Enables polypeptide N-acetylgalactosaminyltransferase activity. Predicted to be located in perinuclear region of cytoplasm. Predicted to be active in Golgi apparatus. Is expressed in cervical ganglion; cervico-thoracic ganglion; and thoracic ganglion. Orthologous to human GALNT6 (polypeptide N-acetylgalactosaminyltransferase 6). [provided by Alliance of Genome Resources, Apr 2022]