@Goldenzeal I appreciate the trivia, I was unaware that eggs have to be in cold-storage for long-distance transporting.
In the part of my country, we have plenty of sources of chickens being raised and slaughtered, so we've never had any issue with finding eggs in the stores, etc, and can even drive to a local farm that has chickens and buy eggs directly from the farmers themselves if we so wish to. So that information you provided was news to me ^^
@zadzad Also thank you, too, though I don't particularly like spoilers, that tidbit is something I don't mind. It's interesting to know that authors of fantasy writing bother to think of such things as cooling and such ^^
As for the mangas I was referring to, they never mentioned anything about diseases or storage methods, they only mentioned that the village doesn't have any chickens in it, so they have to import eggs from other villages. The only issue with this, however, being that during transport, the merchant's wagons could often end up being sacked by bandits and/or monsters, and thus the price for eggs in that village would be more expensive than the price for the eggs in the exporting village.