CHAPTER VL 



DISEASES OF THE LEGS AND FEET. 



A. Those caused by parasites. 



MANGE OF THE LEGS AND FEET. 



Marge of the legs, or chalk legs, is a contagious dis 

 ease caused by a parasite known as Sarcoptes mutans. 

 It it confined exclusively to the legs and feet and never 

 extends to other parts of the body. 

 When the parasites of this disease 

 are placed on the legs of a healthy 

 fowl they work their way under the 

 large scales on the front of the leg or 

 on the upper part of the toes. They 

 multiply rapidly and within a short 

 time it may be noticed that the scale 

 commences to rise and a little yellow- 

 ish crust forms about its edge. In 

 time, other scales become involved, 

 the crust increases in thickness and 

 scurfy, powdery material piles up in 

 considerable quantity until in old andFeet 

 cases the entire feet and legs may be J:inm%meBnH^rH\ 

 involved and to such an extent that ^"^'■• 

 they seem to be several times their normal thickness. 

 When this Uiick crust is pulled off it is found that tlic 

 surface is I'iiw ;ind ttlccding. The interior of the crust 



(83) 

 5'--T 



The Parasite of 

 Mange of the Legs 



