"Once again, I’m not arguing that the grass-fed alternative isn’t a viable response to the problems of factory farming grain-fed cows. I’m only suggesting to advocates of the grass-fed option that, if they feel so compelled to draw on the past to support the present, they should start by providing some footnotes."<p>McWilliams would be advised to do the same. All he listed were people <i>advocating</i> the use of corn to feed cows. He gave no evidence that cows actually <i>were</i> being fed grain at those time. In fact he's doing exactly what he accuses grass advocates of doing, just the opposite argument.