Abstract
I examined the sex ratio of litters of mule deer ( Odocoileus hemionus ) collected during late winter in 1984–1989 in eastern California. Although the overall sex ratio was unity, heavier mothers, and those with higher kidney-fat indexes, tended to produce male-biased litters. Results conformed to predictions from theory that relates maternal-investment ability to adaptive variation in sex ratios of offspring in polygynous animals.
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