MRC Unit on the Development and Integration of Behaviour, Madingley, Cambridge, CB3 8AA
(Received 29 May 1974)
Intra-hypothalamic testosterone propionate (TP) implants are less effective in evoking pre-copulatory courtship behaviour in long-term (90-day) than in short-term (30-day) castrated male doves, suggesting that there is a decline in sensitivity to androgen after castration (Hutchison, 1969). Because photoperiod was shortened from 13 h/day to 8·5 h/day immediately after castration in this experiment, it was not possible to establish whether the decline in effectiveness of intra-hypothalamic TP was due to the effects of shortening the photoperiod or to the prolonged absence of gonadal hormones. The object of the experiment reported here was to determine whether castrated doves maintained on a long photoperiod (13 h/day) showed a similar decline in behavioural responsiveness to intra-hypothalamic TP.
The experimental methods have been described previously (Hutchison, 1971). Males were brought in from outside aviaries for a period
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