Influence of Ovulation and Gonadal Hormones on Shell Formation in the Domestic Fowl

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The insertion of artificial yolk into the empty oviduct was performed to investigate the shell formation in the fowl.The insertion of ratificial yolk into the oviduct of hens within 1hr before the expected time of ovulation resulted in a normal deposition of shell. When the insertion was made 1hr and 9-10hr after Ct oviposition of a clutch or 7-8hr after ovulation, all artificial yolks were laid as soft-shelled eggs. However, when estrogen was injected 7-8hr, i.e. 9-10hr after Ct oviposition of a clutch, before the insertion, shell deposited around eggs containing artificial yolk. The effect of estrogen in combination with androgen on shell formation was almost similar to that of estrogen alone and oxytocin seemed to exert no effect on the shell formation.
日本家禽学会の論文