VARIABILITY IN EGG WEIGHT 



11 



Number of families 670 



Dam's mean March variability in egg weight, grams . . . 2.07 



Standard deviation of dams' March variability +.81 



Mean March variability in egg weight of families, grams. . 2.04 

 Standard deviation of March variability of families .... +.71 

 Coefificient of correlation .0617 + .0260 



The variability in egg weight was essentially the same for the dams and their 

 families of daughters. The standard deviation was slightly lower for families 

 than for dams, as might be expected. The regression was linear, but the small 

 value of the coefificient of correlation fails to suggest inherited variability in 

 egg weight between mothers and daughters. 



Variability in Egg VVeight of Daughters from Dams of Different Classes 

 with Respect to March Variability in Egg Weight 



If variability in egg weight during the month of March is inherited, there 

 should be parallelism between the dams and daughters with respect to this 

 variability. In table 3 the dams are classified with respect to March standard 

 deviation in egg weight, and opposite each class of dams is placed the mean 

 family standard deviation of daughters from the diflferent classes. Figure 3 

 presents the data graphically. 



3.75 



3.25 



m 2.75 



2.25 2.75 3.25 3.75 4.2 5 



FAMILIES OF DAUGHTERS 



Figure 3. March Variability in Egg Weigiit of Dams and Their Families (119; 



