I don't know what the popular breeds are there in Peru but most people keep Californians, New Zealand's, Florida whites, Satins, Flemish Giants or many cross breeds of those varieties. I keep a Californian buck and a Satin doe along with some hybrids. They average a litter of about 8 kits which reach fryer size (5.5 lbs) at about eight weeks old.
The only real way to know how much potential a rabbit has is to wait til it's gotten at least 4 months old. By then the front end has filled out a bit and you'll have a good idea about how much meat to expect. In this case you'll want to feel the rabbits muscles to determine how much meat there is compared to bone. It takes some practice to figure out but once you do it becomes second nature. Ideally you'll have an opportunity to get some juvenile rabbits from a breeder who raises meat rabbits. In this case you'll be able to see the parents. A general rule is that you'll want a long bodied doe to breed with a blocky meaty buck. This usually produces kits with both beneficial traits. You'll end up with longer meatier kits.
If you have to get them from pet stores I would think about asking the store manager if they could give you the name of their supplier. Can't hurt to ask. Just say that you're interested in buying older rabbits. Also make sure that if you do get them from a store that they are not related rabbits. Many
local stores could be getting their rabbits from the same breeder and you might end up with closely related animals. That's not always a bad thing but you'll still want to know.
I'm still working on my first cup of
coffee so I'm sorry if that's a little rambling.
best of luck