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Manna Pro Crushed Oyster Shell for Chickens – Calcium Supplement for Laying Hens to Support Strong Eggshells – Natural Poultry Mineral Feed for Backyard Chickens – 5 lb Bag

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Size: 5 Pound (Pack of 1)


Style: Oyster Shell


Features

  • FOR LAYING POULTRY: Our crushed oyster shells are crafted to provide essential calcium for all laying poultry including chickens, ducks, and quails; from backyard flock to commercial farms, our product is the perfect addition to your chicken feed
  • OYSTER SHELL & CORAL CALCIUM: Made from a premium blend of crushed oyster shells and coral calcium, this supplement provides a high-quality, easily digestible source of calcium to support strong eggshells and overall health in laying poultry of all types.
  • STRONGER EGGSHELLS WITH NATURAL CALCIUM: Crushed oyster shells provide a rich, slow-release calcium source for backyard hens, aiding proper eggshell formation, improving egg quality, and supporting overall health and laying performance in laying chickens.
  • HEAT TREATED FOR PURITY: Our crushed oyster shells are heat-treated for maximum cleanliness, helping eliminate harmful contaminants, bacteria, and pathogens. This process ensures a clean, safe calcium source you can confidently feed to your poultry.
  • MADE IN USA: Our chicken food is proudly made in the USA, using only the finest ingredients; by choosing our crushed oyster shells for chickens, you're ensuring your birds receive a high:quality, domestically made product that you can trust

Description

Manna Pro Crushed Oyster Shell is a premium calcium supplement formulated specifically for laying hens to support strong, healthy eggshell formation and overall skeletal strength. This natural source of calcium comes from heat- treated oyster shells, which are ground to an optimal size for slow, steady absorption by your poultry. Offering Manna Pro Crushed Oyster Shell self-fed allows hens to self-regulate their calcium intake based on individual needs, reducing the risk of soft or thin-shelled eggs and promoting peak laying performance. This supplement is an essential addition to the diet of backyard chickens, especially those on grain or layer feed, as it provides supplemental calcium not always delivered in standard diets. It also helps maintain strong bones and supports long-term health in laying flocks. With no artificial additives or preservatives, Manna Pro’s Crushed Oyster Shell is safe, effective, and trusted by poultry keepers who prioritize nutrition and egg quality. Choose Manna Pro for all your backyard chicken needs.

Specs & Other Info

SpecificationDetails
BrandManna Pro
TasteEgg
FormPellets
Package Weight5 Pounds
Intended ForBirds, Chicken, Ducks
Continued ProductionNo
Product Size4 x 8.33 x 11.5 inches; 5 Pounds
Manufacturer Recommended Age1 month and above
Model Number1000210
Available SinceJanuary 2, 2007
Made InUSA
Packaging Dimensions10.86 x 7.93 x 3.68 inches
ColorCoral
Size5 Pound (Pack of 1)
Applicable Life StagesAll Life Stages
Quantity1
Product StyleOyster Shell
Recommended for BreedsAll Breed Sizes
UsageOutdoor
Feeding InstructionsOffer Manna Pro Oyster Shell freely in a separate feeder or mix 1 lb with 20 lbs of layer feed. Start at 18 weeks of age and continue during the laying period.

Frequently asked questions

Manna Pro Crushed Oyster Shell provides an essential source of calcium for laying hens, which is critical for the development of strong eggshells. Regular use can help improve eggshell quality, reduce breakages, and support the overall health of your poultry.

You should offer the crushed oyster shell in a separate feeder or container, allowing your laying hens to self-regulate and consume as needed. It's not meant to replace their primary feed but to be available as a supplement to their regular diet.

While specifically formulated for laying hens, the calcium supplement can also benefit other backyard poultry like ducks and quails that lay eggs. However, always ensure that the dietary requirements of any bird species are met when introducing new supplements.

The duration a 5 lb bag lasts depends on the number of chickens you have and their individual consumption rates. Typically, a small flock (5-10 hens) might go through a bag in about 2-3 months, but this can vary greatly. Monitor your flock's consumption and adjust as necessary.

Top Amazon Reviews

🚀 Abunda's Overview

This is our summary and key points to consider based on customer reviews.


The product in question receives high praise for its effectiveness in providing necessary calcium supplementation to chickens, improving egg shell strength. Customers appreciate the bulk purchasing options that offer good value for the price. Its ease of consumption by chickens and the positive impact on their health is consistently noted across reviews.

Pros

  • 🥚 Effective calcium supplement for chickens, improving egg shell quality
  • 💰 Good value for the price, with bulk purchasing options available
  • 🐔 Chickens enjoy the product, with small pebbles easy for consumption
  • 🌿 Potential for natural and healthy egg production enhancement

Cons

  • 🛍️ May be cheaper to buy in larger quantities at local farm supply stores
  • 🏞 Some chickens might prefer home-prepared calcium sources like crushed egg shells

Should I Buy It?

If you're seeking a reliable, affordable, and effective calcium supplement for your chickens to improve their egg shell strength, this product is highly recommended. Despite the potential for finding it cheaper locally or the preference for homemade alternatives, its overall value and positive impact on chicken health make it a great choice for poultry keepers.


  • Would buy again
Size: 5 Pound (Pack of 1) Style: Oyster Shell
Great product and value easy to use for health care digestion appearance was good
Reviewed in the United States on December 10, 2025 by karen

  • Great product!
Size: 5 Pound (Pack of 1) Style: Oyster Shell
Works great for my organic fertilizer blend for bulbs!
Reviewed in the United States on November 19, 2025 by Paul M

  • Good product
Size: 5 Pound (Pack of 1) Style: Oyster Shell
happy chickens and ducks makes for good egg shells
Reviewed in the United States on December 7, 2025 by kaistutu

  • Good for Chickens, NOT for Quail
Size: 5 Pound (Pack of 1) Style: Oyster Shell
This would be good for Chickens. However not so good for Quail. The crush size is too large for Quail. I have tried to reduce the crush size by blender, which did not work, and then bagging it and whacking it with a hammer MANY times, which also did not work. Holy cow, oyster shell is strong!
Reviewed in the United States on September 12, 2024 by Aimee

  • My hens don’t like it
Size: 5 Pound (Pack of 1) Style: Oyster Shell
My hens were molting and needed more calcium. I am not sure if they like this. It looks like very small white gravel. I put it in a bowl and it doesn’t seem like they are eating it. I have taken to sprinkling it in the chickens run. The hens maybe setting it. I just think it’s not as chewable as they would like. It appears to be of good quality. My hens are just picky. They won’t even eat earthworms. ... show more
Reviewed in the United States on October 17, 2025 by Sherri Dale

  • .
Size: 5 Pound (Pack of 1) Style: Oyster Shell
Mixed in with chicken feed and saw an egg shell improvement right away.
Reviewed in the United States on November 8, 2025 by Armando Ramos

  • Great for chickens
Size: 5 Pound (Pack of 1) Style: Oyster Shell
I put the whole bag in a separate chicken feeder. My chickens eat it as they desire.
Reviewed in the United States on November 5, 2025 by Genie

  • A Must for laying chickens.
Size: 5 Pound (Pack of 1) Style: Oyster Shell
This helps make stronger eggshells and is important for the chickens digestion and general health. PLUS they seem to like it!
Reviewed in the United States on October 21, 2025 by Margi

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