Grit for Chickens: When in Doubt, Put it Out

By Tiffany Towne – It’s hard to make an argument against using grit for chickens, along with oyster shell supplements. They’re both fairly inexpensive and a little lasts a long time. But from a nutritional viewpoint, the stakes are much higher. These two supplements (yes, they are two very different things) are essential for healthy birds and maximum egg production.

It’s always a good time to review what to feed chickens and why you should make grit and oyster shell supplements available free choice — in separate feeders — all the time. According to Twain Lockhart, a poultry consultant for Nutrena brands, “It’s better for birds to have continual access to grit and oyster shell and not need them, than to need them and not have them.” Here’s why.

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Grit for Chickens and the Gizzard

From beaks to vents, chickens have one of the most efficient digestive systems in the animal kingdom. Very little of what they eat goes to waste, despite the fact that they have no teeth. Instead, they swallow tiny rocks that end up in their muscular gizzard. Food that mixes with these pebbles is ground up as the gizzard contracts, breaking food particles into tiny specks the bird can digest. Lack of grit can lead to digestive blockages, poor feed conversion, discomfort, and even death.

Who Needs Grit?

Generally, hens exclusively eating commercial feed (think caged production operations) don’t need grit because the feed quickly dissolves in their digestive tract. But as soon as chickens get other types of feed, they need grit to break it down so the gut can absorb it. Grit is essential for any bird consuming large particle-sized feed (grains, grass, weeds, etc.). The same goes for birds that are confined to a coop and given any scratch, grain or kitchen scraps.

Biggest Myth of Grit for Chickens

Many people think free-range birds don’t need grit. False. Grit should be available even to free-range chickens if there is any chance they can’t find natural grit materials in their surroundings. (For example, areas with clay soils, lack of small gravel particles, heavy snow cover or grass pastures.)

How Much Grit for Chickens

It’s best to give birds free access to grit. They’ll take what they need for proper digestion. Feed stores sell insoluble grit for this purpose. NatureWise poultry feed now offers 7-pound bags of both oyster shell and grit, which is enough to last a small flock all year. The grit is a mix of two particle sizes, so it works for smaller birds and standard breeds.

When to Start Grit for Chickens

Start chicks on grit once they leave the brooder and are introduced to outside forage and feed sources that are not solely a pellet or crumble (grass, greens, bugs) and/or once you start feeding scratch or any grains.

Lay out the Calcium

Laying hens require much more calcium (three to four times) in their diet to support laying and to create eggs with hard shells. Feeding layer feed will keep laying hens healthy and productive. But extra calcium is essential to help prevent thin eggshells, birds that eat their own eggs, and prolapse. Eggshells consist primarily of calcium carbonate, the same material found in oyster shells. Likewise, calcium supplements are typically ground-up oyster shells or natural calcium stones. These dissolve in the hens’ digestive tract and add calcium to their diet.

Who Needs Oyster Shell and When?

All laying hens should have access to a separate container full of crushed oyster shells. Begin feeding free choice when pullets come out of the brooder.

Biggest Oyster Shell for Chickens Myth

Like the grit myth, many people think feeding a high-quality layer feed means an oyster shell supplement isn’t needed. False – even the elevated amount of calcium in most layer feeds might not meet the daily requirements for all hens at all times.


How Much Oyster Shell

Give birds free access to oyster shell and they’ll take what they need, based on age, diet, breed, stage of production, etc. Older hens, for instance, need more calcium than younger hens. Hens on pasture obtain some amount of calcium naturally, but illness in the form of sick chicken symptoms may cause a calcium imbalance. In warm weather, when all chickens eat less, the calcium in a hen’s ration may not be enough to meet her needs. On the other hand, a hen that eats extra ration in an attempt to replenish calcium gets fat and becomes a poor layer. The solution is simple. Put the ground oyster shell in a small dish or sprinkle it on the coop floor for hens to discover and eat. If you are feeding a layer-specific feed along with oyster shell as a source of supplemental calcium, you should be covered, assuming all birds have access and can get their full requirements of feed and oyster shell.

One Final Myth Debunked

Despite all the information available, there’s still some confusion that grit for chickens and oyster shell for chickens are the same thing, and you don’t need both. Not so! Oyster shell is soluble in the digestive tract. It dissolves after a period of time and the calcium is taken up. Grit is insoluble and will stay in the crop (a pouch in the esophagus used to store food temporarily before moving it to the stomach) and help with digestion without dissolving. Remember, when it comes to grit and oyster shell, if you’re wondering how much should I feed my chickens, the general rule is: when in doubt, put both out.

Originally published in 2013 and regularly vetted for accuracy.

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