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Effect of male vocalizations on the nest-occupation response of female budgerigars to oestrogen and prolactin

In the canary, the nest-building response of ovariectomized females to exogenous oestrogen is affected both by the length of the photoperiod (Steel & Hinde, 1972) and by male vocalizations (Hinde & Steel, 1976). Gosney & Hinde (1975) showed a similar effect of photoperiod on an analagous behaviour in the budgerigar; oestrogen-treated ovariectomized birds entered the nest-box sooner and spent longer periods within if kept in a long-day than in a short-day photoperiod. In view of the essential role of male vocalizations on reproductive development in the female budgerigar (review by Brockway, 1969) the present paper investigates the effect of male vocalizations on hormone-induced nest-box occupation by ovariectomized female budgerigars.