STUDY OF SELECTIONS FOR SIZE, SHAPE, AND COLOR OF HENS' EGGS 269 



Relation between vigor of the chick and size of the egg from which it was hatched 

 In 1911-12 a separate record of the vigor of the chicks, as well as of their 

 weight, was made for the first forty weeks of their lives. The vigor was 

 ^recorded in four classes: Very Poor (V.P.), Poor (P), Good (G), Very 

 Good (V.G.). Correlation tables such as table 59 were constructed 



TABLE 59. VIGOR OF CHICKS AT THE AGE OF FOUR WEEKS, SUBJECT; WEIGHT (IN GRAMS) 

 OF EGGS FROM WHICH THE RESPECTIVE CHICKS WERE HATCHED, RELATIVE 



Coefficient of correlation = .381 =fc .064 

 44^6 46^8 48-50 50-52 52-54 54-53 56^58 58-60 60-62 62-64 64-66 



1 



x 







11 14 



10 



80 



for each four weeks of the chicks' lives. A summary of the results of 

 rthe correlation tables (space for which cannot be taken here) is given in 

 table 60. In this table the respective weight correlations also are shown. 



TABLE 60. SUMMARY OF COEFFICIENTS OF CORRELATION FOUND IN STUDYING THE 

 RELATION OF THE WEIGHT AND VIGOR OF THE CHICKS, SUBJECT, AND THE WEIGHT OF 

 THE EGGS FROM WHICH THE RESPECTIVE CHICKS WERE HATCHED, RELATIVE 



* The vigor was not recorded at the one-day-old period, because it was impossible to designate the dif- 

 ferent classes at this early age. 



In recording the data for these vigor studies, a special effort was made 

 to be sure that the record for vigor was made independently of the record 



