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The diploma thesis is focused on the impact of the age of first calving on the milk efficiency of the Czech Fleckvieh - Simmental cattle in a specific agricultural enterprise. The theoretical part describes the characteristics of the Czech cattle, goes deeper into fertility, cows’ reproduction, milk efficiency and its influential effects. In the practical part was depicted a company in Vysočina region where the results of this thesis were evaluated. The data were based on and gathered from the examined enterprise’s January 2017-July 2020 milk recoding. According to the results, it was obvious that the age of first calving does indeed have an statistically significant effect on the dairy cattle’s milk efficiency. It has been concluded that the cows calved in the age of 24 months and younger reached statistically significant (p |