(Reuters) - ICE cotton futures turned negative to slide as much as 4% on Wednesday, after the U.S. Department of Agriculture (USDA) in its monthly report showed bigger-than-expected U.S. production and lower global demand estimates.

Cotton contracts for December fell 1.5 cent, or 1.7%, to 86.18 cents per lb at 1310 ET (1810 GMT) having shed as much as 4% at 84.19 cents a lb after USDA’s monthly World Agricultural and Supply Demand Estimates (WASDE) report.

“All in all, this report is trying to show the current reality of the market, both on the supply and the demand side, with the latter being the one that could come back at any point, unlike production,” said Valentin Olah, cotton risk management consultant at StoneX Group.

The USDA report saw U.S. ending stocks 200,000 bales higher at 3 million bales, which Olah said was surprising and “softens a bit the tightness of ending stocks, for now.”

“Production (in the U.S.) is 1.5% higher, at 14.0 million bales, as a decrease in the Southwest is more than offset by increases elsewhere,” the WASDE report said.

The report dealt a second blow to prices by cutting global consumption estimates, seeing fewer cotton shipments to major importers Bangladesh and China.

USDA also slashed its forecast for the world’s cotton output by 1.6 million bales, citing a diminished crop due to unusually heavy rainfall in Pakistan, Australia and West Africa.

The dollar advanced against several major currencies, making U.S. cotton more expensive for overseas buyers.

Reporting by Deep Vakil in Bengaluru; Editing by Shailesh Kuber