Enables interleukin-3 binding activity and interleukin-3 receptor activity. Acts upstream of or within interleukin-3-mediated signaling pathway; monocyte differentiation; and regulation of cell growth. Located in membrane. Is expressed in several structures, including cardiovascular system mesenchyme; dorsal aorta; early conceptus; genitourinary system; and umbilical or vitelline vessel. Orthologous to human IL3RA (interleukin 3 receptor subunit alpha). [provided by Alliance of Genome Resources, Apr 2022]