Also, if the vampires were trying to keep animals alive, they would suck at it.
Why would vampires put themselves in charge of keeping the animals alive? It's been established that the Cullens have staggering amounts of money. Just find a small, publicly-traded company that does something related to what you're looking for, and buy up a controlling share of the stock. Make some unreasonable demands, ratchet up relevant salaries until those demands start sounding very reasonable indeed, then add layer after layer of nondisclosure agreements just in case. Once it's set up, you never need to visit again. They mail the packaged, refrigerated blood to an entirely separate institution whose sole purpose, in this context at least, is to keep track of your forwarding address.
Routine problems can be handled by professional investigators of the appropriate sort (would Temple Grandin qualify as a witch in this setting?) and severe/bizarre/supernatural problems can be handled by divesting yourself of the shares, starting over from scratch with a different company, and leaving just enough lawyers in your wake to remind those involved that the nondisclosure agreement still applies.
As often as necessary, packages of animal blood arrive in the mail. If someone notices, you mumble something about medical research; if they call you on it, explain in shameful tones that your spouse has a weird fetish, you found a company that sells the stuff, all very humane, it's expensive but who can put a price on a happy marriage, and (depending on how the situation develops) follow up with either an indignant rant about the rights of consenting adults within the privacy of their own home, or pleading and an appropriate bribe.
I've stated elsewhere under this post that I've ruled that animal blood is impossible to tolerate when it isn't fresh. This is to explain the canon fact that the Cullens do not keep any preserved animal blood in their home, which would make immense sense if it were drinkable that way.
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)