Being the sceptical type, my automatic response has always been to scoff at the notion that the commercial breeds (Hyline and Shaver) lay well in their first year or two but don't have the laying longevity of the more traditional breeds. However this year for the first time in my chicken-owning history I have a number of two year old hens - Hylines and Araucanas. Though the Hylines still lay more and go broody a damn sight less, the quality of their eggs is well down on their first season, while the Araucanas' eggs are fine and dandy. The issue is not the number of eggs laid - which is still prodigious, but the enormous size of the Hyline eggs in their second season - large eggs have thinner shells and are more prone to breaking in the nest or while being handled. They have a greater proportion of eggwhite to yolk, so the yolks (still beautifully orange from all the free-ranging) get diluted and my eggy dishes aren't so stupendously brightly coloured. I also have to adjust the quantities of other ingredients in baking because the big eggs add too much liquid. And the egg cartons don't close properly over the outsize eggs - I've carted eggs all over town to deliver to friends and workmates and worried that the large thin-shelled eggs are going to break all over someone's dry-clean-only work clothes. It hasn't actually happened, but I need something to worry about. In short, really big eggs are really annoying.
I concede that my observations are still fairly new and not tested yet across all my breeds, however I've come to the controversial conclusion (controversial in my family anyway - this isn't yet getting much support from my fellow chicken-dispatcher) that I am going to be utterly ruthless every year about getting a new batch of Hylines, and letting the others move on to a happier place. I appreciate them for their egginess, and their placidity, and their chickeny pottering about the garden. However I don't love being irritated by yet another smashed up egg in the nesting box. The "breed" chickens can live with me for as many years as they remain healthy and lay reasonably well, simply because they offer so much variety in their character and eggs. Well, and they're pretty.