That they would be reserved for nobility seems like it must be wrong. These are tiny animals that wouldn’t take much effort to raise. A small family could easily eat one. Just grab a pair and start raising them.
It’s not like a cow where you need large amounts of grazing land and then when you kill it, you have huge amounts of meat to deal with.
This is why animals in English have three names. One for the animal, raised by the commoners with Germanic origin (cow). One for the meat, eaten by the wealthy with French origin due to the Norman conquest (beef). And one used in scientific contexts coming from Greek or Latin (bovine)