overbreedverb
uk/ˌəʊ.vəˈbriːd//ˌoʊ.vɚ-/bred, bred[ I or T ] to produce more babies or young animals than a particular environment can support:
There are plenty of resources for everyone if we don't overbreed.
Coyotes will not overbreed a given area.
[ T ] to breed animals from particular parents so that they have certain features, in a way that may not be healthy:
Many fashionable dog breeds have been overbred and have genetic problems.