8 days ago we introduced 2 new chicks to our flock. Original flock was 3 White Rocks, 1 Americana and than we added 2 Black Sex Link Chickens. They hate each other and no one is laying eggs now. The original free roaming flock is almost never free roaming with the new Black Sex Link chicks. I expected the new chix to not lay for awhile, but I didn't realize my older chicks would stop laying. Has anyone else experienced this?