102 



Pork Production 



ance for the factor of age, therefore, it would seem that 

 the difference of less than one pig is too small to justify 

 the conclusion that cross-bred litters are larger than 

 pure-bred ones. 



TABLE XVIII. EFFECT OF CROSS-BREEDING ON SIZE OP 

 LITTERS 



Influence of the boar. 



That the boar to which the sow is mated exerts an 

 influence on the size of the resulting litter is believed by 



