My hens started laying in April. I am still seeing the odd rubbery egg and not to mention some HUGE double yolker eggs. Every once in a while i notice I am short an egg then the next day there it is. .. a huge beast of an egg. Should i be concerned about these 2 issues? Is it their feed? My birds roam my yard and they're fed chicken feed. As a ''treat'' i have been sprinkling a little turkey feed for them to peck at.