My ten chickens (supposed to be hens) are now 18 weeks old. This morning one of the sex-links squatted for me. I read on this forum that squatting is a sign that eggs will be coming soon. I have been feeding them medicated feed (amprolium) since they were hatched and still have 3/4 of a 50# bag. Should I stop feeding the medicated feed immediately? Their nesting boxes are ready with bedding and fake wooden eggs. Besides the important question about switching feed, what else should I be doing to get ready for the big event?