Achieving this position was probably accelerated by the
poor albumen quality of eggs from older breeder flocks
(Brake et al., 1997). Better hatchability of eggs stored SEU
might be associated with a more centralized yolk position
at setting and also due to the blastoderm location in the
equatorial region of the eggs as observed by Proudfoot
(1969a,b). Thus, as expected, storage in the SEU ameliorated
the decline in fertile hatchability associated with
extended egg storage.