PMID: 10155Oct 1, 1976

An equine cryptorchid with testicular and ovarian tissues

Equine Veterinary Journal
C W McIlwraithParvathi K Basrur


Cytogenetic and histological studies were carried out on an intersex horse which was diagnosed clinically as a cryptorchid. Surgery confirmed the horse to be a bilateral abdominal cryptorchid and histological examination revealed ovarian tissue associated with the left epididymis. Chromosome analysis of cultured cells from testicular tissue, ovarian tissue and skin revealed 64-XX and 64-XY make-up, the left gonad containing a greater preponderance of XX cells over XY cells. The external characteristics and behaviour of the horse were indistinguishable from that of a "routine" cryptorchid. Other cases of equine intersexes are reviewed and theories for the discrepancies between genetic, gonadal and phenotypic sex are discussed.


Jul 1, 1972·Equine Veterinary Journal·R BoutersA De Moor
Oct 1, 1970·The British Veterinary Journal·N GluhovschiM Bratu
Jan 1, 1967·Cytogenetics·R A McFeelyJ D Biggers
Jan 1, 1964·Cytogenetics·Parvathi K Basrur, R I COUBROUGH
Nov 1, 1946·Proceedings of the Society for Experimental Biology and Medicine·L J WELLS


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Unilateral Cryptorchidism
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