Enables DNA nucleotidylexotransferase activity. Acts upstream of or within DNA metabolic process. Predicted to be located in cytosol and nucleoplasm. Predicted to be active in nucleus. Is expressed in bone marrow; ovary; submandibular gland; testis; and thymus. Orthologous to human DNTT (DNA nucleotidylexotransferase). [provided by Alliance of Genome Resources, Apr 2022]