158 MAINE AGRICULTURAL EXPERIMENT STATION. I9II. 



age winter productions were 23.87 and 2.4b eggs, respectively! 

 Certainly it seems reasonable to conclude that the gametic con- 

 stitutions involved in the breeding of 253 and 14 were quite 

 different, though both these hens laid the same number of eggs. 

 Again, take birds No. 386 and 911. One had a winter record 

 of 55 and the other of 52 eggs. Yet their daughters" average 

 winter productions were, respectively, 4.88 and 27.33 eggs. 

 Many more instances of this kind could be brought forward. 

 Taken together, the whole evidence shows beyond the shadow of 

 a doubt that the presence of high fecundity in an individual, and 

 that factor which" makes high fecundity appear in the progeny, 

 are two very different things, either of which may be present 

 in an individual without the other. We plainly have here the 

 basis for the distinction of phsenotypes and genotypes just as in 

 beans. 



the; inheritance; of egg production in pedigeee lines. 



Let us now consider some of the evidence that such things as 

 genotypes of fecundity really exist in fowls. We may first ex- 

 amine some representative pedigrees covering four generations 



Pedigre;b Line D5D39 



^ D39{6^)y< $ D5 ' 



9 E232{69)X $555—0 



237{55)X$554 

 Meanzz6B 



9 G10{100) 



14 (99) 



9¥2SS{4S)y.$564^ 88 M 



[ 524 {16) 



f 9 G 12 {16) 



303{64)X$563 



136 (^cS") 



347((5£»)X^5(5^. 



ZQ3 {74)'>^ $ 567 

 Mean-61 



19 {70) 

 39 {100) 

 53. {U) 

 81 (34) 

 85 {7S) 

 192 {57) 

 213 {'^9) 



9 G 18 {61) 



27 (S3) 



46{116) 



196 {56) 



211 {S6) 



248 {67) 



9 Gil {47) 

 134{111) 

 165 {35) 

 198 {39) 

 506 {16) 



'' Mean- 57.74 



