SIMPLE RULES FOR BREEDING 109 



defects; but in the event of in-breeding, es- 

 sentially close in-breeding, physical defects 

 will likely be greatly accentuated, and consti- 

 tutional disease all the more." 



The fancier must understand line-breeding, 

 but unless he practices restraint, he may be 

 tempted to go too far and use animals lacking 

 in stamina, thus producing a strain that is 

 physically degenerate. 



It is considered wise to mate an old doe with 

 a young buck, and vice versa, rather than two 

 old rabbits, however good. 



