It will not produce any offspring. Cottontails are from the genus Sylvilagus. Your rabbits are genus Oryctolagus. You will be taking a huge risk by introducing a wild rabbit to your doe as it may be carrying disease, (potentially even hemorrhagic disease) or parasites. You will also be needlessly stressing a wild animal by capturing it and temporarily forcing it into captivity. The rabbits may injure each other. And there is no possibility that even a successful breeding would result in offspring. There is absolutely no benefit to this plan.Lol srry its been awhile about my breeds of bunnies. But I'm gonna at least try the cotton tail with my doe probably next yr cause she'll be 6 mths old in August