Tanners require the raw hide complete with fat. They would also prefer that pigs be slaughtered electrically, but unfortunately, consumers dislike pork produced in this way.
張赫如指出，如果毛豬要剝皮，最好採取電宰，因為人工剝皮不但費時費事，且容易傷及皮面，很難剝得厚度均勻。