In the thesis, we examined the differences in the growth of bulls and heifers of the nine breeds most represented in Slovenia between the years 2005 and 2023. The study included the Simmental, Brown Swiss, Holstein, Cika, Charolais, Limousin, Angus, Highland and Galloway breeds. Within each breed, we analyzed two categories - young bulls (category A) and heifers (category E). Slaughtered animal data were obtained from the Identification, Registration and Information Systems Division (SIRIS) and growth was estimated based on net daily gain. In the young bull category (A), the Charolais breed achieved the best results with the highest average daily net gain (629.62 g/day) and the highest carcass weight (383.71 kg). In addition, Charolais bulls had very good carcass conformation (10.05) and fatness (6.46), followed by Limousin, Angus and Simmental bulls, while Brown Swiss, Holstein and Galloway bulls scored slightly lower. The worst results were achieved by the Highland bulls, which only achieved 40 % of the growth of the Charolais bulls. Similar differences between the breeds were also observed in the heifers, with Charolais heifers achieving the best results, while Highland heifers achieved the worst results.
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