Minimum carbon dioxide is a key predictor of the respiratory health of pigs in climate-controlled housing systems.

The differences in all the environmental parameters were highly significant ( p < 0.001) with increasing temperature (22.78 vs 28.44 °C), humidity (61.86 vs 87.27%), CO 2 (847.91 vs 2,739.93 ppm), NH 3 (8.18 vs 20.53 ppm), and H 2 S (6.70 vs 14.28 ppm) in the TRT group.

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There was an increasing trend in NH 3 levels in both groups.

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