NON-COMMUNICABLE DISEASES 237 



from heaves when taken to an arid country, where the disease is 

 unknown in native horses, become serviceable and seldom are 

 troubled thereafter. By reducing the roughage to a minimum 

 and increasing the concentrates accordingly it is possible to make a 

 badly affected animal serviceable. 



To relieve heaves nothing has been found so beneficial as 

 arsenic. It is used in the form of Fowler's solution. The remedy 

 may be given in 1-ounce doses three times a day. When com- 

 bined with the daily administration of Carlsbad salts, and con- 

 tinued over a long period, this treatment affords remarkable relief. 



ROARING 



Roaring is a disease of the air-passages in which a noise resem- 

 bling a whistle or roar is produced at each forced inspiration, i. e., 

 following a brisk trot or heavy work. The fact that it is hereditary 

 has led to the disqualification of afflicted stallions for public service 

 in many states. In the usual form there is found a paralysis and 

 wasting away of one of the groups of muscles which move a part 

 of the larynx. Little hope can be entertained for spontaneous 

 recovery. Within recent years an operation has been perfected 

 which reheves about 70 per cent, of the horses operated upon when 

 it is properly performed. 



LYMPHANGITIS 



"Monday morning disease" and "big leg" are other names for 

 this disease. It is characterized by a suddenly appearing pro- 

 nounced swelhng and lameness in one hind leg. The lymphatics 

 appear to be the structures affected. 



There is some difference in opinion as to the cause. When an 

 abrasion can be found in the skin through which infection has had 

 an opportunity to enter, it is reasonable to attribute the disease to 

 bacterial invasion. At other times unwonted idleness on full feed 

 seems to be the determining cause. Heavy horses are predisposed 

 to IjTxiphangitis. 



Symptoms. — The swelling progresses rapidly and soon extends 

 around the leg. Pain is present and shown by the patient holding 

 the leg in a position to get most rehef . When the inguinal lymph- 

 glands are palpated great sensitiveness is exhibited. Pressure 

 with the finger-tips leaves well-marked pits. Fever as high as 

 105° or 106° F., with its usual accompaniments, is present. 



