If yall had a rendering plant, yall was uptown folks.
I never heard of a rendering plant until Conagra built a chicken processing plant in El Dorado, Ar. They had a rendering plant down the hill from the processing plant. All the chicken byproducts went to the rendering plant. There it was cooked and made into a grainule. Then it was hauled to the feed plant where it was sprayed with a chemical solution that had all the nutrients, vitamins, etc. that a chicken needed. Then hauled back to the chicken houses for feed.
That is the only rendering plant I've ever heard of.
Oh yeah, that rendering plant stunk... very, very bad!