Their young will break forth; they will be multiplied with offspring: [their young] will go forth, and will not return to them.
WEB
Job 39:4
Their young ones become strong. They grow up in the open field. They go out, and don’t return again.
Parallel Translations
Their young will break forth; they will be multiplied with offspring: [their young] will go forth, and will not return to them.
Their young ones are in good liking, they grow up with corn; they go forth, and return not unto them.