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Pygopagus Parasitic Bovine Twins Involving the Udder^*

From the Department of Dairy Husbandry, University of Missouri, Columbia

ABSTRACT

The frequency of twinning in cattle is rather low. Johansson (1932) in a recent survey of the literature, observed a frequency of 1.88 per cent in dairy cattle in a tabulation of 243,016 births and only 0.44 per cent in beef cattle in a tabulation of 748,855 births. Still more rare is the appearance of double monsters or conjoined twins. Johansson presented a figure of such twins preserved in the museum of the New York State Veterinary College which were joined posteriorly of the region of the diaphragm. The anterior and free parts displayed a pronounced reversal of symmetry in color patterns. He also reported that Krönig (1924) had described 10 cases of two headed calves and one case of "Siamese" cattle twins.

A very rare anomaly of twinning is the presence of one member which is completely represented and normal and the other, called the parasite, which is smaller in size and more or less imperfectly developed.

^* Contribution from the Department of Dairy Husbandry, Missouri Agricultural Experiment Station. Journal Series No. 410.