Enables cysteine dioxygenase activity and ferrous iron binding activity. Involved in several processes, including L-cysteine catabolic process; lactation; and response to glucagon. Predicted to be located in cytosol. Biomarker of hypertension. Orthologous to human CDO1 (cysteine dioxygenase type 1). [provided by Alliance of Genome Resources, Apr 2022]