a reader writes:
However, I take stock in the 2003 study done at Penn State U by H.D. Karsten:
http://www.poultryscience.org/spss03abs.pdf(see abstract 60, page 15)
It looks like they were testing 200+ eggs per group... They DID find that the pasture eggs had more good stuff in the yolks, but it's not as overstated as the mother earth stuff. Might be worth trying to track down a copy of the paper/study (or maybe there is just the abstract, idk)"