Both look like mixed breeds to me. The first one (hen) may have Columbian Rock in her. I can't identify any specific breeds in the second bird (rooster).
If they didn't have the red, just the white with the black collar and tail, they'd likely be Colombian Rocks. But that red color shows they were mixed with, well something Red
. The other parent was straight combed and yellow legged, beyond that it's hard to narrow down.