Abstract AS WAS so aptly stated by Jull (1932) “the inheritance of the ability to lay well over a period of years is of immense practical importance and is deserving of much more consideration than it has received up to the present.” If the trait of continued high egg production through several years (longevity) can be bred into a flock, just to that degree can the cost of replacing hens with pullets be reduced. It is not inconceivable that in a farm flock so bred a majority of hens exceed 120 eggs each annually up to 4 or 5 years of age, the raising of chicks could be put on the biennial basis and the hatching egg and baby chick income augmented during off years. The enhanced value of a continuous high producer, that lives through several years, in the breeding pens where progeny testing is practiced, cannot be overemphasized. Several experiment . . .