Michigan Compiled Laws, Chapter 289. Pure Foods and Standards § 289.7125

(a) Ground lamb shall consist of comminuted fresh lamb meat, with or without added lamb fat, and shall not contain more than 25% fat.

(b) Ground poultry shall consist of comminuted fresh poultry meat, with or without accompanying skin in natural proportions, with or without added poultry fat, and shall not contain more than 20% fat. The name shall be identified by the species contained in the product.

(c) Ground poultry meat shall consist of comminuted fresh poultry meat, with or without added poultry fat, and shall not contain more than 15% fat. The name shall be identified by the species contained in the product.

(d) Ground veal shall consist of comminuted fresh veal meat, with or without added veal fat, and shall not contain more than 20% fat.

(e) Ground pork shall consist of comminuted fresh pork with or without the addition of pork fat as such and shall not contain more than 30% fat. Ground pork shall not contain extenders, binders, variety meats, by-products, added water or ice, artificial flavor or color, vegetable coloring, chemical preservative, boric acid or borates, sulphites, sulfur dioxide, or sulphurous acid. No other parts of the animal or any other substance is permitted in ground pork.