NEW YORK--(BUSINESS WIRE)--Western Asset Mortgage Defined Opportunity Fund Inc. (NYSE:DMO) announces its portfolio composition as of June 30, 2015. Investment Objectives: The Fund’s primary investment objective is to provide current income. As a secondary investment objective, the Fund will seek capital appreciation. Investment Strategy: The Fund seeks to achieve its investment objectives by investing primarily in a diverse portfolio of mortgage-backed securities (“MBS”) consisting primarily of