BREEDING POULTRY FOR EGG PRODUCTION. 



143 



From these data it appears that there is no substantial dif- 

 ference in egg production, either in the winter or the spring 

 periods, between the pullets which came from entirely unrelated 

 parents on the one hand, and those whose parents both belonged 

 to the Station strain on the other hand. In the winter period 



OUTCROSS 



MOTHER'S WINTER PRODUCTION 



OUTCROSS 



DAUGHTER'S WINTER PRODUCTION 



DAUGHTER'S SPRING PRODUCTION 



INBJSBD 2 



Fig. yy. Diagram showing the mean winter and spring egg produc- 

 tion of the daughters of outcross and narrow matings. 



it is true that the birds from out-cross matings have a slightly 

 higher mean production than either group of narrow-bred 

 daughters. The difference, however, is too small to be signifi- 

 cant. Thus the greatest difiference in the table is between the 

 winter rheans for the out-cross matings and the narrow matings 

 in No. I house. Here, however, the difference is but 2.89^1.55, 

 an amount less than twice its probable error. In the spring 

 period the daughters from out-cross matings actually laid a 

 little less than those from the narrow matings. 



