Fig. 5. The inactivation rates (decrease of oocyst viability) during four sampling seasons on each farm. Farms A103 (a) and C304 (b) utilize solar calf housing and Farms A105 (c) and B205 (d) raise calves in conventional housing. Mean inactivation of chamber oocysts indicated by solid lines and control oocysts by dashed lines, and the individual points are the actual percent viabilities used to determine mean inactivation. Hourly bedding temperature is represented by the dotted line and corresponds to the secondary y axis (right side). Data are unavailable for chamber oocysts in the fourth season on Farm B205.