L.YMPHANGITIS AND HEAVES. 167 



Icnown as roaring or whistling, the respiratory movements of 

 flank and chest being normal in character. 



Prevention. — Feed reasonable quantities of good wild hay or 

 tame hay cut early. Avoid dusty foods. The amount of hay 

 should be restricted and if necessary more grain may be used. 

 Horses that are greedy feeders should be bedded with sawdust or 

 shavings, or protected by muzzle. 



Postmortem. — On examination postmortem the lungs are 

 found to be rather bloated and to contain more air than is normal. 

 The chambers in the right side of the heart are somewhat en- 

 larged and the walls thickened. 



Treatment. — Avoid over-ripe hay. Avoid much bulky food 

 of any kind. If hay or grain is at all dusty sprinkle. Use 

 horses affected with heaves for slow work. Medical treatment is 

 considered to be unsatisfactory. 



