We understand that it is totally prohibited within the same animal species and not only for protein, but for all slaughterhouse by-products. Therefore, tallow cannot be used in ruminants, lard cannot 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 …