I had my first egg Tuesday it was a big double yoke. Again Wednesday big double yoke. Then today I had a small single yoke and with it from another hen a small soft shell busted egg. They are 19 weeks old. The double yokes were very strong shells. I have oyster shell out for them. Feeding Dumor layer feed. Thinking of switching to Purina with oyster shell already added. Any suggestions

haven't had issues with shells nor egg laying. No more stage feeding and storing different feeds.