1 he General Infections of the Genital Organs of Cattle 365- 



used frequently, with no conceptions. The sudden sterility 

 of about 75 per cent, of the herd had been thought to be due 

 wholly to the condition of the cows. A large proportion of 

 the cows (36.5 per cent, of those served) showed macro- 

 scopic pathologic changes, especially cervicitis, but only in 

 a few cases of sufficient severity to account for sterility on 

 such a large scale. 



Fig. 113 — Spermatozoa from Bull No. 4. 



Number comparatively low. Cells non-motile when ejaculated. 

 Many Tailless Spermatozoa. 



On Dec. 5, physical examination revealed a severe balano- 

 posthitis and testicles slightly atrophied, with slightly di- 

 minished tone. Coitus was normal. About 7 mils, of semen 

 were obtained, which was very viscid, of a light straw 

 color, and more translucent than normal. 



The spermatozoa were non-motile. About fifty per cent, 

 of the normal number were present. In fresh specimens, 

 many spermatozoa lay upon their sides, giving the appear- 

 ance of extremely narrow heads. In stained preparations 



