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Agriculture

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

Cause of decline

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; * In males 20–39 years old, 90% of the seminiferous tubules contain mature sperm. * In males 40–69 years old, 50% of the seminiferous tubules contain mature sperm. * In males 80 years old and older, 10% of the seminiferous tubules contain mature sperm.[15] Recent research has suggested increased risks for health problems for children of older fathers. A large scale Israeli study found that the children of men 40 or older were 5.75 times more likely than children of men under 30 to have an autism spectrum disorder, controlling for year of birth, socioeconomic status, and maternal age.[17] Increased paternal age has also been correlated to schizophrenia in numerous studies.[18][19][20] The American Fertility Society recommends an age limit for sperm donors of 50 years or less,[21] and many fertility clinics in the United Kingdom will not accept donations from men over 40 or 45 years of age. [22] In part because of this fact, more women are now using a take-home baby rate calculator to estimate their chances of success following invitro fertilization. [23]

Cohort measures

* Age-specific fertility rate (ASFR) - The number of births in a year to women in a 5-year age group, divided by the number of all women in that age group, times 1000. The usual age groups are 10-14, 15-19, 20-24, etc. * Total fertility rate (TFR) - the total number of children a woman would bear during her lifetime if she were to experience the prevailing age-specific fertility rates of women. TFR equals the sum for all age groups of 5 times each ASFR rate.[3] * Gross Reproduction Rate (GRR) - the number of girl babies a synthetic cohort will have. It assumes that all of the baby girls will grow up and live to at least age 50. * Net Reproduction Rate (NRR) - the NRR starts with the GRR and adds the realistic assumption that some of the women will die before age 59; therefore they will not be alive to bear some of the potential babies that were counted in the GRR. NRR is always lower than GRR, but in countries where mortality is very low, almost all the baby girls grow up to be potential mothers, and the NRR is practically the same as GRR. In countries with high mortality, NRR can be as low as 70% of GRR. When NRR = 1.0, each generation of 1000 baby girls grows up and gives birth to exactly 1000 girls. When NRR is less than one, each generation is smaller than the previous one. When NRR is greater than 1 each generation is larger than the one before. NRR is a measure of the long-term future potential for growth, but it usually is different from the current population growth rate.

Demography

In demographic contexts, fertility refers the actual production of offspring, rather than the physical capability to produce which is termed fecundity.[1][2] While fertility can be measured, fecundity cannot be. Demographers measure the fertility rate in a variety of ways, which can be broadly broken into "period" measures and "cohort" measures. "Period" measures refer to a cross-section of the population in one year. "Cohort" data on the other hand, follows the same people over a period of decades. Both period and cohort measures are widely used.

Description

Fertility is the natural capability of giving life. As a measure, "fertility rate" is the number of children born per couple, person or population. This is different from fecundity, which is defined as the potential for reproduction (influenced by gamete production, fertilisation and carrying a pregnancy to term). Infertility is a deficient fertility. Human fertility depends on factors of nutrition, sexual behavior, culture, instinct, endocrinology, timing, economics, way of life, and emotions.

Easterlin Model

American Economist Richard Easterlin developed a theory (the Easterlin Model) to explain the Baby Boom. He assumes first that young couples try to achieve a standard of living equal to or better than they had when they grew up. This is called "relative status"; in other words, young men in one cohort compare themselves now to where their own fathers in a previous cohort had been. Second, Easterlin assumes that when jobs are plentiful, it will be easier to marry young and have more children and still match that standard of living. But when jobs are scarce, couples who try to keep that standard of living will wait to get married and have fewer children. For Easterlin, the size of the cohort is a critical determinant of how easy it is to get a good job. A small cohort means less competition, a large cohort means more competition to worry about. The assumptions blend economics and sociology, and Easterlin did not rely on surveys or interviews asking people what really motivated them.

