Know who you deal with... show up unannounced to check things out...verify PRIOR to double check their story about who puts the embryos in.....keep a few so you have DNA if you need it....don't believe anything unless you can verify it... double check their stories.....
Right now, I have a cooperator herd put in my embryos and I pick up the calves in the fall at weaning or in July if they are show calves. No trading cows etc, etc. The herd has beening doing it for years, and have an untouchable record on both conception, and weaned calf size and health. They have strict standards for their herd and the embryos they put in..... everything works out great when you have good embryos!!!