GRAINS-Soybeans, corn hit 6-week lows on record U.S. crop prospects

* Soy sags after Pro Farmer projects record U.S. crop

* Disease in China's hog herd threatens to curb feed demand

* Wheat heads lower for sixth straight session

(Recasts; updates prices, adds quotes, changes byline, changes dateline from previous PARIS/SINGAPORE) CHICAGO, Aug 27 (Reuters) - U.S. soybean and corn futures fell to six-week lows Monday on expectations of large U.S. crops and fears that hog disease in China might hurt demand for feed, analysts said. Chicago Board of Trade wheat futures also declined, sliding for a sixth session on lackluster demand for U.S. supplies and easing concerns about tightening global stocks. As of 12:51 p.m. CDT (1751 GMT), CBOT November soybeans were down 8 cents at $8.47-1/4 a bushel after dipping to $8.38-1/4, the contract's lowest since July 16. CBOT December corn was down 2-1/2 cents at $3.60-1/4 a bushel after touching $3.57-1/2, its lowest since mid-July. CBOT December wheat was down 14 cents at $5.22-1/2 after scraping $5.22, its lowest since July 20. Soybean futures were on the defensive after the Pro Farmer advisory service on Friday projected 2018 U.S. soybean production at a record 4.683 billion bushels, topping the U.S. Department of Agriculture's forecast of a 4.586 billion-bushel crop. Also bearish were fears that outbreaks of African swine fever in China may reduce demand for feed, including soymeal, a key source of protein in hog and poultry feed. China is home to the world's largest pig herd. "I think this African swine fever is a concern," said Don Roose, analyst with Iowa-based U.S. Commodities, noting that soymeal futures on China's Dalian Commodity Exchange fell nearly 2 percent overnight. Roose said the approaching U.S. harvest added to bearish sentiment, along with weakening cash basis levels in the interior Midwest. Grain handlers there are bracing for a huge soy crop at a time when trade disputes have stalled export demand from top buyer China. Traders awaited details from the USDA, due later on Monday, about a planned $12 billion aid package to compensate farmers for an estimated $11 billion in losses resulting from trade disputes with other countries. Corn followed soybeans lower, as Pro Farmer projected a U.S. corn yield of 177.3 bushels per acre, below the USDA's forecast of 178.4 but still a record high, if realized. CBOT wheat slid on weak demand for U.S. cargoes, along with easing concerns about Black Sea supplies. Russian wheat export prices fell last week with CBOT wheat and because of a weaker rouble, analysts said. Also, the Ukrainian agriculture ministry has no immediate plan to review a memorandum agreed with traders this month allowing for the export of 8 million tonnes of milling wheat this season, a senior ministry official said. "The market needs more bullish news - such as a pick-up in U.S. exports - to rise," said Phin Ziebell, agribusiness economist at National Australia Bank.

CBOT prices as of 12:50 p.m. CDT (1750 GMT):

Net Pct Volume

Last change change

CBOT wheat WZ8 522.50 -14.00 -2.6 66177 CBOT corn CZ8 360.25 -2.50 -0.7 141405 CBOT soybeans SX8 847.00 -8.25 -1.0 115882 CBOT soymeal SMZ8 310.30 -6.00 -1.9 54092 CBOT soyoil BOZ8 28.76 0.27 1.0 51981

NOTE: CBOT December wheat and corn and November soybeans shown in cents per bushel, December soymeal in dollars per short ton and December soyoil in cents per lb.

(Reporting by Naveen Thukral and Sybille de La Hamaide; editing