That will probably be fine. English Spots are small but they're a normally particularly active breed, so I'd just be careful to watch for signs of stress in does with litters, in case you find that they need a bigger space. Overcrowded animals tend to have health and/or behavioral problems. You might ask the breeder you're going to buy the rabbits from what his/her experience has been.
Below are two charts from the ARBA (
ARBA Recommendations for the Care of Rabbits and Cavies) describing the minimum cage size according to the Animal Welfare Act, based upon each breed’s maximum senior weight (rabbit at mature size), which includes a note that individual animals may be housed in smaller cages based on their weight. The running breeds have asterisks because their activity level makes a difference to comfortable cage size. I've observed that having cages taller than 14" is nicer for both rabbits and humans, but these are minimums, of course. Your 24 x 24 cages more than meet the minimum guidelines for individual rabbits (Chart 1-B), so I wouldn't worry about using them unless you see signs of distress in the rabbits. They do fall a bit short of the recommendation for does with litters (Chart 1-C). I don't necessarily follow official guidelines slavishly, but they are a start; more important to me is the health and behavior of the animals themselves. One size doesn't fit all (no pun intended
).
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It appears that Tractor Supply also sells a 30 x 30" cage and a 30 x 30" tray, and you can buy both for the same price as the one you're looking at; you'd just need to add a $17.99 cage support kit to make it stackable. Perhaps it would be possible to get a couple of those for your brood does to start with.
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