A:   We have completed research using cattle grazing Bt and non-Bt corn residue fields and saw no difference in cow performance and calf performance. The calves were weaned calves in the fall. What I think is going on in your situation is that stalk grazing is new to these calves and they a use to eating grass and that's what they are doing. Calves in our stalk grazing experiments will graze the fence-line and ultimately begin consuming the residue in the field. What you might consider is putting a cow that is an experienced corn stalk grazer with the calves and she can show the calves how to graze the stalks.