Predicted to enable UDP-glycosyltransferase activity. Predicted to be involved in poly-N-acetyllactosamine biosynthetic process and protein O-linked glycosylation. Predicted to act upstream of or within protein glycosylation. Predicted to be located in Golgi apparatus and membrane. Predicted to be active in Golgi membrane. Orthologous to human B3GNT3 (UDP-GlcNAc:betaGal beta-1,3-N-acetylglucosaminyltransferase 3).