KKR & Co LP said on Sunday it had decided to terminate a hedge fund that invested in stocks which the private equity firm had launched in 2011 after poaching a team of proprietary traders from investment bank Goldman Sachs Group Inc. The move shows some of the challenges that alternative asset managers still face in capitalizing on the retrenchment of banks from some investment activities that regulators and lawmakers cracked down on in the aftermath of the 2008 financial crisis.