My experience has not been good. I ordered mix ducks from tractor supply and it was all males. I recently separated the poor male pekin who had the 3 Indian runners and 2 mallards fighting over who got to go next. If I had known this was going to happen I wouldn't have ordered.
I used vetrx for my older goat that was coughing and it worked. I put some of the liquid on piece of bread and she ate it. I have younger one that just got cough and I'm going to try it again.