eli5: Why is it so difficult to mate endangered species and increase their populations in the same way we mass produce cows and chickens

Question

eli5: Why is it so difficult to mate endangered species and increase their populations in the same way we mass produce cows and chickens

In: Biology

Answer 1

Because you need an animal which can live in the wild, so you can’t just put them in captivity and later release the offsprings, they would die.

Said this not every animal can be held captive. Some just don’t easily breed in captivity, others literally die in captivity like great whites