It isn't so much the size of the tub, it's how well ASFs do in certain numbers.
To start a good breeding colony you want a 1.2 to 1.4 group. I've noticed that any more than 4 females to the male and you won't get much production out of them.
If you want to use it as a grow out tub you can put a lot more than that in there as the babies wean. Just remember, once they are old enough to breed and females start having babies, if there is more than one male in that tub, the babies will be eaten.
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