Possible Secretion of the Oviposition-Inducing Factor after Oviposition of the Terminal Egg of a Clutch Sequence

Abstract

To estimate whether the oviposition-inducing factor (OIF) is released other than at the time of oviposition, spontaneous oviposition of the terminal (Ct) egg of a clutch sequence was prevented by ligation of the vagina for a short period.Of 51 hens, 17 laid their retained Ct eggs on the day of operation, 25 laid about 1hr before Cl ovulation the next day after the operation, and 9 laid on the third day in association with ovulation.

The Influence of Hypophysectomy on the Time of Oviposition in Hens.

“…The retained egg in the uterus by the short term vaginal ligation is expelled from the uterus in association with ovulation (NAKADA and TANAKA , 1990). These results adduce some additional evidence suggesting that the ovulation process participates in the regulation of oviposition.…”