Genetics and feeding are the most important things in growth.
It is possible, though, that when an animal feels "traped" inside an environment too small to feel confortable, it produces some sort of stress. Stress is known to release catabolic hormones wich, as a result, stunt growth and may never let the animal achieve it's full potencial.
But to wich level? I don't know. Maybe it can have as much as some 20% influence, that's my guess.
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