Freddie Mac reported slumping earnings for 2005 and offered new details about its growing retained portfolio – including the possibility that the Office of Federal Housing Enterprise Oversight could impose a cap on the company’s massive retained investments.During an earnings call with analysts this week, Freddie officials said that OFHEO is considering further regulatory constraints on the government-sponsored enterprise in light of the agency’s recent settlement agreement with Fannie Mae. In recommendations made in the agency’s special report on Fannie Mae, staff said OFHEO should consider applying “remedial actions” imposed on Fannie Mae to Freddie Mac as well...