I only pepper in Oyster shells with their regular food when I see a shell deficiency. My hens had rock hard eggs when they started to lay. They didn't need the extra calcium for over 9 months.
Special human diets don't always translate to our fowl flock. While I enjoy a fermented beer here and then, it's probably going to add gases that could cause discomfort to our feathered friends. Your heart and spirit are right, but a good high quality layer feed with oyster shells only peppered...
Also, what humans think is a special nutritious diet might be robbing hens of their required nutrients and regular diet. Please feed a high quality layer feed and pepper oyster shells only as needed when observing shells. The biggest issue with human women and soy is that it suppresses their...