Due to increasingly intensive milk production, dairy cow breeders face an increasing risk of disease. To increase animal resistance and fertility, preventive measures and proper management of milk production with proper evaluation of milk recording results are important and keeping records of reproductive events in the herd is helpful. In 2020, we found that the most common reasons for culling dairy cows were fertility problems (31%), followed by hoof and leg diseases (13.7%), mastitis (7.5%), and increased somatic cell count (5.2%). In the second part of the paper, we analysed milk recording data on milk yield and fertility of dairy cows on Sinjur farm for the period from 2010 to 2021. The number of dairy cows varied from 17 to 21 during this period, and the average milk yield in 305 days varied from 6,189 kg of milk in 2021 to 4,003 kg of milk in 2011. The calving interval varied on average from 392 days in 2010 to 533 days in 2021. The most common reasons for cows leaving the herd on the Sinjur farm were fertility problems, hoof diseases, hoof and leg injuries, and udder diseases. The largest proportion of cows culled due to fertility problems was in 2011 and 2021, and due to hoof diseases and hoof and leg injuries in 2018 and 2021.
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