The General Infections of the Genitalia of Swine 751 



The principles, therefore, in controlling losses from geni- 

 tal infections in swine are to grow pigs under the best known 

 hygienic rules, being careful not to overfeed, keep them in 

 the cleanest practicable quarters and, when using cow's milk 

 or by-products thereof, sterilize the latter before feeding. 

 In these precautions no sex distinction is to be made. Sows 

 should be closely watched in parturition and, if necrotic em- 

 bryos are expelled or the litter is low in number, the sow 

 should be discarded and her litter go with her. The boar, 

 too, is to be observed carefully and, if at all suspected, 

 should be subjected to examination by a skilled veterinarian 

 along the lines already traced for bulls. 



Swine breeders have limited their care in mating too 

 strictly to the avoidance of hog cholera. The prudent 

 breeder should use great care in accepting sows from other 

 herds for breeding because of the ever-present danger from 

 infections of possibly greater virulence than those existing 

 within the herd. In selecting males for breeding, one should 

 be taken from a large litter, indicating thereby that the 

 dam was healthy and that consequently her pigs were, in 

 the largest available degree, also sound. The general rules 

 of care regarding moderate feeding and abundant exercise 

 should be applied intelligently. 



