Effect of exogenous serum gonadotrophin (PMS) on aspects of reproductive development in female domesticated canaries

摘要: PMS was injected thrice weekly for four weeks into first winter and second canaries during the following periods: September-October, November-December, January-February February-March. Measures were made of ovary oviduct weight, brood-patch development (defeathering, vascularity sensitivity changes), nest-building egg-laying. caused overy growth in all months: this greatest year birds February. Both control treated ovaries increased size towards breeding season. Oviduct depends mainly on ovary. Defeathering produced by its rate extent Vascularity also PMS. It least November-December but after that at which it appeared By contrast, effect skin greater autumn group than subsequently. Nest-building occurred then very slight until February-March, is beginning Eggs laid most months; fewer injections needed to produce egg-laying as season approached.