132 POULTRY CTJLTTJBE 



number 2, produce group 8, that are seven-eighths the blood of 

 number 2, and a cockerel from number 4, mated back to the 

 original dam, number 1, produces group number 6, that is, 

 seven-eighths the blood of the original dam and only one-eighth 

 the blood of the original sire. 



Again we select a male from number 8 and female from 

 number 6, and for a third time produce chicks (in group num- 

 ber 2) that are half the blood of the original pair. This is the 

 third step and the ninth 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 pre- 

 ponderance of blood was that of the original sire. Numbers 

 2, 8, 13 and 18 are virtually the blood of number 2. 



We have reached a point where we would establish a male 

 line whose blood is virtually that of the original dam, and we 

 mate with a female from number 4 and produce group number 

 9, which is thu'teen-sixteenths the blood of the original dam, 

 number 1, and three-sixteenths the blood of the original sire. 



Again we select a male from number 9 and a female of the 

 new strain, number 11, and produce group number 14, which 

 becomes twenty-one thirty-seconds of the blood of the original 

 dam, thus preserving her strain of blood. 



A male fi-om number 13, which is thirteen-sixteenths the 

 blood of the original sire, number 2, mated to females from 

 number 10, which are five-sixteenths the blood of the original 

 sire, number 2, gives us group 17, which is nine-sixteenths the 

 blood of the sire. 



While in number 16 we have the new strain and in number 

 18 the strain of our original su-e, number 2, we have three 

 distinct strains, and by and by, with this systematic use, we 

 can go on breeding for all time. 



J3y the accompanying chart it is easily seen that if one was 

 to mate she and dam from either of the groups 3, 7, or 11 there 

 would be no change in the blood, and if we should continue 

 these with their offspring for three generations we would find 

 it difficult to hatch more than 3 per cent, laid by these three 

 generations from either of the half-blood groups; for all that 

 these 3, 7, and 11 groups are in main spokes in the wheel of 

 line breeding. 



