Hypothalamic and hormonal control of photoperiodically induced vernal functions in the white-crowned sparrow, Zonotrichia leucophrys gambelii. 2. The effects of hypothalamic inplantation of testosterone propionate.


The effects of implantation of testosterone propionate (TP) in various sites in the hypothalamus on the photoperiodically induced vernal premigratory functions in the White-crowned Sparrows were investigated in order to assess the role of the hypothalamo-hypophysial-testicular axis in the induction of these responses. Implantation of glass capillary tubes… (More)


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