Study of Selections for Size, Shape, and Color of Hens' Eggs 253 



In table 57 the eggs incubated were grouped according to size and 

 incubation results, in order to see whether any effect on the incubation 

 record exists. No definite effect is shown by the data available here. 



Relative variability of the productions of successive years 



The standard deviation for all the eggs produced each year by each 



of the available hens was studied, in order to learn whether there is an 



approach to a definite egg type for the eggs produced by a hen as she 



becomes older. The' data from this study are collected in figures 26 and 



■3/ze-se>bc/iK)fr £>//x/s. 

 3.40 



. S/Ta/jerse/ec/zo/? jb/h/s^ _ Co/or ^se/ec/zb/? iv'/ds.^. 



Year 1st 2d 



Pig. 26. standard deviations for successive years, grouped as to character 



The figures in parenthesis designate the number of birds available for the respective calculations 



27. In figure 26 the studies are segregated into the three character 

 groups. The reduction of the number of birds available for study in 

 the fifth and sixth years makes the data for these years of doubtful value, 

 altho the number of eggs used for each bird is in each case sufficient to 

 make the standard deviation of real value. 



