We understand that it is totally forbidden within the same animal species and not only for the protein, but for all slaughterhouse by-products. Therefore, sebum can not be used in ruminants, lard can not be used in pigs, etc. According to the European Commission http://europa.eu/rapid/press-release_MEMO-04-107_en.pdf MEMO / 04/107 Brussels, 6 May 2004 QUESTIONS And Answers on animal by-products Intra-species ...