CIRCULATORY ORGANS 



25.1 



Tick Infestation 



Infestation of swine with ticlvs, particularly the ear ticks (Ornitho- 

 dorus megnini), has attracted the attention of some southern swine 

 breeders. These ticks locate in the external ear and produce irritation 

 which annoys the infested animals. They may be removed by pouring 

 into the ear some alcohol, dilute antiseptic or bland oil. 





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Fig. 63. Hog wallow of concrete. (Farmers' Bull. 1085, Dept. Agrl.) 



Thread Worm Infestation 



Cutaneous infestation by Filaria may occur in swine, but it has not 

 been positively identified. 



Bingivorm Infestation 



Rarely does ringworm occur in swine. The condition is caused by 

 a Trichophyton. 



Lesions. — The lesions are usually located on the back or the outer 

 surface of the thighs and are seen as isolated, circumscribed, round, 

 red spots with a raised margin which bears small vesicles. The central 

 portion appears normal, except that it is scaly. The trouble gradually 



