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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 ?
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.
Such changes are prerequisites for later stages of oocyte development that occur following ovulation.
The wave that ends with ovulation is typically referred to as the ovulatory wave, whereas waves that do not lead to ovulation are known as anovulatory waves.
1,2) By selecting RCTs, performing precise statistical analysis according to the Cochrane protocols, and clearly stating limitations, this review gives good evidence that metformin modestly increases the odds of ovulation for women with PCOS (odds ratio [OR] = 3.
Several problems with recommending metformin as first-line therapy exist: (1) equal or better ovulation rates have been described by using lifestyle interventions to achieve weight loss, (2) there are no long-term studies of the effects of metformin in PCOS patients, and (3) we cannot assess the clinically important outcome of pregnancy rates because the trials did not control for other infertility factors and did not define live births as a primary outcome.
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.
Table 1-Interval onset of oestrus to ovulation (h) and oestrus duration (h) of gilts submitted to application of porcine luteinising hormone (pLH) at oestrus onset using different dosages.
NFP will not fail because of a second fertile period or secondary ovulation in the same cycle," says Spieler, who has conducted studies on ovulation.