Bird did you have a representative of the feathers there so they could see what you were offering? Also it isn't a matter of worming with safeguard or not, its just a matter of not using safeguard when the bird is in molt.
This article may be of interest. Its about a study done in , I think India, comparing 3 different wormers, it was done on chickens.
http://en.engormix.com/MA-poultry-industry/health/articles/anthelmintics-poultry-t1660/165-p0.htm
The methodology is a little sloppy, but still, food for thought/
Thanks for the info. I've been doing the 3ml in water for safeguard and pour on ivermectin. Have been having good fecal tests, and my vet told me my routine was working. And now i'm freaking out because I've probably just been lucky. Can the formula (Weight of flock in pounds divided by 2.2...