SECTION XVI. 



NON-PARASITIC DISEASES 

 OF THE SKIN. 



Only after the most careful examination should 

 a diagnosis of non-parasitic disease of the skin be 

 made, and then it is the best policy to keep a close 

 watch on the affected animals and to isolate them 

 from the apparently healthy ones. 



1. Non-Parasitic Itch. 



This condition is so rare in sheep as to merely 

 merit the mention that it may and does occur, the 

 exciting causes being rich food, lack of exercise 

 or crowding. 



The treatment is removal of the exciting cause. 



2. Alopecia. 



Falling out of the wool; baldness. 



This is frequently seen on the range, and to the 

 inexperienced, looks like scab. Ewes that have 

 lost their lambs and have had severe attacks of 

 mammitis or "blue bag" are the common victims. 

 Sometimes lack of food and exposure are the con- 

 tributing factors. 



No treatment has been found successful, except 

 to let it alone, and in case of old ewes, prepare 

 them for market. 



