The chromosomes of the giant forest hog, Hylochoerus meinertzhageni, the warthog, Phacochoerus aethiopicus and the bush pig, Potamochoerus porcus an studied. Their sex-and nucleolar chromosomes are compared mutually and with those of the domestic pig, Sus scrofa. AU four species have similar X and Y chromosomes. The only bush pig sow examined, however, exhibits an extraordinary situation with two very different X chromosomes. One of these X's, which is of the ordinary type, is present in the boars together with a Y.
The chromosomes and the anatomy and histology of the reproductive tract of two intersexual pigs were investigated. The animals displayed mosaicism in the leucocyte population with an XX : XY ratio of 1 : 3 and 2 : 1, respectively. Anatomically the former animal most probably was a male hermaphrodite; the latter a true hermaphrodite. In non-hemopoietic tissue, i.e. fibroblasts from kidney, lung and spleen, all cells had a chromosome set with two X-chromosomes. The possibilities that the two investigated pig intersexes were freemartins are discussed.
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