Abstract
DESPITE many studies, the effects and actions of sex steroids on the avian gonad are not understood clearly. Moore and Morgan (1942) and Lahr and Riddle (1944) have summarized much of the literature. A bird such as the starling offers advantages for study because by photoperiodic manipulations the testis can be placed at a desired level of spermatogenetic activity whereby the annual cycle can be studied in its individual parts. A previous study on the starling (Burger 1944) found that testosterone delayed the response of the initially inactive testis to the stimulation evoked by “long days.” This exogenous steroid did not effect spermatogenesis in testes which were already producing sperm. In the present study, some effects of estradiol and further effects of testosterone are reported. Of special interest is the response, novel for the bird, of the testis to estradiol. Table 1 records the various experimental treatments. Of the two light rations used, 14 hours daily light (long days) will induce complete ...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
