Animal hygienic assessment of air carbon dioxide concentration in semi-open freestall barns for dairy cows
Keywords:
carbon dioxide, dairy cows, freestall housing, welfareAbstract
The objective of this study was to determine the CO 2 concentration in the different animal service zones in semi-open freestall barns for dairy cows. The study was conducted in 3 dairy cattle farms, with production buildings with different capacities – two farms for 120 and one farm for 500 cows. The following microclimate parameters were monitored: temperature (°C), relative humidity (RH, %), temperature-humidity index (THI) and speed of airflow (SAF). The average CO2 values in the three buildings surveyed ranged from 434.85 to 635.27 ppm, with a maximum deviation up to 2130 ppm. The highest CO2 concentrations were recorded in the building with the largest capacity – 500 cows. In the building with a capacity of 120 cows, a trend for the lowest CO 2 levels and the least variation during the day was reported. In the summer the lowest CO 2 values in the air above the stalls – 515.9 ppm were reported and in the winter the highest – 626.2 ppm. Highest CO2 values in the morning and afternoon were recorded in all investigated barns when the animal’s locomotor activity was greatest associated with eating, drinking, and moving (other activities). The correlation between the temperature-humidity index (THI) values and the CO 2 values was significant and negative (-0.23). The lowest CO 2 concentrations were reported at THI values 68-72.
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