All I know is when I feed my BP's, some of them (I'd say 3 out of 10 each time they feed) will take the rat feet first. They are doing just fine. Also, about regurgitation. I guess that may make sense. But you have to take into consideration that once it is inside the snake, it is decomposing at a super fast rate. By the time the snake MAY need to regurge, the rodent would be in a state of decompostion where it wouldn't matter what end was to come out first; it would all come out decomposed.

One other thing. Why would the snake need to regurge a meal if it is being kept in excellent condition like they are supposed to be? (temps, humidity, stress from being handled after a meal, etc).

I just think it isn't that big of a deal; but who knows, I'm no expert.

Cheers,
Jennifer