Chromosome investigation of Danish A. I. beef bulls

In 1973 all Danish A.I. beef bulls were tested by chromosome analysis, in order to eliminate bulls with Robertsonian translocation (centric fusion translocations). From abroad it has been reported that this aberration reduced fertility. Of 65 bulls none was affected. The literature concerning chromosome investigation of populations of A.I. bulls are summarized. It is proposed that all imported bulls should be tested by chromosome banding methods, before the bulls are used.