If it's clear the ants haven't died from disease or parasite, then I can't see any problem with feeding ants from one colony to another. However, in nature, when ants perform raids on colonies of other ants, they seldom kidnap workers as food items, but eggs, larvae and pupae are often consumed. If any of these are surplus then they make much more suitable food items.
Remember, ants have a very high 'shell-to-flesh' ratio. This ratio is often considered by those who keep reptiles and amphibians in selecting a good 'live food' insect. As larvae and pupae have no hardened exoskeleton, they are almost all 'flesh', which is the good stuff!
You may find that workers, even from another species are rejected on this basis.
Tags: Frequently Asked Question | Keeping Ants | Behaviour
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