My hens are a year and a half old, and have been laying for well over a year. I went on vacation for a week, asking a friend to feed them, and when I came back three of them quit laying. They were laying when I was gone, apparently, but once I got back not a single egg from the three of them. They also are not scratching through their alfalfa like they usually to, it is sitting in the same clump I left it in a couple days ago, when normally they would have plowed through that in an hour. Other than that they seem fine. They wander around and do all the other usual stuff. One is a Auracana, and two are Australorps. I have an Orpington in a separate chicken tractor, (she's a little aggressive) and she continues to lay nearly every day on the same ration of food. What else can I say? Sometimes I give them kitchen scraps. While I was on vacation they didn't get any scraps or treats. They have gone maybe 9 days now without laying.