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Discharge of an ovum or ovule from the ovary.



the discharge of the ovum from the ovary into the body cavity. The follicle that contains the ovum ruptures during ovulation; in humans and mammals it is called the Graafian follicle. Ovulation occurs periodically in females of most vertebrates and in women. In some animals, for example, the rabbit, cat, and polecat, it is triggered by copulation. It is stimulated by gonadotrophic hormones, which are secreted by the pituitary gland and are controlled by the central nervous system. In birds the number of daylight hours is a signal for ovulation; in fish, water temperature.

References in periodicals archive ?
Ovulation induction protocol using equine chorionic gonadotropin and porcine luteinizing hormone in the weaned sow.
Synchronization of ovulation in cyclic gilts with porcine luteinizing hormone (pLH) and its effects on reproductive function.
Parameters recorded were: (i) behavioral and secondary signs of estrus, (ii) periovulatory LH, total estrogen and progesterone profile and (iii) timing of ovulation in relation to EB treatment and to the preovulatory estrogen and LH surges.
The timing of insemination was based on the timing of ovulation recorded in buffaloes under experiment 1.
Resumption of oocyte development occurs near the time of ovulation and is related to disruption of gap junctions brought about by the preovulatory surge of LH.
Such changes are prerequisites for later stages of oocyte development that occur following ovulation.
Thiazolidinediones (TZDs) improve ovulation rates as well (SOR: B, based on low-quality RCTs).
Pierson hailed it as more effective than standard birth control pills at suppressing ovulation, and likely to become the most popular form of birth control.
Designed to help a woman maximize her chance of conception by identifying her most fertile time of the month, the First Response One-Step Ovulation Predictor Test is an easy method to help women find the two days when she is most able to become pregnant.
Thus, the objective of this study was to evaluate whether supplemental LH given at the end of the FSH treatment changes the time to ovulation (synchronous ovulation) and increases the ovulation rate and embryo yield in Santa Ines ewes.
Moreover, the researchers calculated that these 105 women each averaged 388 ovulation cycles in her life so far, nearly 30 full years' worth, while the ovarian cancer patients without the p53 protein surplus averaged only 342 cycles.
Marcos Arevalo, director of biomedical research at the Institute for Reproductive Health at Georgetown University in Washington, DC, the study's "data on the day of ovulation, and the fact that actual ovulation occurs only once in a cycle, provide support for the efficacy of natural family planning methods.