Get rid of any branches within about 4' of the ground. They'll probably be too shaded to produce any apples and they'll just invite animals to nibble.
Pruning Low Branches
By Marie Iannotti, About.com Guide
Pruning Apple Trees - Removing Low Branches
Marie IannottiMore on Fruit Tree Care
More on the Care of Apple TreesPruning Peaches and Other Stone Fruits
Suggested Reading
Growing and Caring for Berry Plants
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