Maternal longevity and offspring sex in wild ungulates
نویسندگان
چکیده
منابع مشابه
Maternal condition and previous reproduction interact to affect offspring sex in a wild mammal.
Trivers and Willard proposed that offspring sex ratio should vary with maternal condition when condition, meant as maternal capacity to care, has different fitness consequences for sons and daughters. In polygynous and dimorphic species, mothers in good condition should preferentially produce sons, whereas mothers in poor condition should produce more daughters. Despite its logical appeal, supp...
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Three years ago Shearer, Davidson and Finch made the startling discovery that women who became schizophrenic within one month of conception gave birth to female infants only. This alteration of secondary sex ratio was statistically significant at the .001 level. In a later study, Taylor supported Shearer's findings; his data, too, were significant at the .001 level. In addition to confirming Sh...
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Background Although there are different ways to achieve the desired sex of the fetus, most of those are not completely effective. This paper reports a study on human to check the theories which hypothesize that high potassium maternal diet, douching with alkaline substance to change vaginal PH and intercourse around ovulation affects the sex ratio of the progeny MaterialsAndMethods A quasi-expe...
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ژورنال
عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences
سال: 2019
ISSN: 0962-8452,1471-2954
DOI: 10.1098/rspb.2018.1968