Enables inhibin binding activity. Involved in male gonad development; negative regulation of follicle-stimulating hormone secretion; and ovarian follicle development. Located in several cellular components, including neuronal cell body; photoreceptor inner segment; and photoreceptor outer segment. Part of inhibin A complex and inhibin B complex. Biomarker of Leydig cell tumor. Human ortholog(s) of this gene implicated in prostate carcinoma. Orthologous to human INHA (inhibin subunit alpha). [provided by Alliance of Genome Resources, Apr 2022]