By Alastair Sharp TORONTO (Reuters) – Canada’s main stock index slipped on Friday, with energy companies among the leading weights as driller Canadian Oil Sands said unexpected maintenance could hurt its output. The energy sector in Canada has performed well in recent weeks, seemingly boosted by the geopolitical tensions in Ukraine that could limit the availability of Russian commodity exports to Western markets. “The overall scare of the conflict is really weighing on the market,” said Marcus Xu, a portfolio manager at MY Capital Management Corp in Vancouver. But the Canadian market seems to be holding up pretty well.” The Toronto Stock Exchange’s S&P/TSX composite index ended the day down 20.68 points, or 0.14 percent, at 14,533.57.