Dicalcium Phosphate

1. Introduction

Dicalcium Phosphate (DCP) is an important mineral feed ingredient and a concentrated source of calcium and phosphorus used extensively in animal nutrition. It is particularly valuable for formulating diets for poultry, swine, cattle, sheep, goats, aquaculture, and other livestock.

Calcium and phosphorus are essential minerals involved in:

• Bone and skeletal development
• Eggshell formation
• Muscle and nerve function
• Energy metabolism
• Cellular functions
• Growth and reproduction

Feed-grade Dicalcium Phosphate is commonly produced in anhydrous (DCPA) and dihydrate (DCPD) forms. Commercial specifications can therefore differ in calcium, phosphorus, moisture, and crystal-water content.

---

2. Chemical Information

Important Note on CAS Numbers

The term “Dicalcium Phosphate” can refer to different hydration states.

The commonly encountered feed-grade form is Dicalcium Phosphate Dihydrate (DCPD):

CaHPO₄·2H₂O — CAS 7757-93-9

The anhydrous form is:

CaHPO₄ — CAS 7757-82-6

For a commercial product page, the CAS number should therefore match the actual grade and specification being supplied.

---

3. Structural Formula

Dicalcium Phosphate Dihydrate

CaHPO₄·2H₂O

A simplified ionic representation is:

Ca²⁺ + HPO₄²⁻ + 2H₂O

The material contains calcium ions associated with hydrogen phosphate ions and, in the dihydrate form, two molecules of crystal water.

---

4. Physicochemical Properties

DCP is substantially less water-soluble than some highly soluble phosphate salts, but its nutritional value comes from its calcium and phosphorus content and bioavailability.

---

5. Nutritional Functions

5.1 Calcium Source

Dicalcium phosphate provides a concentrated source of calcium, which is essential for:

• Bone formation
• Skeletal development
• Eggshell formation
• Muscle contraction
• Nerve transmission
• Cellular signaling

---

5.2 Phosphorus Source

Phosphorus is essential for:

• Bone and teeth development
• ATP and energy metabolism
• Nucleic acid synthesis
• Cell membrane structure
• Phospholipid metabolism
• Normal growth and reproduction

DCP provides phosphorus in a form suitable for use in balanced animal diets.

---

5.3 Calcium-Phosphorus Balance

One of the major advantages of DCP is that it supplies both calcium and phosphorus in a single feed ingredient.

Maintaining an appropriate dietary Ca:P ratio is important for:

• Skeletal development
• Mineral absorption
• Growth
• Egg production
• Reproductive performance

The exact dietary ratio should be formulated according to species, age, production stage, and the total mineral contribution of the diet.

---

6. Applications in Animal Nutrition

Poultry Feed

Dicalcium phosphate is widely used in:

• Broiler feed
• Layer feed
• Breeder feed
• Chick starter feed
• Poultry premixes

Broilers

DCP supplies calcium and phosphorus required for:

• Rapid skeletal development
• Bone mineralization
• Growth
• Muscle development
• Normal physiological function

Layers

Calcium and phosphorus are particularly important in laying hens because of the large amount of calcium required for eggshell formation.

DCP can contribute to:

• Eggshell formation
• Bone mineral reserves
• Egg production
• Mineral balance

However, layer diets commonly require additional calcium sources such as limestone or calcium carbonate, because the calcium requirement can be substantially higher than the amount supplied by DCP alone.

---

7. Swine Feed

DCP is commonly used in pig diets, including:

• Piglet feed
• Grower feed
• Finisher feed
• Sow diets

It provides calcium and phosphorus needed for:

• Skeletal development
• Bone mineralization
• Growth
• Normal metabolic function

In young pigs, mineral nutrition is particularly important because of rapid skeletal development.

