URO-GENITAL SYSTEM 199 



dram, phenol one dram and cotton seed oil four ounces is an effective 

 repellent 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 larvffi are present and the san- 

 guineous discharge continuous. One application daily is sufficient. 



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 per- 

 mitting breeding in quarters containing machinery or other places 

 where injuries of various kinds may be inflicted. 



Preputial concrements or calculi sometimes occur in swine. They 

 occasion difficulty in urination or even retention of urine and some- 

 times the urine accumulates in the sheath in considerable quantities. 

 The accretions are easily detected by an examination and are not 

 difficult to remove. 



The lining of the prepuce may be infested with screw-worms, which 

 will occasion considerable swelling and distress to the animal. For 

 the treatment see page 198. Preputial inflammation due to irrita- 

 tion from urine and infection sometimes requires care by cleansing 

 and antiseptics. 



Ovary 



MALFORMATIONS AND INJURIES 



Malformations of the ovary are much more common than is gen- 

 erally suspected. The most frequent anomaly consists of clianged 

 position which ordinarily does not appear to interfere with the nor- 

 mal functioning of the organs. There may be two ovaries on one 

 side and one on the other, or there may be two ovaries on each side. 

 Either ovary may be exceptionally large or small, the other being 

 normal in size. 



The ovaries may be injured, but this is rather the exception, owing 

 to the thick body wall which serves as a protection. 



