Predicted to enable UDP-galactose:glucosylceramide beta-1,4-galactosyltransferase activity. Predicted to be involved in glycoprotein biosynthetic process and glycosylation. Predicted to act upstream of or within carbohydrate metabolic process and protein glycosylation. Predicted to be located in Golgi cisterna membrane and Golgi membrane. Predicted to be active in Golgi apparatus. Orthologous to human B4GALT5 (beta-1,4-galactosyltransferase 5).