One appropriate size rat a week is fine and actually depending on the age of the animal you can even feed more.
And I think you mean power feed.
Now for the biting it can be stress related or food related she actually might not eat enough?
Anyway if you could give us more info, animal's age and size, enclosure size, husbandry (temps, humidity etc) sire of the rat offered, how often the animal is handled and for how long....
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