I found a suitabale answer to your query from the e-book i bought (
http://www.phythonsecrets.com), which I copy below :
"As a rule, avoid live prey. You may be exposing your pet to prey attack and injury. Frozen / thawed food is good. But as in the case of all frozen goods, they are less in nutrients. The choice of most breeders is pre-killed or highly stunned prey. Once you feel confident with this process, you may try to add variety to your pet's feed. In case your pet refuses to eat, try exposing a little of the prey's flesh. If that doesn't work, try dipping the prey in a little chicken broth."