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Fertility

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Fertility

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Fertility

  1. 1. Fertility http://www.fertilityspells.co.za Fertility is the natural capability to produce offspring. As a measure, "fertility rate" is the number of offspring born per mating pair, individual or population. Fertility differs from fecundity, which is defined as the potential for reproduction (influenced by gamete production, fertilization and carrying a pregnancy to term). A lack of fertility is infertility while a lack of fecundity would be called sterility. Human fertility depends on factors of nutrition, sexual behavior, culture, instinct, endocrinology, timing, economics, way of life, and emotions. Men and women have hormonal cycles which determine both when a woman can achieve pregnancy and when a man is most virile. The female cycle is approximately twenty-eight days long, but can deviate greatly from this "norm". The male cycle is also variable. Men can ejaculate and produce sperm at any time of the month, but their sperm quality dips occasionally, which scientists guess is in relation to their internal cycle. Furthermore, age also plays an equally significant role for both men and women. The average age of menarche in the United States is about 12.5 years. In postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, 50% in the third and 10% in the sixth year. Women's fertility peaks in the early 20s, and drops considerably after age 35. Menopause typically occurs during a women's midlife (usually between ages 45 and 55. During menopause, hormonal production by the ovaries is reduced, eventually causing a permanent cessation of the primary function of the ovaries, particularly the creation of the uterine lining (period). This is considered the end of the fertile phase of a woman's life. Evidence shows that increased male age is associated with a decline in semen volume, sperm motility, and sperm morphology. In studies that controlled for female age, comparisons between men under 30 and men over 50 found relative decreases in pregnancy rates between 23% and 38%. Sperm count declines with age, with men aged 50–80 years producing sperm at an average rate of 75% compared with men aged 20–50 years. However, an even larger difference is seen in how many of the seminiferous tubules in the testes contain mature sperm; Fertility spells http://www.fertilityspells.co.za Pregnancy spells http://www.lostlovespellcaster.co.za/pregnancy-spells.html Fertility spells http://www.lostlovespellcaster.co.za/fertility-spells.html Pregnancy spells http://www.pregnancyspells.co.za Fertility spells for men http://www.fertilityspells.co.za/fertility-spells-for-men.html
  2. 2. Fertility spells for women http://www.fertilityspells.co.za/fertility-spells-for-women.html Fertility spells for twins http://www.fertilityspells.co.za/fertility-spells-for-twins.html Natural fertility http://www.fertilityspells.co.za/natural-fertility.html Women & fertility http://www.fertilityspells.co.za/women-and-fertility.html Men & fertility http://www.fertilityspells.co.za/men-and-fertility.html Boost fertility in men http://www.fertilityspells.co.za/boost-fertility-in-men.html Boost fertility in women http://www.fertilityspells.co.za/boost-fertility-in-women.html Fertility herbs http://www.fertilityspells.co.za/fertility-herbs.html Male infertility http://www.fertilityspells.co.za/male-infertility.html Female fertility http://www.fertilityspells.co.za/female-fertility.html

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