Enables several functions, including L-lactate dehydrogenase activity; NAD binding activity; and identical protein binding activity. Involved in several processes, including response to cAMP; response to estrogen; and response to glucose. Predicted to be located in cytosol and sperm fibrous sheath. Biomarker of hyperglycemia. Orthologous to human LDHA (lactate dehydrogenase A). [provided by Alliance of Genome Resources, Apr 2022]