Female fertility

The average age of menarche in the United States is about 12.5 years.[6] In postmenarchal girls, about 80% of the cycles were anovulatory in the first year after menarche, 50% in the third and 10% in the sixth year.[7][8] Women's fertility peaks around the age of 19-24, and often declines after 30.[citation needed] With a rise in women postponing pregnancy,[9] this can create an infertility problem. Of women trying to get pregnant, without using fertility drugs or in vitro fertilization: * At age 30, 75% will get pregnant within one year, and 91% within four years. * At age 35, 66% will get pregnant within one year, and 84% within four years. * At age 40, 44% will get pregnant within one year, and 64% within four years.[10] The above figures are for pregnancies ending in a live birth and take into account the increasing rates of miscarriage in the aging population. According to the March of Dimes, "about 9 percent of recognised pregnancies for women aged 20 to 24 ended in miscarriage. The risk rose to about 20 percent at age 35 to 39, and more than 50 percent by age 42".[11] Birth defects, especially those involving chromosome number and arrangement, also increase with the age of the mother. According to the March of Dimes, "At age 25, a woman has about a 1-in-1,250 chance of having a baby with Down syndrome; at age 30, a 1-in-1,000 chance; at age 35, a 1-in-400 chance; at age 40, a 1-in-100 chance; and at 45, a 1-in-30 chance."[12] The use of fertility drugs and/or invitro fertilization can increase the chances of becoming pregnant at a later age. Successful pregnancies facilitated by fertility treatment have been documented in women as old as 67.[13] Doctors recommend that women over 30 who have been unsuccessful in trying to conceive for more than 6 months undergo some kind of fertility testing.[14]

France

The French pronatalist movement from 1919-1945 failed to convince French couples of having a patriotic duty to help increase their country's birthrate. Even the government was reluctant in its support to the movement. It was only between 1938 and 1939 that the French government became directly and permanently involved in the pronatalist effort. Although the birthrate started to surge in late 1941, the trend was not sustained. Falling birthrate one again became a major concern among demographers and government officials beginning in the 1970s.[24]

Further reading

* Guides to infertility - UK Regulator * Jorge Chavarro (2009) The Fertility Diet: Groundbreaking Research Reveals Natural Ways to Boost Ovulation and Improve Your Chances of Getting Pregnant, McGraw-Hill Professional. ISBN 978-0-07-162710-8 * Bock J (2002). "Introduction: evolutionary theory and the search for a unified theory of fertility" (PDF). Am. J. Hum. Biol. 14 (2): 145–8. doi:10.1002/ajhb.10039. PMID 11891930. http://anthro.fullerton.edu/jbock/BockIntroAJHB.pdf.  * Jones C (March 2008). "Ethical and legal conundrums of postmodern procreation". Int J Gynaecol Obstet 100 (3): 208–10. doi:10.1016/j.ijgo.2007.09.031. PMID 18062970. 

Human fertility

Both women and men 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 the male cycle is 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 a role, especially for women.

Male fertility and age

Erectile dysfunction increases with age,[15] but fertility does not decline in men as sharply as it does in women. There have been examples of males being fertile at 94 years old.[15] However, evidence suggests that increased male age is associated with a decline in semen volume, sperm motility, and sperm morphology.[16] 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%.[16]

Menstrual cycle

Although women can become pregnant at any time during their menstrual cycle, peak fertility occurs during just a few days of the cycle: usually two days before and two days after the ovulation date[4]. This fertile window, varies from woman to woman, just as the ovulation date often varies from cycle to cycle for the same woman[5]. The ovule is usually capable of being fertilized for up to 48 hours after it is released from the ovary. Sperm survive inside the uterus between 48 to 72 hours on average, with the maximum being 120 hours (5 days). These periods and intervals are important factors for couples using the rhythm method of contraception.

