I wanted to revisit this issue just to let everyone know that I heard back from Ms. Fischer at Purina. She affirmed what Bob has stated, that the additional corn was added to meet the required energy content of the feed, and that production is expected to move back to Richmond, whereupon the feed will revert back to the older, more familiar formulation.
I think it is important to note that Ms. Fischer tried a few times to call me with this information, but as it was apparently after my shop office hours, she responded via email.
I greatly appreciate her efforts in this matter.