It is processed by generating a formula where the ingredients are balanced using the Pearson's Square Mathematical model and the accepted formula used to weigh the feed the to know the percentage of each ingredient to be mixed.The maker or provider of the feeds is the lucky businessman. All rely on his feeds. Maybe there is a machine or the right chemicals mixer. I am going to research how animal feeds are processed. It could be good to have this as our submission under the TUTORIAL category. I submitted one tutorial but it was junked