* US soy end stocks 140 mln bu, 10 pct below estimate
* US corn end stocks 745 mln bu, 4 pct below estimate
* Corn and soybean prices jump to 2-1/2 year highs
* Agribusiness stocks soar on USDA report (Updates with explanation of supply decline in paragraph two)
By Russell Blinch
WASHINGTON, Jan 12 (Reuters) - America's stockpiles of corn and soybeans will be drawn down to uncomfortably thin levels this year, according to a government report on Wednesday that sent grain prices soaring and added to concerns over surging world food prices.
Dwindling stocks in the world's biggest food exporter -- depleted by strong ethanol demand and a sharp reduction in estimated corn and soy production last year -- and poor crops in other major exporting countries are setting up what could be one of the toughest years for food prices and supplies since 2008.
The market is drawing parallels with the tight supplies of that year and is concerned that runaway food prices could again lead to shortages and unrest in poor countries.
So far, there has has been nothing like the food riots seen two years ago.
The U.S. Department of Agriculture forecast that by the time next year's crop is ready for harvest in September stocks of soybeans will be just 140 million bushels, 10 percent below analyst expectations. Corn stocks will likely stand at 745 million bushels, 4 percent below trade forecasts and the smallest supply since 1995.
Both corn and soybeans touched their daily trading limits and hit 30-month highs on the Chicago Board of Trade after the surprising report. Soy was up more than 4.6 percent to $14.12 a bushel while corn was up 4.12 percent at $6.32-1/4 a bushel.
"These numbers are bullish numbers across the board," said Rich Nelson, an analyst with the brokerage Allendale Inc. "Most of the moves were made on production revisions and that should be a surprise to most of the trade."
Soaring grains sent livestock prices higher LCc1 as the rising cost of feeding animals was expected to crimp herd sizes and push up the cost of meat and dairy products.
CORN YIELDS TRIMMED
The U.S. Agriculture Department said the corn stocks-to-use ratio -- an important indicator of supply and demand -- was projected at 5.5 percent, the lowest since 1995-96 when it dropped to 5 percent. The ratio reflected USDA's lower yield estimates for last fall's harvest and higher ethanol use outlook.
The stocks-to-use ratio for soy was 4.2 percent, the lowest level since soybeans became a major crop for U.S. farmers, said Keith Menzie, an oilseeds analyst for the department's World Agricultural Outlook Board.
Stocks of U.S. soybeans totaled only 2.28 billion bushels as of Dec. 1, or 3 percent less than traders had expected, while the production forecast was 1.3 percent lower than expected by the market at 3.329 billion bushels.
"With our strong demand we shrunk our supply of corn and beans and consequently the market is racing higher to ration supplies," said Don Roose, analyst with U.S. Commodities.
US corn stocks-use ratio r.reuters.com/sec85r
Soybean end stocks r.reuters.com/sab85r
Corn end stocks r.reuters.com/tab85r
Wheat end stocks r.reuters.com/vab85r
Corn stocks at Dec 1 r.reuters.com/rec85r
Wheat stocks at Dec 1 r.reuters.com/pec85r
Soybean stocks at Dec 1 r.reuters.com/qec85r
Winter wheat seedings r.reuters.com/wab85r
Corn production, yield r.reuters.com/tec85r
Soybean production, yield r.reuters.com/vec85r
crop stock to use ratio r.reuters.com/pup95r
Return of the Food Crisis? link.reuters.com/tyq75r
Food price story not the same as 2008 [ID:nN11148019]
USDA said said Dec. 1 corn stocks also came in slightly lower than expected at 10.04 billion bushels, down 8 percent from a year ago and just below the 10.067 billion bushels on average expected by traders.
Wheat inventories at Dec. 1 were closer to expectations at 1.93 billion bushels, up 8 percent from a year ago.
The USDA boosted wheat exports because of brisk sales to date and reduced competition from flood-hit Australia.
It was also a big day for agribusiness companies on U.S. markets, with the fertilizer maker Potash Corp POT.TO POT.N up more than 2.6 percent and Monsanto MON.N up 3.5 percent. Tyson Foods (TSN.N), possibly facing higher feed costs in producing its meat products, fell more than 1 percent.
Cargill reported sharply higher earnings on Wednesday, helped by its fertilizer producer, Mosaic (MOS.N), which was up over 4 percent on the market.
BIG WHEAT PLANTINGS
The USDA released its first estimate of winter wheat plantings. At 40.99 million acres it represented a 10 percent increase over last year and reflected strong prices and good planting conditions.
Strong world demand led by China and one of the hottest years on record [ID:n N12197667] combined to diminish crop inventories globally in 2010. Concern is now mounting that output will be hurt further by bad weather in big producing countries such as Australia and Argentina this year.
The USDA has not yet forecast how many acres U.S. producers will plant to corn and soybeans this spring. But this year is off to a bad start in other parts of the world with searing heat in Argentina and floods in Australia darkening the outlook for their big harvests.
USDA cut its forecast of Argentina's soy production by 3 percent from last month and also cut Argentina's corn outlook, by 6 percent.
Australia's wheat crop outlook was trimmed by 2 percent from last month, and exports were forecast to decline 1.5 million tonnes as heavy rain and flooding reduced the quality of the harvest and further pressured world supplies and prices.
However, the USDA increased global 2010/11 wheat ending stocks slightly. Traders had expected a cut. (Additional reporting by Karl Plume in Chicago; editing by Roberta Rampton and Jim Marshall)