I have recently wormed my laying hens with Safeguard liquid (the one for goats) and am at the tail end of the second 10 day egg withdrawal period. After I realized worming was necessary, I had already moved 7 pullets into the enclosed coop/run, sequestered in a rabbit cage, but they are living on the same ground. The pullets are now 7-8 weeks old and I am wondering if I should go ahead and worm them too. What age is the youngest it is okay to worm a chicken? How much Safeguard liquid do I dose each with? For context, I live in SE Texas and the ground has been very wet lately due to heavy rains. I have had 3 young hens die this year and I suspect they all could have been due to worms, but this hasn't been confirmed by a fecal float or seeing any worms.