We are down to only four ducks now, after losing some to ovarian issues and cancer. One of those ducks has ovarian tumors so we will probably lose her within six months. My husband has actually said he would like more ducks. Yah! i had a very bad experience once adding adult chickens to our flock, which apparently had MG, and the outcome was not good. If i do add new adult ducks, how long should i quarantine and what health issues should i look for? Thanks for your time to reply.