From Creatures Wikia
The Breeding limit is a limit on the number of norns that can be naturally born into a world. It is placed on a world by the engine, so it can be altered by cobs or by agents. However, in altering the breeding limit, both the food sources and space of the world, and your processor speed should be taken into account.
In C1, the import limit is 8, and the breeding limit is 12.
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