--Most hog futures extend decline on ideas that supplies may expand

--Front-month hog contract supported by gains in cash markets

--Cattle futures also mixed amid tight near-term supplies, cash expectations

By Kelsey Gee

CHICAGO--U.S. hog futures are mostly lower early in the session Thursday, as strong gains in the front-month contract amid rising cash market prices are offset by concerns about expanding supplies of available animals during the winter months and beyond.

October hog futures recently advanced 1.45 cents to $1.0255 cents a pound at the Chicago Mercantile Exchange. That contract has rallied to the highest price in three weeks, ushering in expectations for demand to further strengthen for wholesale pork items.

Hogs for December are down 1.62 cents to 91.47 cents a pound. February hog futures recently slid 2.95 cents, just above the exchange-imposed daily limit, down to 88.02 cents a pound.

Prices processors have paid for hogs in the cash markets have stabilized after falling over $30 per hundred pounds over the last six weeks, as retailers have increased purchases of less expensive hams, loins, and other products.

However, news that Zoetis Inc. received a conditional license from the U.S. Department of Agriculture for a vaccine for a deadly swine virus has weighed on expectations for prices packers may be willing to pay this winter, if supplies of hogs increase.

Death loss due to the virus, which has spread to 30 states and is expected to have killed millions of pigs, has helped push hog futures to the highest price levels in history. With an additional treatment available to producers this month, analysts expect fewer pigs to be lost to disease as temperatures drop this fall, conditions that veterinarians say aid the spread of disease.

Cattle futures are also mixed after climbing limit-up Wednesday. Ideas that prices may rise in the cash markets for cattle amid tight supplies are being offset by profit-taking in later contracts. October live cattle have trimmed earlier gains, recently rising 0.9 cent to $1.56325 a pound. December cattle are down 0.725 cent to $1.57275 a pound.

Cattle "numbers are tight enough that buyers are picking up supplies hand-to-mouth," said Trey Warnock, an analyst with Amarillo Brokerage in Texas, noting the cautious gains at historically lofty prices for market-ready animals.

Most-active feeder-cattle futures for October recently slid 1.5 cent to $2.2027 a pound.

Write to Kelsey Gee at kelsey.gee@wsj.com

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