Fertility Monitors

Fertility is a measure of reproduction: the number of children born per couple, person or population. This is different to fecundity, which is defined as the potential for reproduction (influenced by gamete production, fertilisation and carrying a pregnancy to term). more...

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In the English language, the term was originally applied only to females, but increasingly is applied to males as well, as common understanding of reproductive mechanisms increases and the importance of the male role is better known. The opposite of fertility is infertility.

Human fertility depends on factors of nutrition, sexual behavior, culture, instinct, endocrinology, timing, economics, way of life, and emotions. Animal fertility is no less complex, and may display astounding mechanisms.

Agriculture

See also arable land, soil fertility, harvest, Neolithic revolution.

Fertility is also applied to farmlands and plants, where it implies a capacity to yield large crops of sound fruits, seeds or vegetables.

Demographics

The fertility rate is a demographic measure of the number of children per woman. Although it has been until recently considered to be a fairly reliable indicator of population growth, it is no longer so in much of Asia. Due to selective abortion and other factors, the number of women themselves is declining. Therefore, the fertility rate as it has traditionally been defined is no longer an authoritative measure of population growth in China, India, and Myanmar.

Human fertility

Both women and men have hormonal cycles which determine both when a woman can achieve pregnancy and when a man is most fertile. The female cycle is approximately twenty-eight days long, but the male cycle is variable. Women ovulate at about the fourteenth day of their cycle, this obviously being the most fertile time for females (The 14th day is considered a common myth: ). Men can ejaculate and produce sperm at any time of the month, but their libido dips occasionally, which scientists guess is in relation to their internal cycle. A study done in Mexico suggests that men's libido levels are also sometimes correlated to their partner's monthly cycle.

During the fourteenth week of fetal growth, the eggs (or ova) form in the ovaries of a female fetus, where they will remain until puberty. At puberty, the eggs will eventually start to mature one-by-one. At ovulation, the egg bursts from the ovary sometimes causing a small, sharp pain called mittelschmerz (German for "middle pain"). If the egg is not fertilized by the male’s sperm, the egg will break down within twenty-four hours into its components (mostly protein) and be reabsorbed by the body.

A study suggests that women dress more provocatively when they are at their most fertile .

Read more at Wikipedia.org