The corn for silage was harvested at 3/4 milk line
stage of maturity using a field chopper with knives
adjusted to a 1-cm theoretical length of cut. For each
hybrid, the chopped corn was ensiled in a separate Ag-
Bag plastic silage bag (AgBag Int., Warrenton, OH)
prior to the start of the beef and dairy experiments.
Silage bags were opened and the feeding trials began
a minimum of 100 d after ensiling. Grain was harvested
at 85.3% DM for the earlier-maturing Bt and non-Bt
hybrids (129 d after planting) and at 84.9% DM for the
later-maturing hybrids (172 d after planting).