314 MAINE AGRICULTURAIv e;xP]i;rIMENT STATION. I912. 



Matings of Barred Plymouth Rock males of class"" 7 



Males of class 7, having a gametic constitution fLL^. fhL^,, 

 were used more often than any other sort in the pure Barred 

 Rock matings. They are homozygous with reference to the ab- 

 sence of the first production factor L-i, and the presence of the 

 second or excess production factor /,?. A reference to table 9 

 shows that there should be no zero winter producers among 

 their progeny. The proportions of high and poor layers in the 

 progeny depend upon the nature of the female with which the 

 male is bred. For convenience the matings of each individual 

 male will be discussed separately. 



B.P.R. $ ^'^j. Indicated gametic constitution =^- fkL-^. fhLi. 



This male was hatched in the spring of 1908 and used as a 

 breeder in the season of 1909. His successful 'pure' matings 

 (i. e., those with B.P.R. females which produced adult female 

 progeny) were as follows: 



Matings: A. With 6 ? 5 indicated to be of class 2=/Z,:iI,2- FLik- 

 5 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 13 



Expected 15 O 



Mean winter production of 5 ? 

 in indicated class Sl-33 eggs 



B. With 3 ? ? indicated to be of class i =: fL-iL^. Pkk- 



? Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 6 o 



Expected 7-5 7-5 



Mean winter production of $ ? 



in indicated class 5SSo eggs 13.56 eggs 



C. With 255 indicated to be of class 4 = fL^U- FLxh. 



5 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 4 o 



Expected 4 



Mean winter production of ? $ 



in indicated class 3975 eggs 



"The 'class' numbers throughout refer to the arbitrary designations 

 given in tables 5 to 10 inclusive. 



