I don't know anything about quail, but I did raise rabbits for 10 years so here's my two cents on them:
How often can they be bred?
You can breed them about 2 weeks before the kits are weaned if you really wanted to, but personally I wait till the kits are ready to leave the mother at 4-5 weeks and give her a couple of weeks at least to rest. If you can give her longer, I prefer to do that and breed other does and focus on them. I've personally have had better luck if I can allow a mother rabbit to rest at least a month after weaning and between litters. Others may well disagree with me, but that's my personal experience. I like to treat my food kindly, especially if they are my best breeders that I want to keep around a few years.
You can breed them about 2 weeks before the kits are weaned if you really wanted to, but personally I wait till the kits are ready to leave the mother at 4-5 weeks and give her a couple of weeks at least to rest. If you can give her longer, I prefer to do that and breed other does and focus on them. I've personally have had better luck if I can allow a mother rabbit to rest at least a month after weaning and between litters. Others may well disagree with me, but that's my personal experience. I like to treat my food kindly, especially if they are my best breeders that I want to keep around a few years.

Getting a breeding pair seems to be pricey
It is, but if you want to breed good quality meat, then you MUST start with good base stock. Personally, of everything you need, I think this is the most important part to invest in.
It is, but if you want to breed good quality meat, then you MUST start with good base stock. Personally, of everything you need, I think this is the most important part to invest in.
Same question....can they eat corn & other grains, or must I buy rabbit pellets
Do NOT feed rabbits corn or grains. It's not good for them, and they don't digest them well. Feed them good quality rabbit pellets, hay, fresh vegetables, dandelion leaves, and grass (none that's been sprayed, of course).
Do NOT feed rabbits corn or grains. It's not good for them, and they don't digest them well. Feed them good quality rabbit pellets, hay, fresh vegetables, dandelion leaves, and grass (none that's been sprayed, of course).
Do those raising for meat let them have ground space to exercise?
It makes for happier bunnies, no. They DO need adequate cage space, and you need to keep the bucks and does seperate (to the point of making sure that the boy's and girl's cages are not touching because they will mate through the wire!).
Pregnant and nursing mothers will need their own cages at least. You can cohabit rabbits of the same sex, but again, you'd need a big cage for that or they will fight.
As for weather, rabbits are really cold hardy, but not so much with heat.
Also, be aware that it's not uncommon for first time rabbit mothers to lose their first litters because they don't know what to do or they will kill them. But then they do fine the second time around.
Also, rabbit mothers NEED to be kept as stress free, quiet, and safe as possible. They will abort, re-absorb, or abandon their kits if they are stressed out.
It makes for happier bunnies, no. They DO need adequate cage space, and you need to keep the bucks and does seperate (to the point of making sure that the boy's and girl's cages are not touching because they will mate through the wire!).
Pregnant and nursing mothers will need their own cages at least. You can cohabit rabbits of the same sex, but again, you'd need a big cage for that or they will fight.
As for weather, rabbits are really cold hardy, but not so much with heat.
Also, be aware that it's not uncommon for first time rabbit mothers to lose their first litters because they don't know what to do or they will kill them. But then they do fine the second time around.
Also, rabbit mothers NEED to be kept as stress free, quiet, and safe as possible. They will abort, re-absorb, or abandon their kits if they are stressed out.