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The bachelor thesis deals with nutrition of dairy cattle with consequent influence on reproduction. It is focused on feeding by poor quality feeds and feed doses that negatively affect fertility. In the first part, it deals with biological bases of reproduction and especially with fertility, which is the most valuable property in cattle breeding. The second part deals with nutrition of dairy cattle. It contains a description of vital nutrients and their effect on fertility. Attention is paid to antinutritional agents and their effects on reproduction. Furthermore, the thesis deals with assembling feed doses according to the phase nutrition. This is where attention is paid to the feeding of breeding bulls. The last part of the bachelor thesis is focused on the most frequent causes of culling of dairy cows. Attention is mainly focused on nutrition and reproduction