High impact information on Fertile Period

• However, considering that the cyclical secretion of estrogen normally begins in early adolescence and continues over the entire fertile period, one could argue that focusing on perimenopause alone may be too narrow [1].
• Female reproductive activity depends upon cyclic morphofunctional changes of the ovarian tissue during the female's fertile period, but the primum movens of an active gonadal rearrangement can be found from early phases of embryo development [2].
• Whether an age-related decrease in androgen secretion, as in normal women, also occurs in women with polycystic ovary syndrome (PCOS) and whether the enhanced androgen production in PCOS remains throughout the fertile period of life are not known [3].
• The level of education was inversely associated with RA, while there was a positive association between RA and certain residential factors in men and a short fertile period in women [4].
• Urinary androgens did not show an inverse relationship to prolactin in male tamarins, but were elevated concurrent with the female's fertile period [5].

Biological context of Fertile Period

• With optimized algorithms and the best index of ovulation, the estrogen test delineated the limits of the fertile period in 89% of the tests (mean length, 10.8 days; range, 5 to 17 days) and the time of maximum conception probability in 82% of the cycles, with a mean time to the maximum follicular diameter of 0.42 days (range, -4 to +4 days) [6].
• BACKGROUND: The concentration of steroid glucuronides in serial samples of early morning urine (EMU) can be used to predict the fertile period in the female menstrual cycle [7].

Associations of Fertile Period with chemical compounds

• Defined changes in the concentration of estrone glucuronide in daily samples of early morning urine have been used to locate the limits of the fertile period and the time of maximum conception probability during 118 cycles (106 menstrual, 12 conceptional) in 73 women [6].
• For the prediction of ovulation or fertile period, the best index of urinary steroids appears to be the sustained rise in the ratio of E1G to C [8].
• Systems using LH and estrone-3-glucuronide (E3G) have also demonstrated accurate detection of the fertile period [9].
• The recent advent of in-house canine-specific progesterone assays allows accurate identification of the fertile period of the bitch [10].

Gene context of Fertile Period

• In contrast, a spe-26 mutant had a tenfold lower mortality until approximately 2 weeks of age but ultimately achieved a higher mortality, whereas clk-1 mutants show slightly higher mortality than wild type during the fertile period, early in life, but ultimately level off at lower mortality [11].
• The measurement of urinary steroid glucuronides as indices of the fertile period in women. World Health Organization, Task Force on Methods for the Determination of the Fertile Period, special programme of research, development and research training in human reproduction [12].

References