PROBLEM OF 



101 



layers, produced daughters 

 that averaged 117.1 eggs 

 each. Mated to good layers 

 the daughters averaged 179.7 

 eggs. The same result is 

 shown in the case of the sire 

 whose dam laid 218 eggs. 



Selection and Cross Breed- 

 ing. - - Is the problem of 

 higher fecundity a question 

 of selection altogether, or is 

 it a question of constitutional 

 vigor alone? Does the work 

 of the breeder begin and end 

 with selection, or does it begin 



and end with vigor in the stock ? It is well known that many 

 strains of pure breeds, due to close breeding or other causes, 

 lack in vigor. It is also known that crossing two breeds or 

 varieties will restore the vigor lost by close breeding, and 



A 



D39 270 Eggs 



C58 205 Eggs D74 244 Eggs 



DAUGHTERS OF A77 



