42 PROGRESSIVE POULTRY CULTURE 



"A male from group No. 3, mated back to his own 

 dam, No. 1, produces group No. 4, which is 3-4 of the 

 blood of the dam, No. 1, and 1-4 the blood of the sire, 



No. 2. 



"We select a cockerel from group No. 5 and a pul- 

 let from group No. 4, or vice versa, which will produce 

 group No. 7. This is mathematically half the blood of 

 each of the original pair, No. 1 and No. 2. This is a 

 second step towards producing a new line. 



"Females from No. 5 mated back to the original 

 male, No. 2, produce group No. 8, that are 7-8" the 

 blood of No. 2. A cockerel from No. 4, mated back to 

 the original dam, No. 1, produces group No. 6 that is 

 7-8 the blood of the original dam and only 1-8 of the 

 blood of the original sire. 



"Again we select a male from No. 8 and females 

 from No. | and for a third time produce chicks (in 

 group No. 11) that are half the blood of each of the 

 original pair. This is the third step and the seventh 

 mating in securing complete breeding of our new strain. 

 In all this we have not broken the line of sires, for 

 every one has come from a group in which the prepon- 

 derance of blood was that of the original sire. Nos. 2, 

 8, 13 and 18 are virtually the blood of No. 2. 



"We have reached a point where we may wish to 

 establish a male line whose blood is virtually that of 

 our original dam, and we now select from No. 6 a male 

 which we mate with a female from No. 4, and produce 

 group No. 9, which is 13-16 the blood of the original 

 dam, No. 1, and 3-16 the blood of the original sire. 



"Again we select a male from No. 9 and a female 

 of the new strain No. 11, and produce group No. 14 

 which becomes 21-32 of the blood of the original dam, 

 thus preserving her strain of blood. 



"A male from. No. 13, which is 13-16 the blood of 

 the original sire, No. 2, mated to females from No. 10, 

 which are 5-16 the blood of the original sire, No. 2, 

 gives us group No. 17, which is 9-16 the blood of said 

 sire, while in No. 16 we have the new strain and in 

 No. 18 the strain of our original sire, No. 2. Thus we have 



