Ive been using zyfend every 3 weeks for several months now and one of my oldest hen (7yrsold) has green watery poop now so im debating on using safeguard IF she has worms. where do i get safeguard and what dosage? ThanksI have been worming my hens for the last couple of months with Zyfend A.I have seen no worms at all in their droppings.I normally use safeguard.Which is a goat wormer.I had read about it here and decided to give Zyfend a try.I order it from Jeffers Livestock.