of LHRH must also change during the year.
Disciplines :
Zoology
Endocrinology, metabolism & nutrition
Author, co-author :
Balthazart, Jacques  ;  Université de Liège - ULiège > Département de morphologie et pathologie > Pathologie spéciale et autopsies
Willems, Jean;  Unversité de Liege
Hendricks, Jean Claude
Language :
English
Title :
Changes in pituitary responsiveness to luteinizing hormone-releasing hormone during an annual cycle in the domestic duck, Anas platyrhynchos L.
Publication date :
1980
Journal title :
Journal of Experimental Zoology
ISSN :
0022-104X
eISSN :
1097-010X
Publisher :
John Wiley & Sons, Inc, Hoboken, United States - New Jersey
Volume :
211
Issue :
1
Pages :
113-23
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 July 2011

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