Feeding Eggshells To Chickens: What You Need To Know
- Jan 26, 2025
- 3 min read
Updated: Apr 16
Feeding Eggshells to Chickens: The Basics
There’s a common belief among chicken keepers that feeding eggshells to chickens is a good idea. After all, shells are made of calcium carbonate, and chickens need calcium for strong bones and healthy eggs. It seems logical—but when your hens are already on a nutritionally complete layer feed, feeding eggshells to chickens can actually do more harm than good.
Understanding Calcium Requirements
Laying hens require significant amounts of calcium to produce strong eggshells. Calcium supports not just the eggshell itself, but also skeletal strength and proper muscle function for egg-laying. Many keepers think feeding egg shells is a natural way to provide calcium, but this approach carries hidden risks.
The Role of a Complete Layer Feed
High-quality layer feed is carefully formulated to provide all the nutrients hens need—including fast-release calcium for daily egg production. When hens are offered egg shells in addition to feed, they may consume more calcium than necessary. Excess calcium forces the kidneys to filter out what the body cannot use, which over time can lead to kidney stress or damage.
Additionally:
Feeding egg shells doesn’t directly cause egg-eating—it’s actually a learned behavior. If a hen lays a soft-shelled egg or an egg accidentally breaks in the nest box, she may discover the contents are edible. Over time, this can lead to repeated egg-eating, as the hen associates broken eggs with a food source.
Layer feed already contains all the vitamins, minerals, and balanced calcium required for strong, healthy eggs.
Fast vs. Slow Calcium
It’s important to understand that not all calcium works the same way in the hen’s body:
Layer feed calcium is fast-release, absorbed quickly during the day while she is consuming it.
Eggshell calcium is also fast-release, which means combining the two can easily overload the hen’s system.
Oyster shell provides slow-release calcium. Hens instinctively self-regulate, taking what they need when they need it, especially overnight when eggshell formation occurs.
This natural, slow-release process supports not only eggshell strength but also muscle contraction during laying, helping prevent prolapsed vent, and contributes to strong bones to prevent osteoporosis.
Managing Calcium Sources Safely
Every hen is unique: some require more calcium if they lay frequently or produce larger eggs. Offering oyster shell in a separate dish allows hens to regulate their own intake, taking only what they need. Typically, they’ll peck at the oyster shell before roosting, ensuring a steady supply of calcium while sleeping and forming eggshells.
Key Takeaways:
Do not mix oyster shell into feed.
Do not feed egg shells if your hens are on complete feed.
Use slow-release calcium (oyster shell) free-choice to support health naturally.
When Supplements Can Help
In some cases—particularly in winter or pre-lay periods—hens may benefit from an additional calcium and vitamin D3 boost. Products like Chick’ N Calcium provide highly absorbable calcium plus vitamin D3, supporting eggshell quality, skeletal strength, and proper muscle function during laying.
Use supplements as a boost, not a replacement for a balanced diet. Proper feed and free-choice oyster shell should remain the foundation of your flock’s nutrition.
Pre-Seasonal Egg Support
Chick’ N Calcium is ideal for pre-lay support, giving your hens extra calcium at critical times without disrupting their daily feed balance. This ensures strong, healthy eggs, robust bones, and proper muscle function for egg laying.
Final Thoughts
Feeding your hens egg shells may seem eco-friendly, but when they are already on a complete layer feed, it’s an unnecessary risk. Over-supplementing calcium can lead to kidney issues, nutritional imbalance, and even egg-eating behavior.
By providing a complete layer feed and free-choice slow-release calcium, you ensure that your hens get what they need—when they need it—without compromising their health.
When nutrition is right, everything else starts to fall into place. Hens produce strong, healthy eggs, maintain skeletal strength, and lay efficiently—without the guesswork or risks that come from feeding eggshells.
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