Period measures

* Crude birth rate (CBR) - the number of children live births in a given year per 1,000 people alive at the middle of that year. One disadvantage of this indicator is that it is influenced by the age structure of the population. * General fertility rate (GFR) - the number of births in a year divided by the number of women aged 15–44, times 1000. It focuses on the potential mothers only, and takes the age distribution into account. * Child-Woman Ratio (CWR) - the ratio of the number of children under 5 to the number of women 15-49, times 1000. It is especially useful in historical data as It does not require counting births. This measure is actually a hybrid, because it involves deaths as well as births. (That is, because of infant mortality some of the births are not included; and because of adult mortality, some of the women who gave birth are not counted either.) * Coale's Index of Fertility - a special device used in historical research

Post-WW II USA

From 1800 to 1940, fertility fell steadily in the US . Then suddenly it started going up again, reaching a new peak in 1957. After 1960, fertility started declining rapidly. In the Baby Boom years (1940-1964), women married earlier and had their babies sooner; the number of children born to mothers after age 35 did not increase. After 1960, ideal family size fell sharply, from 3 to 2 children. Couples postponed marriage and first births, and they sharply reduced the number of third and fourth births.

References

This article incorporates material from the Citizendium article "Fertility (demography)", which is licensed under the Creative Commons-Attribution-ShareAlike 3.0 Unported License but not under the GFDL. * Barrett, Richard E., Donald J. Bogue, and Douglas L. Anderton. The Population of the United States 3rd Edition (1997) compendium of data * Coale, Ansley J. and Susan C. Watkins, eds. The Decline of Fertility in Europe, (1986) * Eversley, D. E. C. Social Theories of Fertility and the Malthusian Debate (1959) online edition * Garrett, Eilidh ety al. Family Size in England and Wales: Place, Class, and Demography, 1891-1911(2001) online edition * Grabill, Wilson H.. Clyde V. Kiser, Pascal K. Whelpton. The Fertility of American Women (1958), influential study at the peak of the Baby Boom online edition * GuzmÁn, JosÉ Miguel et al. The Fertility Transition in Latin America (1996) online edition * Haines, Michael R. and Richard H. Steckel (eds.), A Population History of North America. Cambridge University Press, 2000, 752 pp. advanced scholarship * Hawes, Joseph M. and Elizabeth I. Nybakken, eds. American Families: a Research Guide and Historical Handbook. (Greenwood Press, 1991) * Klein, Herbert S. A Population History of the United States. Cambridge University Press, 2004. 316 pp * Knox, P. L. et al. The United States: A Contemporary Human Geography. Longman, 1988. 287 pp. * Kohler, Hans-Peter Fertility and Social Interaction: An Economic Perspective (2001) online edition * Leete, Richard. Dynamics of Values in Fertility Change (1999) online edition * Lovett, Laura L. Conceiving the Future: Pronatalism, Reproduction, and the Family in the United States, 1890-1938, (2007) 236 pages; * Mintz Steven and Susan Kellogg. Domestic Revolutions: a Social History of American Family Life. (1988) * Pampel, Fred C. and H. Elizabeth Peters, "The Easterlin Effect," Annual Review of Sociology (1995) v21 pp 163-194] * Population Reference Bureau, Population Handbook (5th ed. 2004) online (5th ed. 2004). * Reed, James. From Private Vice to Public Virtue: The Birth Control Movement and American Society Since 1830. 1978. * Tarver, James D. The Demography of Africa (1996) online edition * Weeks, John R. Population: An Introduction to Concepts and Issues (10th ed. 2007), standard textbook

See also

* Birth control * Demographic-economic paradox * Family economics * Family planning * Fertility clinic * Fertility tourism * Fertility deity * Fertility preservation * Fertility and intelligence * Human Fertilisation and Embryology Authority * Natural fertility * Oncofertility * Reproductive health * Total fertility rate

Social determinants of fertility

The "Three-step Analysis" of the fertility process was introduced by Kingsley Davis and Judith Blake in 1956 and makes use of three proximate determinants: