INHERITANCE OF FECUNDITY 189 



B.P.R. cf 552. Indicated gametic constitution = //1L2 . fUL^. 



This male was used as a breeder during two seasons (1909 and 

 1910). He was hatched in the spring of 1908. His sisters were 

 very poor winter layers, as shown by the following table. 



Winter -production 

 as pullets 

 Sisters of cf 552 Eggs 

 E 184 16 

 E 229 6 

 E 272 7 

 Mean winter production of family 9 . 67 



The mother of cf 552 ( 9 D725) was a good layer with a winter 

 record of 61 eggs. From her he evidently got an L2 factor which 

 his. sisters could not acquire in this way. The father was hetero- 

 zygous relative to L2 (belonging to class 4) and the only one of his 

 adult progeny from the mating with 9 D725 to bear L2 happened 

 to be the a" 552 here under discussion. In the following account 

 of cf 552's breeding history the progeny in both of the years in 

 which he was used in the pens are taken together. There is no 

 reason why the two years should be dealt with separately. 



Matings: A. With 4 9 9 indicated to be of class 2 = fLiL-,. FLih. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed Hi i ' 



Expected 12 



Mean winter production of 9 9 



in indicated class 48.27 eggs 



B. With 10 9 9 indicated to be of class 1 = /L1L2 . Fhh. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 17 15 2 



Expected 17 17 



Mean winter production of 9 9 



in indicated class ^ 54.71 eggs 12.47 eggs eggs 



