Enables lactate transmembrane transporter activity; monocarboxylate:sodium symporter activity; and propionate transmembrane transporter activity. Acts upstream of or within propanoate transport and short-chain fatty acid import. Predicted to be located in brush border membrane. Is expressed in olfactory epithelium and rectum. Orthologous to human SLC5A8 (solute carrier family 5 member 8). [provided by Alliance of Genome Resources, Apr 2022]