Seasonal Changes in Plasma Dehydro-Epiandrosterone (DHEA) Levels of Domestic Geese
Changes in plasma DHEA, testosterone (T) and 17-B-oestradiol (E2) levels were examined in domestic geese of both sexes in the fall and winter. The levels of steroid hormones were determined in blood plasma by means of radio-immunoassay (RIA). A so-called second (autumn) cycle was induced in geese via a dark-room preparation and natural keeping conditions. The plasma levels of DHEA showed a minor peak at onset of the autumn breeding and a major one prior to the more intense spring reproduction in both sexes. The seasonal curves of plasma DHEA appeared fairly similar in ganders and layers and without considerable differences between the absolute values. In ganders, plasma DHEA peaks preceded the elevations in T levels in the fall and spring alike. With layers, in turn, the autumn and spring peaks of plasma DHEA appeared after the peaks in E2 levels. With ganders, the concentration of plasma T seemed to predominate between the two androgens throughout the experimental period. With layers, in turn, the concentration of DHEA surpassed the level of plasma E2 at the time of the peak periods and other times during the study, as well. In domestic geese, DHEA is probably involved in the autumn physiological processes and the induction of reproduction during fall and early spring periods, alike.
KeywordsGeese sexual steroid DHEA-seasonal change
- 1.Biczó, A., Tarcsai, G., Kelemen, K., Péczely, P. (2000) Relationship between faecal sexual steroid content and intensity of display behaviour of male great bustard (Otis tarda). 7th International Symposium on Avian Endocrinology, Varanasi, U.P. India. 11.11 Poster.Google Scholar
- 2.Biczó, A., Tarcsai, G., Kelemen, K., Mödlinger, P., Pészely, P. (2002) Endocrinological study of display behaviour of male great bustards (Otis tarda) using faecal steroid analysis. Állattenyésztés és Takarmányozás 51, 87–88. (In Hungarian.)Google Scholar
- 3.Deviche, P. (1997) Seasonal reproductive pattern of white-winged crossbills in interior Alaska. J. Field Ornithol. 68, 613–621.Google Scholar
- 4.Farner, D. S. (1980) The regulation of the annual cycle of the white-crowned sparrow, Zonotrichia leucophrys gambelii. 17th Congr. Internat. Ornithol. Proc. Deutsche Ornithol. Gesell. Berlin, pp. 71–82.Google Scholar
- 7.Garde, A. H., Hansen, A. M., Skovgaard, L. T., Christensen, J. M. (2000) Seasonal and biological variation of blood concentration of total cholesterol, dehydroepiandrosterone sulphate, hemoglobin A (1c), IgA, prolactin, and free testosterone in healthy women. Clin. Chem. 46, 551–559.PubMedGoogle Scholar
- 9.Jallageas, M. (1975) Interactions reciproques testo-thyriodinennes chez le Canard male. Incidences sur les cycles endocriniens annuels. Thése, Université de Montpellier, France.Google Scholar
- 10.Kisné Do Thi Dong, X., Hargitai, Cs., Fancsovits, P., Péczely, P. (1995) Seasonal pattern of reproduction of domestic ganders (Anser anser). Bull. Univ. Agric. Sci. 75th Anniversary Edition, Gödöllő. II. pp. 95–96.Google Scholar
- 11.Landjánszky, V., Kelemen, K., Péczely, P. (2002) Seasonal and diurnal changes of plasma and faecal sexual steroids in mallards. Proc. 23th Intern. Ornithol. Conf. p. 319.Google Scholar
- 19.Pintér, O., Péczely, P. (2002) Quantitative histological study of seasonal functional zonation of adrenocortex in Starling. Proc. 23th Internithal. Orn. Conf. p. 319.Google Scholar
- 22.Sarkar, A. K., Mukherjee, R. N. (1978) Sex-steroid genesis in adrenal of caponized domestic pigeon, Columba livia Indian. J. Exp. Biol. 16, 1181–1182.Google Scholar
- 27.Vanson, A., Arnold, A. P., Schlinger, B. A. (1996) 3-Beta-hydroxysteroid dehydrogenase and aro-matase activity in primary cultures of developing Zebra finch telencephalon: dehydroepiandrosterone as substrate for synthesis of androstenedione and estrogen. Gen. Comp. Endocrinol. 102, 342–350.CrossRefGoogle Scholar
- 28.Wingfield, J. C., Soma, K. (2000) Autumn and spring territotality: same behaviour, different mechanism? 7th International Symposium on Avian Endocrinology, Varanasi, U.P. India.Google Scholar
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.