328 MAINE AGRICULTURAL LXPLRIM^NT STATION. I912. 



possibly both) and the reproductive system started to function 

 in the normal way and bring to somatic expression these gametic 

 factors. But before this could be done the diseased condition 

 of the organs brought the bird as a whole into such a condition 

 of reduced vitality that egg production was impossible. 



The other bird's zero record is probably a somatic fluctuation 

 from an 'Under 30' hereditary constitution. She began laying 

 very shortly after the end of the winter period. 



It is of interest to note that the mean winter productions are 

 relatively rather low for the 'Over 30' classes in all matings. 

 The contrast between 5 D31 progeny and that of S 563 (vide 

 supra) in this respect is striking. This matter will be discussed 

 in detail later. 



Summary and discussion of matings of class J Barred Ply- 

 mouth Rock males. Having now presented in detail the evi- 

 dence respecting the matings of class- 7 males with various types 

 of females it is desirable to. collect and summarize this material. 

 In tables 11 to 16 inclusive are given the assembled results of 

 all matings of certain particular types. It will be understood 

 that these are all pure Barred Rock matings and represent the 

 summation of the data previously giveij. These tables give the 

 total numbers of different males and females from which data 

 were obtained in each class of matings, as well as the classifica- 

 tion of the adult female progeny in respect to fecundity. 



TABLE II 

 Showing the results of all matings of class 7 <^ c? X class / $ ? 



/'i-L'2 • Jn-L/z X JJ-<iJ-i2 ■ ^ hh 



Number of Individ- 

 uals Involved in 

 Matings of This Type 



Winter Egg Production of Adult Daughters. 



c?c? 



99 



Class 



Over 30 



1 

 Under 30 Zero 



Total acult 9 

 offspring 



10 



75 



Observed 

 Expected 



92i 



101.5 



103* 



101.5 



7 

 



203 



Mean winter egg production of all 

 daughters in designated class .... 



54.19 eggs 



15.52 eggs 



eggs 





