abstract:A freemartin or free-martin (sometimes martin heifer) is an infertile female mammal which has masculinized behavior and non-functioning ovaries. Genetically the animal is chimeric: karyotyping of a sample of cells shows XX/XY chromosomes.
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the female of a pair of twin calves of unlike sex that is imperfectly developed and sterile, probably due to the influence of the male hormones of its twin during development in the uterus (与公牛孪生的)无生殖机能的小母牛