DISEASES OF FARM ANIMALS 24I 



SCAB IN CATTLE.— Scab or itch, sometimes 

 called mange of cattle, is caused by a minute mite 

 that lives upon the surface of the skin, burrowing 

 into it. Other animals are not attacked by this 

 parasite, although a similar one does afflict sheep. 

 So long as cattle are doing well on grass, no dis- 

 turbance is noticed. As soon, however, as they 



A CATTLE BATH TUB 



The tank here shown is used for dipping the cattle for 

 treatment of mange. The dipping tank is now generally used 

 throughout the W^est. 



are placed on dry food and cold weather sets in, 

 the disease appears, and, if the cattle do poorly, 

 develops into a very aggravating form. Old 

 cattle are less troubled, the attacks being more 

 frequently on calves and yearlings and two-year- 

 olds out of condition. In the early stages the itch- 

 ing of the skin in the region of the neck or shoul- 

 ders is first noticed. This is indicated by the 



