Still, the net long, at its third biggest on record, "remains very large, despite some liquidation having occurred in the past fortnight", said Tobin Gorey, at Commonwealth Bank of Australia.

With the US Department of Agriculture on Friday, in initial forecasts for world cotton supply and demand in 2017-18, seeing stocks outside China on the rise "international prices may come under modest pressure", Mr Gorey added.

However, Dr John Robinson, of Texas A&M University's department of agricultural economics, flagged idea of support from an imbalance between mills' unhedged purchases of cotton, and unhedged purchases from suppliers.

"One theory about why the hedge funds are maintaining an historically large position is that they are anticipating the buying that must accompany expected mill [price] fixations on the spring 2017 contracts," Mr Robinson said.

'Excellent weight gains'

By contrast, in New York cocoa, hedge funds were net buyers for the first time since November, ending an 11-week selling spree which was the longest on data going back to 2006, and had driven the net short to a record high.

The selling had driven the net short in cocoa to the high.

However, in the livestock sector, hedge funds extended a decline in their net long in Chicago live cattle futures and options, amid some confidence in levels of beef supplies.

"Concerns about beef or cattle supply and demand changes in upcoming weeks are not in evidence as the Lenten season approaches," said Paragon Economics and Steiner Consulting.

"February weather has been spring-like in major cattle feeding regions, which should abet excellent weight gains for cattle in feedlots."