Abstract
Karyotype constitution of three breeds of Bos taurus taurus (Charolais, Chianina and Jersey), three breeds of Bos taurus indicus (Gyr, Guzerat and Red Shindi) and four ones coming from the Bos taurus taurus Bos taurus indicus crosses, were studied and on the basis of this preliminary data there will be a possibility of distinguishing some breeds of Bos taurus taurus through the Y chromosome.