|Sex steroids and their involvement in the cortisol-induced inhibition of pubertal development in male common carp
Consten, D. ; Keunig, A. ; Bogerd, J. ; Zandbergen, Th. ; Lambert, J. ; Komen, J.G.D. ; Goos, H.J.Th. - \ 2002
Biology of Reproduction 67 (2002). - ISSN 0006-3363 - p. 465 - 472.
|Corticosteroids affect the testicular androgen production in male common carp, Cyprinus carpio L.
Consten, D. ; Lambert, J.G.D. ; Komen, J. ; Goos, H.J.Th. - \ 2002
Biology of Reproduction 66 (2002). - ISSN 0006-3363 - p. 106 - 111.
Long term cortison treatment inhibits pubertal development in male common carp, Cyprinus carpio L.
Consten, D. ; Bogerd, J. ; Komen, J. ; Lambert, J.G.D. ; Goos, H.J.Th. - \ 2001
Biology of Reproduction 64 (2001). - ISSN 0006-3363 - p. 1063 - 1071.
The onset and regulation of puberty is determined by functional development of the brain-pituitary-gonad (BPG) axis. Stress has been shown to interfere with reproduction and the functioning of the BPG axis. The response to chronic and severe stress may require much energy and force the organism to make adaptive choices. Energy that is normally available for processes like growth, immune response, or reproduction will be channeled into restoration of the disturbed homeostasis. Cortisol plays a key role in the homeostatic adaptation during or after stress. In the present study, immature common carp were fed with cortisol-containing food pellets covering the pubertal period. We showed that cortisol caused an inhibition of pubertal development, by affecting directly or indirectly all components of the BPG axis. The salmon GnRH content of the brain was decreased. Luteinizing hormone- and FSH-encoding mRNA levels in the pituitary and LH plasma levels were diminished by long-term cortisol treatment, as was the testicular androgen secretion. Testicular development, reflected by gonadosomatic index and the first wave of spermatogenesis, was retarded.
Set up field experiments to study physical and chemical processes in acid sulfate soils in the Pulau Petak area, South-Kalimantan, Indonesia
Bronswijk, J.J.B. ; Consten, C.J.M. ; Nugroho, K. - \ 1988
Wageningen : ICW (ICW nota 1901) - 24
zure gronden - kattekleigronden - proefvelden - experimenteel veldonderzoek - proeven - kalimantan - borneo - acid soils - acid sulfate soils - experimental plots - field experimentation - trials - kalimantan - borneo