Abstract: The aim of this study is to determine the ovulation duration of domestic cats after superovulation during their nonbreeding seasons . After the treatment with twice injection of 150 IU of pregnant mares’serum , the hot queens were injected with hCG(100 IU per cat)after the treatment with PMSG and allowed to coitus with males in following 24 h. The ovulation assessment was initiated in 24 h,30 h and 36 h after the first copulation by ovariohysterectom, and the embryos were recovered from the oviducts. The results showed that all adults responded with artificially induced estrus during the nonbreeding seasons, and the ovulation in most queens was mainly initiated in 30 h after the first copulation.

Key words: domestic cat; non-breeding season; ovulation