The chromosomes of the transmissible venereal tumour of dogs in Ibadan, Nigeria.

Cytogenetic studies on 11 transmissible venereal tumours in seven dogs in Ibadan, Nigeria, are reported. The number and the morphology of the chromosomes, as shown by the metaphase cells, revealed that the tumour cells have similar cytogenetic features to those reported in other parts of the world. The suggestion of common sources of infection for the animals in the different geographical locations of the world was supported.