Animal by-products are defined as carcases, parts of carcases or products of animal origin, which are not intended for human consumption, but the definition excludes catering waste and excreta. Animal by-products are divided into two categories: high risk and low risk. Part II of the Order requires that animal by-products as defined in Part I must be disposed of, without undue delay by specified methods. The Order requires persons who engage in the business of collection, holding or removal of animal by-products to register with the Department and requires certain records to be kept. Part III of the Order prohibits the feeding to livestock of catering waste (other than used cooking oil) which contains, or has been in contact with animal carcases, parts of animal carcases or products of animal origin. It also regulates the holding, disposal and transport of catering waste and the landing of catering waste in Northern Ireland from a means of transport from outside Northern Ireland. Part IV of the Order makes provision for the service of notices requiring animal by-products or catering waste to be disposed of, and for the cleansing and disinfection of vehicles and the keeping of records.