Mike Howlett of Top Third Ag Marketing said grain prices were weaker overnight due to lower gold trading and profit taking. Gold after yesterday's drop in prices is trading a lot lower today, and there is concern grains may follow. Export numbers are OK for corn and beans, wheat lower than anticipated. Ethanol production is still growing. The U.S. will overtake Brazil this year in the production of ethanol. Opening today on grains: Corn 4-5 lower, beans 4-6 lower, wheat 5-7 lower.