Generally, no. Downers are a loss. In fact, to avoid accusations of profiting from cruelty, downers just sit, suffering, until a vet can come and euthanize it. A bit wasteful, and quite the opposite of merciful, I’ll be first to agree, but you can see how people just don’t want to do anything suspicious – i.e. “I’m totes sure it fell, just fell. No hidden disease here. We just won’t eat that bit.” Naw. Not a thing.
In Connecticut for example, any animal that dies suspiciously has to be autopsied. And no, you can’t get a few choice bits or some sausage out of what’s left post autopsy.
Halal and Kosher butchering slice a major vein and bleed the animal out because tradition dictated that procedure was the least cruel way to do it without causing the animal to suffer, compared to other traditional methods – i.e. strangulation. The fact that in the intervening centuries, we’ve developed stunning techniques that are even more humane doesn’t change religious tradition. And bleeding out from the uterus definitely sounds like an animal suffering, mechanism similarity notwithstanding. I’d assume strict Jews and Muslims would be quite insulted if you said, “Pfft. It bled out, who cares from which end. Same ju-ju sky wizard dealie.”