Predicted to enable hormone activity and prolactin receptor binding activity. Acts upstream of or within several processes, including mammary gland development; maternal behavior; and positive regulation of receptor signaling pathway via JAK-STAT. Located in secretory granule. Is expressed in hippocampus; pituitary gland; placenta; and trophoblast giant cell. Human ortholog(s) of this gene implicated in carotid artery disease. Orthologous to human PRL (prolactin). [provided by Alliance of Genome Resources, Apr 2022]