If you recall Richard, you and me used insulin made from animals for the first chunks of our lives, at least until recombinant insulin became available in the 1980's. We didn't make the insulin from pork and beef pancreases ourselves, we let Lilly do that in Indianapolis (importantly, near Chicago a big cross-shipping point for meat trades).
I grew up in the Midwest near many meat packing plants (anywhere where important rail lines intersected had a lot of this industry) and the relation between the meat industry and insulin production was very prominent in local public relations advertising for the meat packing plants.
http://www.diabetesforecast.org/2013/jul/making-insulin.html
http://americanhistory.si.edu/blog/2013/11/two-tons-of-pig-parts-ma...
I myself used the animal-source insulins until the late 90's, and I don't think they were discontinued by Lilly until like 2005. They may still be available from some other sources.