98 



Pork Production 



affects the fertility of the individual sow, the breeding 

 records of ten colleges and experiment station herds were 

 studied. 1 These records are of 1152 litters and 10,555 

 pigs. The tabulated data are shown in Table XVII. 



TABLE XVII. NUMBER OF PIGS AT BIRTH IN SUCCESSIVE 

 LITTERS OF INDIVIDUAL Sows 



As shown in the above table, 244 sows produced in 

 their first litters an average of 7.778 pigs. These same 

 244 sows in their second litters produced an average of 

 8.922 pigs, or 1 444 in excess of their first litters. Of 

 these 244 sows, 243 produced their third litters, the 



1 South Dakota, Wisconsin, Michigan, Illinois, Cornell, 

 Missouri, Nebraska, Kansas, Ohio, Purdue. 



