196 SOUTHERN PORK PRODUCTION 



Sun scald. — A disease similar to the above occurs to 

 some extent in the South known as sun scald. About the 

 only difference between sun scald and pitch mange or 

 eczema is in the cause. White hogs seem much predisposed 

 to the disease. The symptoms are about the same as 

 given for eczema except that parts exposed to the sun 

 are more often affected. Shade and general good care 

 in sanitation and disinfection are the main precautions 

 necessary to successfully control the trouble. 



Parasitic diseases of swine. — In addition to those dis- 

 eases of swine caused by bacteria and morphological con- 

 ditions, we have those caused by worms and lice. Fully 

 90 per cent of losses in swine are associated with 

 parasitic infection. Roughly, the parasitic diseases of 

 swine may be classified into those caused by worms and 

 those caused by lice and mites. 



Worms. — Among the diseases of swine caused by 

 worms those affecting the alimentary tract are more 

 numerous and important. The large thorn-head worms 

 are found wherever the secondary host, May beetles, are 

 found. The males are from 2 to 4 inches in length, and 

 the females may attain a length of 12 inches. As a rule 

 the worm is round, and the anterior end bears a number 

 of recurved booklets, to serve as an attachment to the 

 wall of the intestines. The attachment may give rise to 

 irritation and possible rupture, resulting in peritonitis 

 and death. 



Another very important worm affecting the alimentary 

 tract is the large, round worm, known as Ascaris Snis. 

 The females often attain a length of 12 inches. The worm 

 is white, tapering off to a point at each end, segmented, 



