Marine Shell Grit for Strong Eggshells 10 kg | 3–5 mm Calcium Grit for Chickens

Drobshell GRIT Crushed Marine Shell Grit 3–5 mm (10 kg bag) is a natural calcium supplement for laying hens and other poultry, designed to replenish calcium and essential minerals in the diet. Marine shell grit is one of the simplest and most effective ways to produce strong eggshells while reducing egg breakage. Naturally rich in calcium, phosphorus and sodium, it supports proper eggshell formation and overall bird health. In addition, the coarse shell particles aid digestion by helping the gizzard grind feed more efficiently, improving nutrient absorption. Drobshell GRIT 3–5 mm is suitable for laying hens, broilers, ducks, geese, turkeys, pheasants and adult ornamental birds. The economical 10 kg bag provides a long-lasting supply of natural marine shell grit for healthier poultry and stronger eggs.

Marine Shell Grit for Chickens – Key Benefits

• Supports strong eggshells and healthy bones in poultry.
• 100% natural feed supplement – a natural source of calcium, phosphorus and sodium.
• Improves laying performance by supporting healthy egg production.
• 3–5 mm particle size – the larger shell pieces dissolve more slowly in the digestive system, providing a gradual release of calcium and essential minerals.
• Promotes healthy digestion – helps the gizzard mechanically grind feed, improving digestion and nutrient utilisation.
• Balances the poultry diet – recommended for birds fed with home-mixed or farm-produced feeds.
• Can be fed free-choice or mixed with feed – birds naturally consume the amount required according to their calcium needs, especially during periods of high egg production or dietary deficiencies.
• Economical 10 kg pack – provides enough marine shell grit to supplement approximately 200 kg of feed.

Why Do Chickens Lay Thin-Shelled Eggs?

Thin or weak eggshells are a common problem caused primarily by calcium deficiency and mineral imbalance in laying hens. Even when birds receive a complete feed, calcium levels may not always meet the high demand associated with egg production. Maintaining the correct calcium-to-phosphorus ratio is equally important, as phosphorus directly influences calcium absorption. Eggshell formation mainly takes place overnight, when hens obtain calcium not only from the digestive tract but also from their bones. Excess phosphorus can reduce calcium absorption, resulting in thin, rough, misshapen or soft-shelled eggs. Supplying the correct balance of minerals helps produce stronger eggshells, supports healthy bones, reduces the risk of paralysis and contributes to improved laying performance.

Is Marine Shell Grit Better Than Agricultural Limestone?

If your flock shows signs of calcium deficiency, such as weak eggshells or reduced shell quality, additional calcium should be included in the daily diet. Calcium supplements are available in liquid form for drinking water, as agricultural limestone, or as crushed marine shell grit. While both sources help replenish calcium, marine shell grit remains in the digestive system for longer, gradually releasing calcium, phosphorus and sodium in balanced proportions. By choosing natural marine shell grit, you provide laying hens with a continuous source of minerals throughout the day and night, precisely when eggshells are being formed.

How to Feed Marine Shell Grit to Poultry

Marine shell grit can be offered in two ways:

1. Free-choice feeding
   Provide the shell grit in a separate feeder, allowing birds to naturally regulate their calcium intake according to their nutritional needs, especially during periods of intensive egg production.
2. Mixed with feed
   Recommended dosage: approximately 50 g of marine shell grit per 1 kg of feed.

For best results, marine shell grit should be offered to laying hens in the afternoon or evening, as hens utilise calcium overnight while forming eggshells. If birds selectively avoid the larger shell particles and you have access to a grain mill, the shells can be ground into a finer consistency and mixed directly with poultry feed.