By G. Pethes, P. Péczely and P. Rudas (Eds.)

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Additional info for Recent Advances of Avian Endocrinology. Satellite Symposium of the 28th International Congress of Physiological Sciences, Szkésfehérvár, Hungary, 1980

Example text

1971; Zanisi et a l . 6) and that in other species of Mammals it can stimulate male sexual behavior when given alone or in combination with estradiol (Alsum and Goy, Phoenix, Agmo and Sodersten Payne and Bennet, 5a-DHP has been found to exert a positive feedback effect on LH release in the female r a t , although to a smaller extent than progesterone (Zanisi and Martini, Nuti and Karavolas, Kraulis et a l . , In the pituitary gland and the central nervous system of Birds the conversion of testosterone into 5a-DHT occurs to a lesser extent than in Mammals; however, in Birds testosterone is largely metabolized through pathways of 5 3-reduction (Nakamura and Tanabe, 197^; Massa et a l .

The highest concentrations were found in mesencephalon, telencephalon, namely paleostriatum, while the lowest were in cerebellum. Interesting is the finding of a considerable lower serotonin content in the epiphysis of quails. 47 In mammals a far highest concentration was found in that tissue. Reports being concerned with the effect of stress on the serotonin content in mammalian brain are rather different. While in some experiments stress caused the decrease of serotonin content (Curzon 1971> Vermes et al.

And Cunningham, F. J. (1973). Luteinizing hormone and progesterone in peripheral blood during the ovulatory cycle of the hen Gallus domesticus. J. Endocrinol. : 159169. Graber, J. W . and Nalbandov, A. V. (1976). Peripheral estrogen levels during the laying cycle of the hen (Gallus domesticus). Biol. Reprod. 14: 109-114. Hattori, M. and Wakabayashi, K. (1979). Isoelectric focusing and gel filtration studies on the heterogeneity of avian pituitary luteinizing hormone. Gen. Comp. Endocrinol. 39: 215-221.

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