I recently bought a neonate GTP which went off feed for a 5 weeks, probably due 24hr transportation in a car and settling in to the new cage. I got my GTP back on track by scenting the mouse with chick down. I just thawed the mouse in warm water as usual, added some chick down to the mouse and after slight tapping on the sides the GTP took the meal and has been eating since. I´ve read that some people have also used egg yolk for scenting.