Q: If someone gets a job working as a chef can they cook meat and milk together if its not being eaten by the person, only others and assuming that the others aren’t Jewish.

A: It is prohibited to cook meat and milk even if the resulting product will not be consumed at all, as in an analytical lab test, or if it will only used for animal feed. (Yalkut Yosef 3 pg.197). Our tradition is to prohibit cooking non-kosher nevaila meat (that did not undergo proper shechita), However, this does not apply to meat from a non-kosher species. (see Shulchan Aruch YD 8,3 and 4 – Taz and Shach ibid.)

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a