INHERITANCE OE FECUNDITY IN DOMESTIC EOWL 



371 



all had the gametic constitution //i/2. FL-^L, as shown in the sec- 

 tion on the -Fi birds. The results of these matings are shown in 

 table 31. 



The observed figures are a rather bad, though not an impos- 

 ■sible, approximation to the expected Mendelian half. The 

 means indicate, however, that there is a definite segregation of 

 the two classes. It is possible that the discrepancy in the ratio 

 finds its explanation in a difference in the potency or absolute 

 fecundity value of the Cornish Indian Game Z.i factor and the 

 same factor in the Barred Plymouth Rock. 



TABIvE 31 



Showing the results of matings of the type B.R.P. <$ fkL^ . fliLi 

 X Black Ft ? fhh . PLih 



Number of Individ- 

 uals Involved in 

 Matings of This Type 



Winter Egg Production of Daughters Fi 



c?c? 



99 



Class 



Over 30 



Under 30 



Zero 



Total adult 

 9 progeny 



4 



4 



Observed 

 Expected 



5 



9.B 



14 

 9.5 











19 



Mean winter egg produ 



ction of all 



37.00 eggs 



11.14 eggs 















Two of the class 7 B.P.R. males (562 and 567) were mated 

 with two Fi blacks whose sire was C.I.G. $ 558. It has already 

 been shown from the pure Cornish and F^ matings that this 

 Cornish $ 558 had the gametic constitution jIaI:. fhh. In 

 respect to fecundity his F, daughters in the 'Under 30' class 

 were gametically of two types : viz., fL^U. Fhh and /X1/2. FLdi. 

 None of the second type v/ere used in these matings. Only a 

 ■small progeny resulted from the mating of the two females of 

 the first type. The actual results were as follows : 



2 Progeny 



Winter Production: 



Observed 



Jo,xpected 



Mean winter egg production of 

 all ? ? in indicated class . . 



Over so 

 2 

 3 



Under 30 



4 



Zero 

 o 

 



38.00 eggs 8.5 eggs 



