252 



SWJNE PRACTICE 



tion may gain access to the parasites. Some old chronic cases do not 

 respond readily, if at all, to treatment because of the thick, wrinkled 

 skin which protects the parasite. 



Fig. 60. Advanced hog mange showing pedicle-like scabs. 

 Bull. 1085, Dept. Agrl.) 



( Farmers' 



Demodectic Mange 



Demodectic or red mange is not so prevalent in swine in America 

 as is sarcoptic mange. Red mange rarely occurs enzootically. 



The cause of red mange is the Demodex foUiculorum, var. suis. 



