372 



Diseases of the Genital Organs 



tions. Twenty-one of the cows (42 per cent.) served did 

 not conceive. Examination of cows revealed little cause for 

 sterility. Examination of bull revealed presence of seminal 

 vesiculitis on left side. Organs and erection normal but, 

 owing to the custom of placing cows for service with their 

 hind parts raised, half an hour to an hour was often re- 

 quired to serve a cow, leading to an increased strain on the 

 genital apparatus, which may have been a potent factor in 



Fig. 119. — Spermatozoa from Bull No. 11. 



Cell heads stained poorly, because the nuclear membrane was imperfect. 



the production of the spermato-cystitis and decreased fer- 

 tility. Owing to unfavorable conditions for coitus, I was 

 unable to get a sample of semen. 



Bull 11, Fig. 119. Four-year-old. Has served sixty-two 

 cows, with a total of one hundred and seven copulations, 

 resulting in twenty-nine conceptions and eleven (37.9 per 

 cent.) abortions. From the first his fertility has been low. 

 Twenty-eight cows served by this bull (45.1 per cent.) sub- 

 sequently conceived from service by another bull. 



