Results 211 to 220 of about 49,256 (259)
Some of the next articles are maybe not open access.
Epidemiology, 1998
Animal studies have shown evidence of prenatal hormonal interaction between unlike sexed fetuses, including reduced fertility among females. We evaluated whether the fecundability of female twins is different from that of singletons and whether it differs according to the sex of the co-twin.
Christensen, Kaare +6 more
openaire +2 more sources
Animal studies have shown evidence of prenatal hormonal interaction between unlike sexed fetuses, including reduced fertility among females. We evaluated whether the fecundability of female twins is different from that of singletons and whether it differs according to the sex of the co-twin.
Christensen, Kaare +6 more
openaire +2 more sources
Studies in Family Planning, 1980
The current hypothesis that malnutrition impairs fecundity has recently been challenged by a number of investigations that examined the nutrition fecundity link. The controversy is important because of the potential implications for food aid programs for developing countries. If improving nutrition improves increases birth rates this would exacerbate
openaire +2 more sources
The current hypothesis that malnutrition impairs fecundity has recently been challenged by a number of investigations that examined the nutrition fecundity link. The controversy is important because of the potential implications for food aid programs for developing countries. If improving nutrition improves increases birth rates this would exacerbate
openaire +2 more sources
On the heterogeneity of fecundability
Lifetime Data Analysis, 1996We propose to use a general mixing distribution in modeling the heterogeneity of the fecundability of couples. We introduce a sequence of parameters called canonical moments, which is in one to one correspondence with the moments, to characterize the mixing distribution.
openaire +2 more sources
Sterility and fecundability estimation
Journal of Theoretical Biology, 1983The percentage of steriles and the fecundability of non-steriles among a given population can be estimated by a probabilistic model from observations made on delays to first conception. The maximum likelihood method of estimation that was used takes into account all available information, though some of these observations may be incomplete due to a ...
P, Maruani, D, Schwartz
openaire +2 more sources
JAAPA, 2021
ABSTRACT Premenopausal transgender men who retain internal female reproductive organs, who use exogenous testosterone, and who are sexually active with cisgender men are often capable of conception. This article discusses the potential for fecundity in transgender men, as well as appropriate reproductive care depending on whether the patient ...
openaire +2 more sources
ABSTRACT Premenopausal transgender men who retain internal female reproductive organs, who use exogenous testosterone, and who are sexually active with cisgender men are often capable of conception. This article discusses the potential for fecundity in transgender men, as well as appropriate reproductive care depending on whether the patient ...
openaire +2 more sources
Fertility, Fecundity, Fecundability
Abstract Fertility, fecundity, and fecundability are all terms used to describe aspects of the human capacity to conceive. These terms can be confusing, especially because they are not used in consistent ways. Despite the importance of reproduction to individuals and to society, there is no accurate way to assess this capacity at the ...openaire +1 more source
Animal Reproduction Science, 2004
Since 1980 there has been increasing interest in the identification and utilisation of major genes for prolificacy in sheep. Mutations that increase ovulation rate have been discovered in the BMPR-1B, BMP15 and GDF9 genes, and others are known to exist from the expressed inheritance patterns although the mutations have not yet been located. In the case
openaire +2 more sources
Since 1980 there has been increasing interest in the identification and utilisation of major genes for prolificacy in sheep. Mutations that increase ovulation rate have been discovered in the BMPR-1B, BMP15 and GDF9 genes, and others are known to exist from the expressed inheritance patterns although the mutations have not yet been located. In the case
openaire +2 more sources
The decline of fecundity with age
Maturitas, 1988PIP: Historical studies all indicate a decline in fertility with age. The artificial insemination data from a program carried out in France since 1973 related to women whose husbands were permanently sterile because of azoospermia. During the first 2 cycles only 1 insemination was performed per cycle using frozen semen from married donors aged 45 years
openaire +2 more sources
Fecundity selection theory: concepts and evidence
Biological Reviews, 2017Daniel Pincheira-Donoso
exaly