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Journal of Experimental Biology 2,247-263 (1925)
Published by Company of Biologists 1925

On Sex-Intergrade Pigs: Their Anatomy, Genetics, and Developmental Physiology

JOHN R. BAKER 1

1 Department of Zoology and Comparative Anatomy, Oxford; Christopher Welch Scholar in Biology.

Sex-intergrade pigs show all variations between complete and abortive development of the derivatives of the Müllerian and Wolffian ducts. The external genitalia are, however, always essentially female in type. The seminiferous tubules are degenerate even when the testes are descended. In the two true hermaphrodites described the ovary is on the left and the ovo-testis is on the right; and in each case the ovarian part of the ovo-testis is anterior. It is not improbable that all sex-intergrades were true hermaphrodites in embryonic or early post-natal stages. A tendency to sexual abnormality in pigs is inherited. The ratio of normals to sex-intergrades among the offspring of intergrade-producing parents is 8:1 or >8:1.

The abnormality does not appear to be associated with abnormality of any other ductless gland.

Sex-intergrades often have male sexual instincts.






© The Company of Biologists Ltd 1925