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Truck market offers fell by $3 per ton at processing plants in parts of Iowa.
On the rail market, offers were $1 per ton weaker at Midwest locations.
Most livestock and poultry producers already had booked enough orders to last them through Christmas, brokers and traders said.
Both rail and truck logistics were running smoothly despite snow and cold temperatures across the Midwest.
If the wintry weather slows some rail deliveries there will likely be a bump in truck market activity, which could support gains in the basis in coming days, a mid-South broker said.
At 10:01 a.m. CST (1601 GMT), Chicago Board of Trade January soymeal futures were up 80 cents at $317.00 a ton.