
…and sheep and cows.
This is entirely frivolous, because I felt like being a bit silly.
Hogwarts students write on parchment. Parchment, as we know, is made from the skins of goats, sheep, or cows. Between all the essays, star charts, and notes they take, the average Hogwarts student probably goes through five to ten feet of parchment per week at minimum (Hermione no doubt goes through twenty or thirty). There are perhaps 300 to 600 students, or maybe 200 or 1,000, because oh dear maths. If we take the 300 number, then Hogwarts students probably go through 1,500 to 3,000 feet of parchment per week.
Now, I don’t know how many feet of parchment you can get out of the average goat or cow, but I’m guessing that means at least a few hundred animals per week must die for these essays. Do the cows go into shepherd’s pie for Hogwarts dinners, I wonder? The remainder into a Hogsmeade butcher shop?
But there’s another factor to consider: what are their books made out of? Paper did quickly take over as the primary material in the early days of printing, true, but some of the Gutenberg Bibles were printed on parchment. Do wizards make children write on parchment for tradition and print on paper (maybe with the exception of important official documents like Ministry decrees; Parliament still prints acts on parchment)? One hopes so. Because even with a lively used book trade, a fair number of students still seem to buy new books, and Flourish & Blott’s obviously sells a fair number of new books (some of their stock may be used, but who knows). We know new books get added to the Hogwarts curriculum every so often, and it’s unlikely that Flourish & Blott’s had a hundred or more used copies of The Monster Book of Monsters just lying around. We also know that Lockhart’s books are best sellers, which means that each book probably sold at least a few hundred copies before three hundred or so Hogwarts students got assigned seven of his books each. Unless every adult witch and wizard sold their copies back, that means a couple thousand more books printed. We don’t know the page count of any of the books, but it must be at least a couple dozen animal skins per book. Lockhart’s books alone would probably account for enough dead cows and goats to feed wizarding Britain for a year.
So where are all these goats and cows grazing? Do they rustle them from Muggle herds? That sounds like a lot of work, not to mention risky to keep up long term. Are they filling the next ten valleys over from Hogwarts, tended by House Elf cowboys and goatherds? When there is leftover meat, do they Vanish it? Put it in stasis for emergencies? Send it to Romania for the dragons? What do they feed them during the winter - grass made by multiplying the last summer grass for months on end? (If the first principal exception to Gamp's law of elemental transfiguration applies to materials any animal could eat rather than just human food, then you can't create animal feed from nothing. Or thistles, tin cans, or three red shirts right off the line, for that matter.)
And is Aberforth a secret animal rights activist, saving goats from being made into copies of Magical Me?