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250 pullets 50 bird pens average egg production average production band number Barred Plymouth Rock bulletin closely selected coefficient of correlation coefficient of variation compared corre correlation between mother correlation coefficient correlation table corresponding period daugh daughter in respect daughter's aver daughters of 200-egg degree of inheritance discussion domestic fowl duction egg producing ability egg records eggs inclusive eggs per bird exceptionally poor experiment figures flock frequency distributions individual daughter individual mother inheritance of egg inheritance of fecundity June laying measured mother and daughter Mother's Egg mother's individual Mothers weighted number of daughters ovum probable errors produce daughters pullets in respect RAYMOND PEARL relative respect to egg selective breeding showing the egg sixth column so-called registered spring egg production spring March spring months spring production Station study of egg Table VII tered tion unregistered Variation in Egg winter egg production winter November winter performance winter production