Question for some of you who have raised chickens longer than I have: How often do you cull your older birds? I was doing some reading a few nights ago, and one book that I own recommended doing a wholesale culling almost every spring/summer because egg production really drops off in the 2nd year, and it's best to not bring in a few new pullets at a time because it stresses the flock so much that it will also cause a drop in production. If I'm not lighting my pullets through the winter, which I'm not, I don't see how their production could begin to really drop off this next year. Heck they just really got their eggs up to a good, consistent size a couple of months ago (now ~ 9 mos old). So what do you guys that don't consider your birds members of the family, i.e. pets, do?