Egg size and grade are not related to one another. Size is determined by weight per dozen. Younger hens tend to lay smaller eggs. The size increases as the hen grows older and bigger. Grade refers to the quality of the shell, white and yolk and the size of the air cell.
From time to time, the Colorado Egg Producers sends out information for educators and the general public. When you register you can select which group to join. You can remove your name from the address list at any time.