Enables 2-acylglycerol O-acyltransferase activity and diacylglycerol O-acyltransferase activity. Involved in several processes, including acylglycerol metabolic process; fatty acid homeostasis; and long-chain fatty-acyl-CoA metabolic process. Located in intracellular membrane-bounded organelle and membrane. Is integral component of membrane. Is expressed in several structures, including brain; genitourinary system; integument; liver; and yolk sac. Human ortholog(s) of this gene implicated in cardiomyopathy and congenital diarrhea 7 with exudative enteropathy. Orthologous to human DGAT1 (diacylglycerol O-acyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]