290 The Diseases of Animals 
This trouble may follow a local injury to the throat. 
It is frequentiy a sequel to distemper. It is also fre- 
quently seen among race- horses and others that are 
subjected to severe work that taxes the respiratory 
powers. It is often hereditary. Some stallions habit- 
ually transmit this weakness to their colts. Horses 
with Jong slender necks seem to be predisposed to this 
disease. 
The disease comes on gradually; there is a slight 
roaring or whistling sound, made when the air is taken 
in (inspired). As the disease progresses, the breathing 
becomes more difficult and the sounds louder. The 
sounds are most distinct when the horse is exercised 
violently. In severe cases, a horse can travel rapidly 
only a short distance without “choking down.” 
Roaring derives little benefit from treatment. In 
the early stages, repeated light blisters, applied to the 
larynx, may be beneficial. In case of valuable animals, 
an expert surgeon can operate upon the larynx in such 
a manner as to permanently cure a large majority of 
the cases. <A tracheotomy tube can be inserted in the 
windpipe of a horse-used for speed, though it is a tem- 
porary measure. It cannot be used permanently, on 
account of the irritation it causes. 
Roaring is sometimes called “broken-wind,” but it. 
must not be confounded with heaves, to which that 
name is also applied. 
