| Autor: |
Mattocks PW Jr |
| Jazyk: |
angličtina |
| Zdroj: |
General and comparative endocrinology [Gen Comp Endocrinol] 1985 Dec; Vol. 60 (3), pp. 455-62. |
| DOI: |
10.1016/0016-6480(85)90081-4 |
| Abstrakt: |
Elimination of gonadal-hormone feedback by castration from photorefractory male White-crowned sparrows in mid-July or early October, and from photosensitive males in early December, had no significant effect on plasma levels of LH. Photorefractory birds held on natural daylengths regained photosensitivity in the absence of gonadal-hormone feedback with no increase in plasma levels of LH. Implants of testosterone propionate into castrated males during November and December had no effect on plasma LH levels. These results indicate that gonadal-hormone feedback is not responsible for the very low levels of LH secretion in either the photorefractory or the photosensitive male White-crowned sparrow. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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