Enables cytokine activity and interleukin-3 receptor binding activity. Involved in several processes, including hemopoiesis; positive regulation of cell population proliferation; and regulation of cell growth. Located in extracellular space. Used to study osteosarcoma. Biomarker of prostatic hypertrophy and pyelonephritis. Human ortholog(s) of this gene implicated in Graves' disease; asthma; and rheumatoid arthritis. Orthologous to human IL3 (interleukin 3). [provided by Alliance of Genome Resources, Apr 2022]