CHICAGO, July 6 (Reuters) - Live cattle futures on the Chicago Mercantile Exchange closed narrowly mixed on Monday as pressure from last week's lower cash trades and a jump in feedgrain futures offset support from tight cattle supplies, traders said.

CME's benchmark August live cattle LCQ26 futures contract settled down 0.125 cent at 239.100 cents per pound while October cattle LCV26 closed up 0.350 cent at 234.650 cents.

CME August feeder cattle FCQ26 ended lower for a sixth straight session, falling 0.125 cent to settle at 360.500 cents per pound.

Prices surged for corn, a key feed ingredient, with Chicago Board of Trade most-active December corn CZ26 rising 3.7%, signaling higher feed costs. GRA/

Cash cattle traded last week at around $255 per hundredweight, the U.S. Department of Agriculture reported, down from around $259 one week earlier.

Meanwhile, wholesale beef prices eased, with choice cuts of beef priced on Monday afternoon at $386.48 per cwt, down 59 cents from Thursday. Select cuts of beef fell $1.56 to $365.87 per cwt, according to USDA data.

President Donald Trump said on Monday that Walmart would lower prices on a pound of ground beef by "almost" 15% after his administration made a request to coincide with the nation's 250th birthday.

In the hog market, CME August lean hog futures LHQ26 settled 0.225 cent lower at 98.525 cents per pound while October hogs LHV26 rose 0.550 cent to finish at 82.575 cents a pound.

The USDA priced the hog carcass cutout at $96.25 per cwt, up 19 cents from Thursday.