Enables growth hormone-releasing hormone activity. Acts upstream of or within signal transduction. Predicted to be located in extracellular region. Predicted to be active in extracellular space; perikaryon; and terminal bouton. Is expressed in brain and caudal parvocellular preoptic nucleus. Human ortholog(s) of this gene implicated in autoimmune polyendocrine syndrome type 1; endometrial cancer; ovarian cancer; and renal cell carcinoma. Orthologous to human GHRH (growth hormone releasing hormone).