Lean-hog futures also fell broadly on pressure from the global selloff and signs of rising supplies of slaughter-ready animals.
CME October hog futures fell 0.57 cent, or 1.5%, to 86.82 cents a pound. CME December hog futures fell 1.1 cents, or 1.3%, to 83.12 cents a pound.
Cash prices for slaughter-ready animals have steadily fallen over the last two weeks as the industry prepares for a seasonal growth in supplies that starts ahead of early fall. Analysts project this week's total hog slaughter to be the biggest since April.
As supplies grow, investors are carefully watching cash markets, since October futures are trading at a steep discount to cash prices, but still at historically high levels for the October contract, which expires Oct. 14. Cash prices and futures converge as a contract nears expiration.
The wider-than-usual gap between futures and cash is due to a recent run of record prices in pork after China boosted its pork supplies to control inflated food prices and a Midwestern heat wave tightened supplies. Summer heat waves can tighten hog supplies since hot, humid temperatures lead to slower weight gains in animals.
China said early Thursday it will move to import more pork if prices there don't stabilize.
Cash hog prices were reported steady to as much as $1 per hundredweight lower. Buyers were bidding cautiously and mainly for deliveries next week.
Predictions for the weekend slaughter are mostly around 2,000 or less head. The weekly total is projected to be about 2.050 million to 2.055 million, up from last week's 2.034 million estimate but down 1% from a year ago. Some livestock dealers and analysts predict slaughter next week to reach or exceed 2.1 million head.
The terminal markets traded steady to $1 per hundredweight lower on a live basis with top prices from $68 to $72 per hundredweight on a live basis.
The USDA's pork-carcass composite value, a measure of wholesale prices, on Wednesday was unchanged at $107.45 a hundred pounds.