Just as a side point - I saw an Animal Planet episode on venomous animals.
They pointed out that most snake-venom antivenom compounds are derived from horse blood after dosing the horse with continuous small amounts of the actual venom. This develops specific anti-bodies to the poison.
It reminded me that there was a big deal over the polio vaccine back when I was a JW kid - many local JWs bought into a rumor that it was somehow made from blood.
They pretty much put out the news on the local back channels that is wasn't really made from blood after all.
By witness logic, I suppose that they could eventually make the case that blood sausage is not really "whole blood" because a lot of the volatile elements get cooked out when it is made.