Breeding 



445 



of destroying a type which has required many years of 

 patient effort to build up is to make a radical out-cross. 

 When outside blood is necessary in order to avoid the 

 possible evils of in-breeding, experience shows that it 

 should be introduced in a rather dilute form, that is, by 

 selecting a sire from some closely related strain. 



In-breeding. 



In principle, in-breeding is the opposite of cross-breed- 

 ing. It means the mating of individuals more or less 

 closely related. If the individuals are as closely related 



OHIO CHIEF 



D. B's Dutchess 



76842 



HIGH CHIEF 

 13423 



8727 



ARLIE M. 

 28520 



f JOHN'S OHIO 

 CHIEF 

 17483 



OHIO CHIEF 



8727 



WATSON'S 

 DUTCHESS 



MAYWOOD S. 4th 

 3240 



as full brother or sister, half brother and sister, first 

 cousins, sire and daughter, or dam and son, it is called 

 close in-breeding or incestuous breeding. Practically 

 all in-breeding takes the form of line-breeding. Line- 

 bred pedigrees show the repeated introduction of the blood 



