Many calf housing options exist, but important system fundamentals need to be incorporated into the design related to ventilation, calf comfort, labor efficiency, cost effectiveness, and group versus individual housing strategies, for the system to be successful. Let's talk ventilation. Calf barns have many sources of contamination: moisture, dust, pathogens, heat, and noxious gases. The goal is to provide fresh air at a sufficient velocity to mix and remove these contaminates without causing a draft on the calves, as well as at a volume such that the exiting air is only slightly stale.