Straightbred means an animal that comes from parents of the same kind. For example, a straightbred dog has two parents that are the same kind of dog.
Straightbred animals are often thought of as special or valuable because they have a known family history.
Examples:
The straightbred cat has two parents that are the same kind of cat.
I want a straightbred dog, not a mixed one.
The straightbred horse won the race.
My straightbred rabbit is very fast.
The straightbred bird can sing very well.
The straightbred cow is very big and strong.