Personally.........I would,nt sell that cow. We had a neighbour that was breeding registered stock. Got a little too close bred and ended up with a bunch of tailess calves.Bull was 1/2 brother to the Cows.
Breed her to your bull and see what happens
txshowmom.............I was not refering to your cow or your stock.
I gave my opinon.You know fully well the sire could be the genetic problem ......not necessarily the cow.
That same neighbour ,I refered to breed those cows for several more yrs without any problems.