Farmers cull herds and clear hog barns to prepare for layer, broiler or duck production in same space.
Several factors have disrupted agricultural markets, altering outlook from earlier this year.
Perdue says agency will take quick enforcement action if any unfair practices are detected.
ISAAA report details how biotech crop plantings have increased about 113-fold since 1996.
Feed buyers will be looking at lower costs for corn and soybean meal over the next year.
Corn and wheat export inspections also land on the high end of trade estimates
Agency reports improving crop conditions over the third week of August