Thyroid Function of Mono- and Dizygous Cattle Twins

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Abstract
Several indices of thyroid function were evaluated at various times of the year in 3 sets of cattle twins, of which 2 were classified as monozygous and 1 as dizygous on a phenotypic basis. The phenotypic diagnosis of monozygous twins based on morphological characters agreed well with the diagnosis by the determination of thyroid function. Similar observations were recorded when the twins were under different hormonal therapy. It is suggested that determination of thyroid function during the winter months (cold environment) might greatly facilitate an objective diagnosis of monozygocity.