This results in a dry manure pack. Lower relative humidity levels increase the risk of respiratory infections and higher levels increase ammonia levels in the building. During very cold periods you may elect to let relative humidity levels rise as high as 80 percent by reducing ventilation levels in an effort to reduce heating costs with an increase in odor levels. Ammonia is the most common odor produced in a rabbit facility. For worker comfort it is important that the ammonia level be kept below 10 ppm.
Higher levels are uncomfortable.
Occupational Safety recommendations are that ammonia levels not be higher than 25 ppm if workers are exposed for more than eight hours per day. About 5 ppm is the lowest detectable level. High levels of ammonia will affect rabbit production as it causes respiratory irritation that leads to snuffles. Ventilation to control moisture and ammonia will usually be sufficient to control other gases such as carbon dioxide and hydrogen sulfide. Ammonia levels are sometimes used to indicate whether adequate ventilation is being provided.