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Cytogenetic study of intersex swine

 

 

Antonio Junqueira TambascoI; Iris FerrariII; Isabel Regina ScheidIII; Nelson MoresIII; José Eduardo LausIV

IEMBRAPA-UEPAE de São Carlos, Caixa Postal 339, 13560 São Carlos, SP, Brasil. Send correspondence to A.J.T.
IIUniversidade de Brasília, Campus Universitário, 70910 Brasília, DF, Brasil
IIIEMBRAPA-CNPSA, Caixa Postal d-3, 89700 Concordia, SC, Brasil
IVFaculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14049 Ribeirão Preto, SP, Brasil

 

 

ABSTRACT

To clarify the etiology of intersexuality due to genetic factors, 33 intersex swine and 33 of their ascendants were studied karyotypically. Metaphases were obtained from peripheral blood lymphocytes and analyzed by chromosome G and C banding in addition to standard Giemsa staining. Two cases of chromosome anomalies were observed: an intersex presenting 38,XX/38,XY mosaicism or chimerism, and an intersex presenting a break in one chromosome of pair 9, with a karyotype identical to that of the remaining intersex animals, i.e., 38,XX. All parents had normal karyotypes, i.e., 38,XX for females and 38,XX for males. Macro- and microscopic examinations of the genitalia of 26 of the 33 intersex animals revealed that 10 were true hermaphrodites, 14 were male pseudohermaphrodites and two were morphologically normal females except for a slightly hypertrophied clitoris and a "parrot beak"-shaped vulva.

Keywords: Cytogenetic; Intersex swine.

 

 

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