I have a mixed aged flock and my bigs eggs have been nasty lately, like gross smelling and with some of them the white and yolk mix when you crack them into the pan and the stink too :/ The bigs are 3-4 years old (I bought them from a gal rehoming her birds) and so I'm wondering if this is an age thing or what the heck is going on?? Anyone experience anything like this? I'm thinking maybe it's culling time for the bigs? Only a couple even lay anymore