Seasonal changes in plasma LH levels in domestic ducks.

Journal of Reproduction and Fertility
E HaaseE Paulke

Abstract

Seasonal changes in plasma LH concentrations were measured by radioimmunoassay every month for 1 year in nine Khaki Campbell drakes kept under natural lighting conditions in Kiel, Germany. The LH levels rose in all the birds in March and April and reached a mean (+/-S.E.) maximum of 2-4 +/- 0-2 ng/ml early in May. Thereafter, LH levels remained high in three drakes, but decreased in the other six to between 0-9 and 0-4 ng/ml early in June and/or July and rose to about 2-5 ng/ml by the beginning of August. Plasma LH levels started to fall in all nine drakes in September and by early October had reached winter values of about 1-2 to 1-5 ng/ml. A small transient increase in the level of circulating LH was observed in most drakes during November or December.

Citations

Jul 1, 1983·Journal of Steroid Biochemistry·E Haase
Apr 1, 1995·Domestic Animal Endocrinology·J M Jacquet, B Sauveur
Sep 3, 2014·Neuroscience and Biobehavioral Reviews·Patricia L R Brennan, Elizabeth Adkins-Regan
Sep 1, 1977·General and Comparative Endocrinology·C R Storey, T J Nicholls
Jan 1, 1982·General and Comparative Endocrinology·E HaaseE Paulke

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