UPDATE 1-Speculators' net long bets on U.S. dollar slip to 21-week low -CFTC, Reuters

(Adds table, details, background) By Saqib Iqbal Ahmed NEW YORK, Jan 28 (Reuters) - Speculators' net long bets on the U.S. dollar fell to a 21-week low in the latest week, according to calculations by Reuters and U.S. Commodity Futures Trading Commission data released on Friday. The value of the net long dollar position was $9.87 billion for the week ended Jan. 25, compared with a net long position of $12.59 billion for the prior week. U.S. dollar positioning was derived from net contracts of International Monetary Market speculators in the Japanese yen, euro, British pound, Swiss franc, and Canadian and Australian dollars. In a wider measure of dollar positioning that includes net contracts on the New Zealand dollar, Mexican peso, Brazilian real and Russian rouble, the greenback posted a net long of $10.71 billion, down from $13.03 billion a week earlier. The dollar which rose 6.3% against a basket of currencies in 2021, came under some selling pressure at the turn of year as investors fretted that much of the good news that had driven the rally in the U.S. currency was already priced in. The dollar has recovered since then, helped by rising rate hike expectations and surging Treasury yields. On Friday, the dollar index was up more than 1% for the year. Japanese Yen (Contracts of 12,500,000 yen) $7.495 billion 25 Jan 2022 Prior week week Long 15,866 8,002 Short 84,139 88,881 Net -68,273 -80,879 EURO (Contracts of 125,000 euros) $-4.457 billion 25 Jan 2022 Prior week week Long 213,408 211,901 Short 181,848 187,317 Net 31,560 24,584 POUND STERLING (Contracts of 62,500 pounds sterling) $0.655 billion 25 Jan 2022 Prior week week Long 36,666 39,760 Short 44,429 40,007 Net -7,763 -247 SWISS FRANC (Contracts of 125,000 Swiss francs) $1.198 billion 25 Jan 2022 Prior week week Long 1,999 925 Short 10,795 11,735 Net -8,796 -10,810 CANADIAN DOLLAR (Contracts of 100,000 Canadian dollars) $-0.975 billion 25 Jan 2022 Prior week week Long 53,129 49,792 Short 40,812 42,300 Net 12,317 7,492 AUSTRALIAN DOLLAR (Contracts of 100,000 Aussie dollars) $5.952 billion 25 Jan 2022 Prior week week Long 15,121 9,051 Short 98,394 97,505 Net -83,273 -88,454 MEXICAN PESO (Contracts of 500,000 pesos) $0.019 billion 25 Jan 2022 Prior week week Long 66,449 75,461 Short 67,239 70,541 Net -790 4,920 NEW ZEALAND DOLLAR (Contracts of 100,000 New Zealand dollars) $0.72 billion 25 Jan 2022 Prior week week Long 15,948 11,612 Short 26,721 19,943 Net -10,773 -8,331 (Reporting by Saqib Iqbal Ahmed Editing by Marguerita Choy)