124 SWINE DISEASES 



measures not only fail to effect the removal of more than 

 a small percentage of the larvae, but they also irritate 

 the highly sensitive tissues and greatly aggravate the 

 condition. 



None of the ordinary fly-repellants has any deterrent 

 effect upon the female of the screw- worm fly in the 

 presence of fresh blood, either in recent wounds or in the 

 discharge from screw-worm infested wounds. However, 

 a mixture composed of turpentine one dram, phenol one 

 dram and cottonseed oil four ounces is an effective re- 

 pellent for this fly, and where there is a probability of 

 screw-worm infestation it should be applied to fresh 

 wounds and to infested wounds as long as the screw- 

 worm larvse are present and the sanguinous discharge 

 continues. One application daily is sufficient. 



Scrotal Hernia 



This form of hernia occurs in the male. It consists 

 of a protrusion of omentum or intestine through the 

 inguinal canal and into the scrota! sac. 



Scrotal hernia may be limited or extensive; in some 

 instances the scrotum may be as large as a gallon jug. 

 Raising the hind parts of the pig usually permits of a 

 portion of the protruded structure passing back into the 

 abdomen, and thus reduces the hernia. 



This condition is relieved only by operation in which 

 castration is required if it has not been done previously. 

 The covered operation is performed, and the vaginal 

 tunic is supported by sutures. 



PENIS 



Malformations of the penis are rare. One case has 

 been observed of a double penis, the organ being double 

 from the ischial arch. Each penis contained a normal 

 urethra, the two uniting at the arch and continuing to 

 the bladder as a single urethra. 



Injury to the penis of barrows is rare, although 

 incised wounds may sever this organ. The penis of 

 boars may be injured by permitting breeding in quarters 



