DISEASES OF FARM ANIMALS 



241 



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 caUle for 

 treatment of mange. The dipping tank is now generaUy usea 

 throughout the West. 



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 



