618 VETEEINAEY HYGIENE 



The bull and not the cow may be the means of intro- 

 ducing infection, especially -where the bull is permitted to 

 perform service on outside cows. 



The practice of service being performed within a month 

 or two after calving, increases considerably the risk of 

 infecting the bull and of spreading the disease. 



Abortion occurring among dairy stock must be regarded 

 in a serious light, and every effort made to reduce the 

 probable chance of the infection spreading, by the isolation 

 of the cow at some distance, the destruction by lire or deep 

 burial of the foetus in quicklime, the destruction of the 

 membranes, bedding and excreta by fire, or deep burial in 

 lime in some place where cattle have not access. 



The evacuation of the stall is imperative, it must be 

 thoroughly washed and disinfected with a 1 in 20 solution 

 of sulphate of copper, which experiment shows to be 

 destructive of the organism, and less likely to get mixed 

 up with the milk than corrosive sublimate, and not likely 

 to taint it like preparations of phenol. 



This disinfection must be thorough, and repeated two 

 or three times for safety. It should not be confined to 

 the affected stall, but the entire shed done and the same 

 repeated at intervals. 



In Denmark good results have been obtained by freely 

 sprinkling the floor with powdered lime. 



The other cows must be watched, and any showing 

 impending signs of abortion at once removed. Daily 

 washing of their external genitals, anus, and root of tail 

 with a 1 in 1000 solution of corrosive sublimate or other dis- 

 infectant may be practised, while newly calved cows may 

 in addition receive a vaginal injection once or twice a day 

 for a week. 



The aborted cow is dangerous for a few weeks, and it is 

 also probable she may infect others before she herself has 

 aborted. 



All isolated cows must have attendants to themselves ; 

 the above measures are of no use if the same persons look 

 after both the sick and healthy. 



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