INHERITANCE OF FECUNDITY 195 



-4// 9 Progeny 



Wilder Production: Over SO Under 30 Zero 



Observed 10^ 7| 1 



Expected 11.5 7.5 



Mean winter production 49.80 eggs 15.71 eggs eggs 



The zero bird here is an exception for which no apparent ex- 

 planation is forthcoming. She was not pathological. She was 

 however a June hatched bird. Unfortunately she was not bred, 

 and therefore it is not possible to be sure of her gametic constitu- 

 tion. In spite of the fact that the total number of progeny here 

 is small, there is little doubt of the correctness of the classification. 



The mean productions for birds in the 'Over 30' class in the 

 several matings are comparatively a little lower than those of 

 the progeny of other class 7 males. It is interesting to speculate 

 as to whether this may be connected with the lack of great vigor 

 on the part of the sire. No data are available from which to 

 get critical evidence on this point. 



B.P.R. cf 56. Indicated constitution = fkL-^ . fkL^. 



This bird was purchased in January, 1908, from Mr. C. H. 

 Welles of Stratford, Conn. It came from a strain of Barred Rocks 

 well known in the show-room, but not specially bred for egg pro- 

 duction. This fact is of interest in connection with the breeding 

 history of the bird, which indicates clearly that he was homo- 

 zygous with respect to L2. The result shows, in other words, that 

 a male Barred Rock from a strain bred purely for the fancy may 

 still carry in pure form the factor for high egg production. 



This male bird (56) was bred two seasons (1908 and 1909). 

 The first year he got but very few adult daughters, owing to the 

 unfavorable conditions under which all the breeding had to be 

 done in 1908 (cf. Pearl and Surface 35). In 1909 the results 

 were better. The adult daughters from both seasons are taken 

 together in the following breeding history. 



