Animals are no longer used for epinephrine production. If we still did this, it would be pretty harmful to the animals and the environment. I imagine we would not use the same animals used for food. They would be raised in labs. If there was a use for other organs, we might keep those but most of the animal would be incinerated. BUT! that's not happening anymore. The precursors are just mixed together and probably there's some heating and maybe some refluxing and some form of purification. No animals necessary. That's way too expensive and wasteful.