On dairy farms, ensuring the well-being and proper health of dairy cows is crucial for successful milk production. Due to large daily fluctuations in temperature and humidity and rapid weather changes, it is difficult to provide animals with a suitable microclimate in the barn. In addition to weather factors, big problem for dairy cows are old and overcrowded stables. Therefore, animals in such conditions are even more exposed to the unfavourable microclimate of the barn and the occurrence of heat stress in summer, which results in lower milk yield, poorer milk content, much poorer conception at insemination, poorer animal welfare and health. All this leads to economic losses on the farm. As part of the international FreeWalk project, we monitored air temperature, relative humidity and air flow rate, and the temperature humidity index (THI) at 9 places in the barn of dairy cows at the farm Zore in the period from 2018 to 2020. In addition to the mentioned measurements, temperature and humidity were recorded in the barn with a data logger with half-hour intervals. Using the results of milk recording, we monitored the milk yield and milk content of dairy cows in relation to the microclimate parameters of the barn. We found that when the THI value is above 72, the fat and protein content in milk decreases.
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