Thyroidectomy of Starlings prior to exposure to long photoperiods (17L:7D) resulted in a failure of testes to regress after a n initial size increase. Thyroidectomy after four weeks of such exposure resulted i n testicular regression followed by a second period of size increase. Testicular size was
Some effects of flashing light on testicular activation in the male starling (Sturnus vulgaris)
β Scribed by Burger, J. Wendell ;Bissonnette, T. H. ;Doolittle, H. D.
- Publisher
- John Wiley and Sons
- Year
- 1942
- Tongue
- English
- Weight
- 513 KB
- Volume
- 90
- Category
- Article
- ISSN
- 0022-104X
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Bissonnette ('30 et. seq.) first showed for the male starling that periods of artificial illumination, usually of about 6 hours when added daily to natural fall and winter day-lengths, will induce a precocious spermatogenesis. In an opposite direction, a reduction in the daily length of exposure to
## Abstract Gonadotropinβreleasing hormoneβI (GnRHβI) cells are localized primarily to the septopreoptic area (POA) and are responsible for regulating gonadotropin release from the anterior pituitary. Some songbird species exhibit dramatic seasonal variation in the number of detectable GnRHβI immun