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Freemartinism is one of the most severe forms of sexual abnormality among cattle. It causes infertility in the female calf born with a male twin.reemartinism is one of the most severe forms of sexual abnormality among cattle. It causes infertility in the female calf born with a male twin.
In some cases, there are no symptoms of freemartinism because the male twin may have been aborted at an earlier stage of gestation. Estimates of the percentage of natural beef cattle births that produce twins vary. One estimate (Gilmore) puts the percentage at about .5% or 1 in every 200 births.Approximately one-half of the sets of twins should contain both a bull and a heifer calf.n some cases, there are no symptoms of freemartinism because the male twin may have been aborted at an earlier stage of gestation. Estimates of the percentage of natural beef cattle births that produce twins vary. One estimate (Gilmore) puts the percentage at about .5% or 1 in every 200 births.