Abstract
Samples were collected from 7 sites of each lung in pigs fed a powdered ration or a mixture of powdered and regular rations and pigs showing retarded growth and examined histologically. The foreign body found in lesions of aspiration pneumonia consisted mostly of starch. It included hairy substance and plant tissue. These lesions were most frequently found in the pigs showing retarded growth. There was no difference in the frequency of occurrence of these lesions between the pigs fed a powdered ration and those fed a mixture of powdered and regular rations. In conclusion, the powdered ration showed no positive tendency to induce aspiration pneumonia.