---

8. Ruminant Feed

DCP can be used in diets for:

• Dairy cattle
• Beef cattle
• Calves
• Sheep
• Goats
• Other ruminants

Potential nutritional applications include:

• Supporting skeletal development
• Maintaining mineral balance
• Supporting growth
• Supporting reproduction
• Supplying dietary calcium and phosphorus

DCP can be incorporated into mineral premixes, concentrates, compound feeds, and total mixed rations, depending on formulation requirements.

---

9. Aquaculture

Calcium and phosphorus are also essential nutrients for cultured aquatic animals.

DCP can be incorporated into feeds for selected:

• Fish
• Shrimp
• Crustaceans
• Other aquatic species

Potential applications include:

• Skeletal development
• Mineral nutrition
• Growth
• Bone formation
• Normal physiological development

The appropriate phosphorus source and inclusion level should be determined according to the specific species and feed formulation.

---

10. Key Benefits

Dual Mineral Source

DCP provides both calcium and phosphorus, simplifying mineral formulation.

Supports Bone Development

Adequate calcium and phosphorus are essential for normal skeletal formation and mineralization.

Supports Poultry Production

Calcium and phosphorus contribute to normal eggshell formation and reproductive performance.

Supports Growth

Provides essential minerals required during rapid growth and development.

Suitable for Multiple Species

Widely applicable to:

• Poultry
• Swine
• Cattle
• Sheep
• Goats
• Aquaculture

Useful in Premixes

DCP can be incorporated into mineral premixes and compound feeds according to the required nutrient contribution.

---

11. Dicalcium Phosphate vs. Monocalcium Phosphate

Both are common calcium-phosphorus feed ingredients, but their chemical composition and nutrient concentrations differ.

The choice depends on the required calcium-to-phosphorus ratio, phosphorus concentration, digestibility, formulation, and cost.

---

12. Dicalcium Phosphate vs. Tricalcium Phosphate

DCP is generally preferred when a balanced calcium-phosphorus source is required.

---

13. Typical Feed-Grade Specifications

Commercial DCP specifications vary depending on production process and grade. A typical specification may include parameters such as:

Important: Actual nutrient values vary by DCP source, hydration state, production process, and commercial specification. The exact calcium and phosphorus content should always be stated according to the supplier’s CoA/specification.

---

14. Quality Control

Feed-grade Dicalcium Phosphate should be evaluated for:

• Total phosphorus
• Calcium
• Fluorine
• Moisture
• Water-soluble phosphorus, where applicable
• Particle size
• Heavy metals
• Arsenic
• Lead
• Cadmium
• Mercury, where applicable
• Insoluble matter
• Microbiological quality
• Identification

For phosphate minerals intended for food-producing animals, fluorine and heavy-metal control are particularly important.

---

15. Packaging

Common commercial packaging includes:

• 25 kg bags
• 500 kg big bags
• 1,000 kg jumbo bags
• Kraft paper bags with PE inner lining
• PP woven bags
• Customized industrial packaging

Packaging should protect the product from:

• Moisture
• Contamination
• Excessive humidity
• Physical damage

---

16. Storage

Store Dicalcium Phosphate in a:

• Cool
• Dry
• Clean
• Well-ventilated

warehouse.

Recommended practices:

• Keep bags tightly closed.
• Protect from moisture.
• Avoid direct contact with water.
• Store on pallets rather than directly on the floor.
• Avoid contamination from other mineral products.
• Follow the manufacturer’s recommended shelf-life conditions.

Although DCP is relatively stable, excessive moisture can adversely affect its flowability and physical handling characteristics.

---

17. Regulatory Considerations

Dicalcium phosphate is widely used as an animal feed mineral source, but feed-grade specifications and permitted contaminant limits vary by country and region.

For international sales, suppliers should verify:

• Feed-grade status
• Calcium and phosphorus specifications
• Fluorine limits
• Heavy-metal limits
• Permitted animal species
• Applicable feed-additive/mineral regulations
• Labeling requirements
• Import requirements
• Applicable quality standards

The product specification should be prepared according to the requirements of the intended destination market.

---

18. Technical Summary