EVALUATION OF THE EFFECTS OF ENZOOTIC PNEUMONIA IN PIGS ON WEIGHT-GAIN AND DAYS TO SLAUGHTER UNDER NEW-ZEALAND CONDITIONS

The effects of enzootic pneumonia on average daily weight gain and num ber of days taken to reach slaughter weight was studied in 333 bacon-w eight pigs. Each 1% of lung volume affected by enzootic pneumonia was shown to reduce average daily gain by 2.2 grams and increase the numbe rs of days to slaughter by 0.61 days. The cost of these reductions in performance was calculated to be about NZ$1 for each 1% of lung affect ed.