Enables alpha1-adrenergic receptor activity. Involved in several processes, including positive regulation of cytosolic calcium ion concentration; response to estrogen; and response to steroid hormone. Acts upstream of or within negative regulation of Rho protein signal transduction. Located in T-tubule and intercalated disc. Biomarker of polycystic ovary syndrome. Orthologous to human ADRA1B (adrenoceptor alpha 1B). [provided by Alliance of Genome Resources, Apr 2022]