136 SWINE IN AMERICA 



and as valuable for breeding as before. Others will re- 

 cover from the disease, but never again be good breed- 

 ers. This immunity after an attack of cholera is not 

 transmitted to their progeny. James Riley, the veteran 

 Indiana breeder, said, after a quarter-century of expe- 

 rience with cholera : "I regard a sow that has had the 

 disease and fully recovered, if it has left her a breeder, 

 as very valuable. I think sows should not be bred for 

 at least two months after fully recovering. At least 75 

 per cent of our sows that had the disease proved to be 

 breeders. It affected mature sows less than younger 

 ones. Those that have great constitutional vigor are 

 able to resist the disease. Sows that have resisted and 

 recovered will frequently breed stronger and more vig- 

 orous pigs." 



IMPORTANCE OF EXERCISE 



snow covers the ground is something of a problem, but 

 inasmuch as she will be less inclined to take exercise at 

 that time efforts should be the greater to see that she has 

 enough to keep her in good condition. Left to herself 

 the sow may do little more than go out to eat and drink, 

 returning as quickly as possible to her quarters. James 

 Atkinson, editor of the Homestead, and a practical swine 

 grower, makes the following suggestion: "No greater 

 mistake can be made than to let sows have their own 

 way in this. It matters not what area they have access 

 to they will seldom strike out and make paths in deep 

 snow, and because of this we have found it an excellent 



