ovarian cycle

Because primordial follicles can be dormant for up to 50 years in the human, the length of the ovarian cycle does not include this time.

This is the normal ovarian cycle.

"Stress can really influence the regularity of an ovarian cycle," Dr. Erskine said.

They control spermatogenesis and the ovarian cycle, parturition, lactation, and maternal behaviour.

In captivity, female white-faced sakis experience ovarian cycles of approximately 17 days, and a gestational period of 20-21 weeks.

One of the most important functions of the HPG axis is to regulate reproduction by controlling the uterine and ovarian cycles.

Researchers and scientists can use this information to determine where a female quoll is in her ovarian cycle, which is anticipated to be helpful in breeding management.

Julie Mennella, who studies breast-feeding women, designed the study with me after hearing anecdotes from breast-feeding women suggesting that their ovarian cycles were affected by this.

Unlike humans, dogs have a long late phase of their ovarian cycle during which an ovarian structure called the corpus luteum produces large amounts of progesterone.

The females' male or female courtship roles are determined by their ovarian cycles; as the lizard ovulates, its behavior becomes less like a female's and more like a male's.

In sub-dominant males, appears that lutenizing hormone and testosterone are suppressed while in females it appears that the suppression involves the entire suppression of the ovarian cycle.

In females FSH and LH act primarily to activate the ovaries to produce estrogen and inhibin and to regulate the menstrual cycle and ovarian cycle.

Therefore, this study proposed that there are two types of pheromone involved: "One, produced prior to ovulation, shortens the ovarian cycle; and the second, produced just at ovulation, lengthens the cycle".

Such factors suppress the activity of the centers in the brain that stimulate the ovaries during the ovarian cycle (to secrete hormone like estrogen and progesterone), and may result in low production of these hormones.

When energy balance is highly negative (meaning the woman is starving) or energy flux is very high (meaning the woman is exercising at extreme levels, but still consuming enough calories), the ovarian cycle stops and females stop menstruating.

The synthetic progesterone prevent the hypothalamus from releasing GnRH and the pituitary from releasing LH and FSH; therefore it prevents the ovarian cycle from entering the menstrual phase and prevents follicle development and ovulation.