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European Journal of Wildlife Research. June , Cite as. There is ongoing interest to assess what factors affect offspring sex ratio, especially in ungulates. Wildlife managers might be interested in influencing this sex ratio for two reasons: either in order to limit population growth more effectively by reducing the proportion of females born or to increase revenues by a higher proportion of trophy bearing males in the population. While previous studies mostly focused on how maternal traits affect offspring sex ratio, we included here also male traits in our analysis. We focused our analyses on parameters that can be easily assessed by managers on the population and individual level, i.
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Freemartinism is recognized as one of the most severe forms of sexual abnormality among cattle. This condition causes infertility in the female calves born twin to a male. When a heifer twin shares the uterus with a bull fetus, they also share the placental membranes connecting the fetuses with the dam.
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A freemartin or free-martin sometimes martin heifer is an infertile female mammal with masculinized behavior and non-functioning ovaries. The animal originates as a female XX , but acquires the male XY component in utero by exchange of some cellular material from a male twin, via vascular connections between placentas: an example of microchimerism. Freemartins are known to have been described by the Roman writer Varro , who called them "taura".
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