The maker of pet foods and food pantry staples was acquired last March by an investor group led by funds affiliated with Kohlberg Kravis Roberts & Co. LP, Vestar Capital Partners and Centerview Capital LP. For the quarter ended Jan. 29, Del Monte Foods reported a profit of $28.6 million, down from $87.1 million a year earlier. The latest period included $62.8 million in interest expense, up from $18.8 million a year earlier.