Intersexuality in the Animal Kingdom pp 392-406 | Cite as
The Prenatal Development of Bovine Freemartins
Abstract
Freemartins in cattle have long been a classical example of naturally occurring intersexuality in a common animal species. The beautiful studies of Frank Lillie (1916, 1917, 1923) and of his pupils (Chapin, 1917; Willier, 1921; Bissonnette, 1924, 1926) and those of Keller and Tandler (1916) are well known. The freemartin condition inspired theories of sex differentiation and many brilliant experiments in amphibians and other vertebrates. It suffices to recall that a freemartin is a genetic female calf born as a twin to a bull calf, and afflicted with more or less severe abnormalities of the internal reproductive organs. The prerequisite for the appearance of these anomalies is that the chorionic blood vessels of the male and female twins are fused and permit exchange of blood. According to Lillie this also permits transfer of testicular hormone into the female fetus. In the postnatal condition, the freemartin gonads seldom display any ovarian characteristics (Chapin, 1917; Rajakoski and Hafez, 1963); they may be extremely reduced (“asexual type” of Witschi, 1939) or contain sterile cords very similar to testicular seminiferous cords; clusters of interstitial cells may be recognized (e.g. Willier, 1921; Bissonnette, 1926; Short et al., 1969). Release of testosterone into the gonadal vein has been established in one especially strongly masculinized adult freemartin (Short et al., 1969).
Keywords
Seminal Vesicle Genital Tract Interstitial Cell Normal Female Female FetusPreview
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