96 



POULTRY BREEDING AND MANAGEMENT 



rest upon individual performance. A knowledge of indi- 

 vidual performance is only possible where the trapnest is 

 used. 



It seems to the writer that the extreme difference in the 

 yield of 55 eggs as the winter production of the dams and 

 15 eggs for the daughters, cannot be satisfactorily explained 



except upon the theory 

 that environmental con- 

 ditions were unfavor- 

 able in the case of the 

 daughters that the 

 conditions surrounding 

 their breeding and man- 

 agement were in some 

 way unfavorable to high 

 production. 



mThe methods followed 

 in selecting the breeding 

 H stock, in the nine years' 



experiment, was to use 

 only hens that had 

 records of 150 eggs or 

 more, and after the first 

 year male birds only 

 were used whose dams 

 laid 200 eggs or more. 

 At the Oregon Station, later experiments produced dif- 

 ferent results. The records of six years' breeding work 

 with Barred Plymouth Rocks are summarized on the next 

 page. 



The original flock of 95 pullets were purchased from six 

 different breeders. The first and second years' results have 

 little significance so far as the question of inheritance is 

 concerned. There had not been time enough to make selec- 



BARRED PLYMOUTH ROCK HEN 65 

 218 EGGS 



Oregon Station's first 200-egg hen. Her 

 daughter and granddaughter on p. 97. 



