138 MAINE AGRICULTURAL EXPERIMENT STATION. I9II. 



and Station cockerels as possible. It is essential in such an 

 experiment that the average age, health, vigor, size, and egg-pro- 

 duction should be approximately the same in the females mated 



House 



Pen 









No. 



No. 



Foreign Cockerels. 



Station Cockerels. 



Females. 







5 



D70 



1 











6 





D2* 











7 



D60 













8 





D32 











9 



D65 













10 





D5 











11 



D56 









1 





12 

 13 

 14 

 15 

 16 

 17 

 18 

 . 19 



D58* 

 D61 

 D57 

 D68 



Dll 

 D16 

 D35 

 D17 





All females 



from 



Station stock. 



2 





r20 



121 





D26 













D31 







* This bird got ro adult ? progeny in 190S and is dropped from further discussion 

 here. See text. 



to the one class of cockerels as in those mated to the other 

 class. Data regarding this and other matters related to the 

 breeding history of the birds in this experiment are given in 

 Table D. One of the foreign cockerels (No. D58) and one of 

 the Station cockerels (No. D2) produced no adult female 



TABL15 D. 



Data Regarding Breeding History of Individuals in. Inbreeding 



Experiment. 



Item. 



Foreign Cockerels. 



Station Cockerels 

 in House No. 1. 



Station Cockerels 

 in House No. 2. 



Number of d" c? in exper- 



7^ 

 120 



26 



21.7 

 33.26 



44.31 



6 

 93 



17 



18.3 

 31.96 



39.53 



2 



Number of ? ? mated 

 with these d" cf * 



Number of 5 ? which 

 produced adult daugh- 



33 



15 



Percentage of 5 ? which 

 produced adult daugh- 



45.5 



Mean winter egg produc- 

 tion of all ? ? mated 



Mean winter egg produc- 

 tion of all ? 9 which 

 produced adult daugh- 

 ters 



27.70 



28.27 







* This is the total number of ? ? mated during the whole season and includes indi- 

 viduals put in to replace those removed. The number of 9 $ with each male in the 

 pen was at any given time only the number stated above (p. 137). 



