DISEASES OF THE HOG. 103 



gree and character. The iuliammation very fre- 

 quently begins at the nostrils, fauces or larynx and 

 passes down the trachea into the bronchial 

 tubes. 



Causes: Cold in some form is the usual cause 

 and is most common in the fall. Young pigs which 

 have to lie out at nights exposed to cold rains or 

 those kept in cold, w^et houses are very apt to take 

 inflammation of some part of the respiratory pas- 

 sages. Pigs should have a good, dry, warm place to 

 sleep in at night. It is said that an excess of ozone 

 in the atmosphere may occasionally cause it as well 

 as coryza and laryngitis; this may be true as we 

 sometimes find a number of animals affected w4th 

 bronchitis at the same time. 



Symptoms: There is a cough and usually some 

 hoarseness with distressed breathing; the animal is 

 restless, holding up its head as if it was suffering 

 snuffing the air; there is fever indicated by dryness 

 of the skin and fast pulse; the cough is at first dry 

 and painful; as the disease advances the cough be- 

 cojDies softer and after severe coughing there will 

 be more or less mucus of a white frothy color com- 

 ing from the mouth; the appetite is impaired ac- 

 cording to the severity of the fever. The disease 

 generally lasts from four to ten days; at that time 

 if the appetite is improving, the skin becoming 

 moist and the cough less frequent, the animal 

 makes a rapid recovery. In bad cases the inflam- 

 mation sinks deeper into the small bronchial bron- 

 chi; the air enters with difficulty through the con- 

 stricted tubes, causing great oppression and diffi- 



