Oyster Shell

Give laying hens the natural calcium boost they need with Mile Four Oyster Shell. Made from organic, all-natural oyster shell, it helps chickens produce stronger, thicker eggshells while supporting overall health and longevity. Perfect for hens 20+ weeks old, this simple supplement keeps flocks healthy & eggs durable—naturally.

Key Features:

• Supports Strong Eggshells: Eggshells are 94–97% calcium carbonate—this supplement replenishes what hens lose during daily laying.
• Essential Calcium Source: Strengthens bones, reduces egg breakage, & supports consistent, healthy egg production.
• Boosts Flock Health: Promotes stronger bones, improved cardiovascular function, & overall vitality in laying hens.
• All-Natural Formula: Made from 100% natural, organic oyster shell with no additives, chemicals, or fillers.

• Starter Feed
  Begin with 100% Starter feed, which is high in protein to support early development. Around Week 7, start mixing 75% Starter feed + 25% Grower feed for a few days. Gradually adjust the ratio, reaching 100% Grower feed by Week 9.

• Grower Feed
  Keep pullets on 100% Grower feed to support muscle growth & steady development. At Weeks 19-20, introduce 75% Grower feed + 25% Layer feed to help their bodies adjust to increased calcium levels. Increase the Layer feed portion until reaching 100% Layer feed by Week 21.

• Layer Feed
  Once chickens begin laying eggs, switch to 100% Layer feed, which contains added calcium for strong eggshells. Supplemental Grit & Oyster Shell can further support shell strength.

• Oyster Shell & Grit
  Serve Oyster Shell and Grit in separate small containers, placed near the feeder but never mixed into the feed. Chickens will eat Grit as needed to aid digestion & Oyster Shell to boost calcium for stronger eggs. Refill weekly & keep both dry & accessible at all times.

For a smooth feed transition, adjust the mix gradually, monitoring flock’s appetite & digestion. A balanced chicken diet at every stage ensures healthy growth, optimal egg production, & strong immune function.

Check out our Chicken Feed Guides:
How to Transition by Chicken Age
How to Transition from Old to New Feed
How to Ferment Chicken Feed

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• Risk Free Trial: If your chickens don't love their 1st bag, it's on us.