No milk drippings, milk rinsings, mixtures or whey in fluid, concentrated liquid or semiliquid form which is to be used for feeding of domestic animals shall be removed from any butter factory, cheese factory or other milk plant or shall be used for such purpose unless uniformly heated to a temperature of not less than 143 degrees Fahrenheit and held at such temperature for at least 30 minutes, or unless uniformly heated to a temperature of 170 degrees Fahrenheit. (See Agriculture and Markets Law, section 55.)