Dealing with business of animal food which contains non Halal parts is permissible as far as you are sure that it will never be consumed by any human being and will be given to animals only.
According to many scholars, one should completely avoid serving alcohol and pork meat. Some other scholars such as Sayed Muhammad Shirazi, stated that one can serve pork only to non-Muslims. You would need to check this with your marja to see what their ruling is.
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