What is the most humane way to "brain" a rat?

[mohawk]

Please read the rest of the sentence for instances in which this method is considered acceptable. Our feeder animals are not in a perpetual neonatal state.

You forgot this part :

Manually applied blunt force trauma to the head has been used primarily to euthanize small laboratory animals with thin craniums.334,340,341 It has also been ap:cens0r:plied for euthanasia of young piglets.