As expected,pigs in the control group had the highest average daily weight gain; 0.768 0.070 kg. The lowest average daily weight gain was 0.602 0.128 kg and occurred for Beaufortchallenged pigs. This was unexpected given Hillcrestchallenged pigs, which had more severe clinical respiratory disease, gained an average 0.735 0.154 kg a day, but a secondary infection in one of the Beaufort challenged pigs
possibly skewed average daily weight gain in this group (data not shown).