X'ARIABILITV IN EGG WEIGHT 



Oct NOV. DEC. JAN. FEB. MAR. APR. MAY JUNE JULY AUGL SEPT. 



MONTHS 



Figure 1. Mean Monthly Egg Weight for the Pullet Year. 

 (Grams per egg and ounces per dozen.) 



Individual Variability in Egg Weight 



The .-tandard deviation of a population gives a very satisfactory measure of 

 the variability of that population for a particular character. In the case of egg: 

 size it furnishes a good criterion of the relative uniformity in egg size at different 

 periods of the year and for birds of varying ages. Such information is often of 

 more value to the breeder than knowing the population means at different ages 

 or periods. 



In table 1 the mean monthl> egg weight and the monthly standard deviation 

 of the population are set forth. 



Table 1.— Me.an Mo.nthly Egg Weight and Monthly Variability in 



Egg Weight. 

 (Measured by the standard deviation.) 



*24.7 ounces to the dozen. 



