How Often Should You Feed Oyster Shells to Your Chickens? A Complete Guide

One of the most important things you can do for your feathered friends is to ensure they have proper nutrition. This includes providing them with the necessary vitamins and minerals, such as calcium, which is crucial for egg production and overall health.

One of the most common ways to provide chickens with calcium is through oyster shell supplementation. But how often do you need to feed oyster shells to your chickens? Let’s take a closer look.

Crushed Oyster Shells

Crushed Oyster Shells


Crushed oyster shells are an essential calcium source for laying poultry like chickens, ducks, and quails. They contain a blend of finely ground oyster shells and coral calcium, providing easily digestible and superior-quality calcium.

What are Oyster Shells and Why Do Chickens Need Them?

Oyster shells are a common and popular supplement for chickens. They are the hard, protective outer layer of the oyster that is used to create a barrier between the oyster and its environment. When ground into small pieces, these shells become an excellent source of calcium for chickens.

Calcium is a vital nutrient that plays a crucial role in a chicken’s overall health. It is essential for the formation of strong and healthy eggshells, which is why it is particularly important for chickens that are laying eggs. Without enough calcium, chickens can experience thin or weak eggshells, which can lead to broken eggs, reduced egg production, and even health problems for the chicken.

In addition to supporting healthy egg production, calcium is also important for the overall bone health of chickens. Calcium helps to maintain strong bones, which is important for supporting the chicken’s overall health and mobility.

How Often Should You Feed Oyster Shells to Your Chickens?

The answer to this question largely depends on your chickens and their individual needs. Some chickens may require more calcium than others, and their dietary needs may also change depending on their age and reproductive status.

One common approach to feeding oyster shells is to provide them with free choice, which means leaving a pan or feeder full of oyster shells available to your chickens at all times. This allows them to consume the oyster shells as needed, without you having to worry about over- or under-supplementing them.

Another option is to mix oyster shells in with your chickens’ feed or scratch. This allows them to consume the oyster shells while they are foraging and scratching for food. Again, you can add the oyster shells to the feed or scratch them and let your chickens take what they need.

Some chicken owners may also choose to offer oyster shells on a more regimented schedule, such as once or twice per week. This can be a good option for those who are concerned about their chickens getting too much calcium, or for those who have a smaller flock and want to monitor their intake more closely.

Ultimately, the best approach to feeding oyster shells to your chickens will depend on your flock and their needs. Some chicken owners find that their birds don’t consume much oyster shell at all, while others may go through it quickly. Keep an eye on your chickens’ behavior and overall health, and adjust their calcium supplementation as needed.

Signs Your Chickens Need More Calcium

While it can be difficult to determine exactly how much calcium your chickens need, some signs can indicate they are not getting enough. If you notice your chickens laying eggs with thin, weak, or soft shells, this is a clear indication that they need more calcium in their diet. Additionally, chickens that are hunching or appear nervous may be experiencing a calcium deficiency.

If you notice these signs in your chickens, it may be time to increase their calcium supplementation. You can offer more oyster shells free-choice, mix them into their feed or scratch, or even crush up eggshells and offer them as a supplement.

In general, it’s always better to err on the side of caution when it comes to calcium supplementation. Providing your chickens with plenty of calcium can help to ensure strong, healthy eggshells and support their overall health and well-being.

Natural Alternatives to Oyster Shells for Your Chickens

You may not have access to oyster shells or may prefer to use alternative sources of calcium. Some of the alternatives to oyster shells for chickens.

  1. Crushed Eggshells – One of the easiest alternatives to oyster shells is using crushed eggshells. Not only is this option cost-effective, but it is also an excellent way to recycle eggshells from your chickens. Simply clean and crush the eggshells, and then feed them back to the chickens. However, it’s important to note that eggshells may not be as effective as oyster shells as they contain less calcium per gram.
  2. Limestone Grit – Limestone grit is another source of calcium that is commonly used as a substitute for oyster shells. This type of grit is made of ground limestone and provides chickens with both calcium and essential minerals. It can be fed free-choice, or mixed with chicken feed. However, it’s important to ensure that you use food-grade limestone grit, as some types may contain harmful impurities.
  3. Calcium Supplements – Calcium supplements are an effective way to provide chickens with the necessary amount of calcium without using oyster shells. These supplements come in various forms, including powders and pellets, and can be easily mixed into the chicken’s feed. Some calcium supplements also contain additional vitamins and minerals that may benefit the chickens’ overall health.
  4. Cuttlebone – Cuttlebone is a lightweight, porous internal shell of a cuttlefish and is an excellent source of calcium for chickens. It is often sold in pet stores as a bird supplement and can be offered to chickens as a free-choice option or added to their feed. However, cuttlebone may not be as effective as oyster shells as it contains less calcium per gram.
  5. Seashell Grit – Seashell grit is another alternative to oyster shells made of crushed and ground seashells. Like oyster shells, it is a natural source of calcium and minerals, but it may not be as effective. Seashell grit can be fed free-choice or mixed with the chicken’s feed.

Final Thoughts

Feeding oyster shells to your chickens is an important part of their overall nutrition. While the frequency with which you need to feed them oyster shells will depend on your flock and their needs, offering them free choice or mixing them into their feed or scratch can be a great way to ensure they are getting enough calcium. Keep an eye on your chickens’ behavior and eggshell quality, and adjust their supplementation as needed. With proper nutrition and care, your chickens can live happy, healthy

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