Jan 22 (Reuters) - Canada's main stock index fell at open on Tuesday, following a 12-day long rally, with energy shares leading losses on the back of lower oil prices.
* At 9:30 a.m. ET (14:30 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 77.86 points, or 0.51 percent, at 15,276.3.