They forgot to mention roadkill and veterinary medical waste on that list. Or maybe including roadkill and so-called "4-D meats" (dead, dying, disabled, diseased) in rendered animal products is just a US specialty...
Or maybe not... Just found this on rendered meat in the UK (note that this is from 1986, so hopefully things have changed?):
"In 1986, the material processed by renderers mostly came from slaughterhouses, and consisted of the parts of animals that were unsuitable for food or that people in the UK chose not to eat, such as:
- offal that did not have any more valuable use, such as the bladder, diaphragm and udder, as well as some intestines, kidneys, spleen, blood, stomach, heart, liver and lungs, which were only occasionally used for other purposes;
- the head, hooves, bones and tails;
- edible fat; and
- carcasses condemned as unfit.
Material from other sources accounted for 10 per cent or less of the raw materials used by renderers. This included:
- whole carcasses of fallen stock from farms, kennels, veterinary sources (pets), and zoo animals such as antelope or giraffe; and
- waste from knacker's yards, and from other animal by-product trades such as hunt kennels, maggot bait farms, tripe dressers and tanneries.
In addition, renderers received waste fat and bones from butcher's shops, from food factories, and from boning-out and pre-packing operations supplying supermarkets."
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