Table 12. — Correlation in Fertility between Sires' Dams and Sires' Daughters. 



35 



Constants calculated from Table 12. 

 Sires' Dams' Mean Fertilit.y 

 Sires' Dams' Standard Deviation 

 Sires' Daughters' Mean Fertility 

 Sires' Daughters' Standard Deviation 

 Coefficient of Correlation . 



.81 83 ±.003909 

 .1585 ±.002764 

 .7364 ±.007 108 

 .2882 ±.005026 

 -.0501 ±.024599 



The mean fertility of the dams of the males used in this study is .0819±.008112 

 greater than the mean for the daughters of these males. The males used, there- 

 fore, came from dams of high fertility but the daughters of these males failed to 

 measure up to such a standard. The standard deviation of the daughters is almost 

 twice as great as for the sires' dams, showing that the daughters are a highly vari- 

 able lot. The coefficient of correlation is negative but insignificant because of the 

 magnitude of its probable error. The conclusion seems justified, therefore, that 

 the degree of fertilit.y of a sire's dam is no index to the degree of fertility that his 

 daughters will exliibit. 



Section 13. Relation of Sire's Dam to his Daughters' Hatchability. 



If the hatching power of a sire's dam is something of an index to his probable 

 inheritance of factors affecting hatchability, such relationship vnW appear when the 

 hatchabiUty records of the daughters are tabulated with the records from the 

 sires' dams. Table 13 is thus made up of the same birds used in table 12. 



