Birla Group hikes stakes in Canadian ventureBS Reporter / Mumbai April 14, 2008Aditya Birla Group has bought additional 20 per cent stake in its two Canadian joint venture companies from partner Tembec Group for around Canadian $9 million (Rs 35 crore). The group's flagship company Grasim has hiked stake from 25 per cent to 45 per cent in Canadian firm AV Cell Inc, while Bharat Rayon Indonesia has acquired additional 20 per cent holding in AV Nackawic.The company said in a release that Tembec Group