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Journal of Dairy Science Vol. 42 No. 8 1346-1350
© 1959 by American Dairy Science Association ®
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Thyroid Function of Mono- and Dizygous Cattle Twins1

B. N. Premachandra, G. W. Pipes and C. W. Turner2

Department of Dairy Husbandry, University of Missouri, Columbia

ABSTRACT

Several indices of thyroid function were evaluated at various times of the year in three sets of cattle twins, of which two were classified as monozygous and one 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.

FOOTNOTES

1 Contribution from the Missouri Agricultural Experiment Station. Journal Series No. 1983. Approved by the Director.

2 Aided in part by a grant from the U. S. Atomic Energy Commission, Contract No. AT(11-1)-301.






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Copyright © 1959 by the American Dairy Science Association ®.