ROBERTSONIAN FUSION IN A SIMMENTAL COW-BULL MOTHER .2.

The aim of this work is to present one of the curent problems which fr equently accompanies high production in modern cattle management. It i s the apperance of Robertsonian translocations in the cattle karyotype . Cytogenetical examination was performed on a 4 year old Simmental co w which was phenotypically normal and had normal fertility and high mi lk production. On the basis of these characteristics this cow had been chosen as a bull mother. However, all of its three pregnancies ended by the birth of an avital calf. They died 30 minutes after birts. This was the reason for a karyotypic analysis of the problematic cow. A he terologous Robertsonian fusion of two acrocentric autosomes was found. The conclusion is that the Simmental Cow which attracted our attentio n was a carrier of balanced karyotypic changes that could be transmitt ed to the offspring and eventually spread all over the population.