BREEDING, LINE AND IN-BREEDING 



49 



that a male has been chosen from the group from which they start. 

 The white circles and segments represent the female blood ele- 

 ments and the dotted lines that the females have been chosen from 

 the group from which they start. The shaded circle represents a 

 scheme for the admission of new blood. Suppose we have two 

 extra good birds which when mated together produce high-class 

 offspring. Then the problem is how to perpetuate the quality of 

 the parents and offspring without the dangers of close in-breeding 



Lir/E BREED/KG CHSIRT 



W/U.E LINE. FEWLE L/QIE; J^J / s * 



'\Z 



By the courtesy of the Editor of "Poultry" 



or of destroying the results of several years of work, by violent 

 out-crossing. By following line breeding, three blood lines may 

 be developed, one of which shall contain a preponderance of orig- 

 inal male blood, one a preponderance of original female blood, and 

 the third equal proportions of original male and female blood. 



In the chart let 1 represent the original male, and 2 the original 

 female. Then by crossing 1 and 2 the result is group 3, which pos- 

 sesses equal parts of the blood of 1 and 2. Selecting the best pullet 

 from 3 and mating to her sire 1, group 4 is produced, which con- 



