The Simmental breed is a breed of dual-purpose cattle suitable for both milk and meat production. It is the most populous breed of cattle in Slovenia. Breeding program for Simmental breed include monitoring of milk and meat production – this is very important when we select bull dams. The rearing and selection of Simmental breeding bulls, using for insemination or natural matting, is an important part of the breeding program. The breeding bulls are the result of planned insemination of the bull dams with sire bulls. Sire bulls usually originate from foreign populations of Simmental breeding bulls, however, sometimes also from domestic populations of positive proof bulls. In the B. Sc. thesis, we describe selection scheme of Simmental breed and present in detail the life cycle of a positive proof bull. Likewise, we present the criteria for selecting of Simmental bull dams, selection criteria for Simmental Sire bulls and present the bulls used for the insemination of Simmental cattle in the last seven years. The number of Simmental bull dams in last seven years has been fluctuating, whereas their milk yield production is increasing in these years. The highest number of bull dams in last seven years were selected in 2011, while the least in 2014. The average milk yield of Simmental bull dams has increased for 1,000 kg from 2010 to 2016. The largest number of Sire bulls for insemination of bull dams was in 2015, where there were 14 Sire bulls available for insemination. Whereas this year there are also four genomic tested bulls available for insemination of Simmental bull dams.