Great question, Annasg. Everyone hates when you gather a carton of eggs and excitedly carry them back to the house for breakfast only to find a few have broken along the journey. Strong eggshells are important!
Calcium and vitamin D3 are two of the more important nutrients needed to build strong eggshells. Calcium is the most important nutrient for eggshell development, and vitamin D3 is vital to getting the calcium where it needs to go. Each eggshell typically contains about 2 grams of calcium, which makes up 40 percent of the shell. Hens need to consume 4 grams of calcium in order to put the amount required for building a strong shell into an egg (not all of that calcium goes to shell production!).
The key to becoming an effective general contractor for helping your hens build strong shells is using a feed that includes slow-release calcium. If you have an organic flock, look for a layer feed that contains 3.25% calcium. If you have a traditional flock, you can bring calcium to the next level with feeds like
Purina® Layena®, which includes the Oyster Strong™ System.
Available exclusively in traditional Purina® Premium poultry feeds, the Oyster Strong™ System helps your hens build strong shells. This feed is specially formulated to provide a slow-release calcium source that breaks down at night, when eggshells are being formed.
The oyster shell included in the Oyster Strong™ System is a good way to provide calcium because of its large particle size. Smaller calcium particles break down quickly, but the oyster shell particles contained within the feed have a slower transit time. This means the calcium source stays in the hen longer and plays an important role in eggshell formation at night when hens need calcium most.