Broiler Feed vs Layer Feed: What Is the Difference?

By Dr Duncan Houston

Chickens raised for meat and chickens kept for eggs have different nutritional needs. Their feeds may contain many of the same ingredients, but the proportions change to support growth, egg production and long-term health.

Choosing the right bag means knowing both the bird’s purpose and its stage of life. A chick that will eventually lay eggs still needs feed for a growing chick.

Quick Answer

Meat chickens, commonly called broilers, need diets that support rapid muscle development, skeletal growth and efficient weight gain. Laying hens need diets that support egg production, with substantially more calcium for eggshells. Broiler feeds generally provide higher protein concentrations during early growth, while layer feeds balance protein, energy and minerals around egg output and daily feed intake. Choose a complete feed labelled for the bird’s age and purpose.

Why do meat chickens and laying hens need different feeds?

A broiler builds a large amount of body tissue over a relatively short growing period. Its diet must supply enough usable energy and amino acids to support that growth, alongside the minerals needed for a developing skeleton.

A laying hen has a different ongoing demand. She must maintain her own body while repeatedly producing an egg, including its protein, fat and calcium-rich shell.

Neither job can be supported by grain alone. Both require a balanced diet, but the balance changes with age and production.

There is also a separate category called broiler breeders. These are the parent birds producing fertile eggs for the meat chicken industry. They require a specialised breeding and bodyweight management programme, rather than the standard feeding programme for birds being grown for meat.

How do the nutritional levels compare?

The figures below illustrate common commercial feeding patterns. They are percentages of the finished feed, not instructions for mixing a ration at home.

Nutritional feature	Chickens raised for meat	Hens actively laying eggs
Crude protein	Often around 20 to 24% during early growth, reducing towards roughly 17 to 20% in finishing diets	Commonly around 16 to 18%, although some production stages and lower feed intakes require higher concentrations
Calcium	Usually below about 1%, with requirements changing through growth	Commonly around 3.5 to 4.7%, depending on age, intake and production
Amino acid balance	Supports muscle, feathers and other growing tissues	Supports egg protein, feathers and body maintenance
Energy	Concentrated to support growth and efficient feed conversion	Matched to egg output, feed intake and body condition
Feeding stages	Starter, grower and one or more finisher diets	Chick starter, pullet grower or developer, then layer diets

These ranges are a guide, not universal specifications. Genetics, climate, feed ingredients and production targets affect the appropriate formulation. Use the feed manufacturer’s instructions and the breeder’s recommendations for your birds.

Protein matters, but the percentage does not tell the whole story

Protein provides amino acids, the building blocks used to make muscle, feathers and egg protein. Lysine and methionine are important in both broilers and layers.

What matters is whether the diet supplies the right amounts of digestible amino acids. Two feeds with the same crude protein percentage can differ in how well they meet a chicken’s needs.

That is why choosing the bag with the biggest protein number is not a reliable feeding strategy. The complete formulation matters.

Why is calcium so much higher in layer feed?

Producing an eggshell requires a substantial supply of calcium. A laying hen also needs to maintain her skeleton, so inadequate dietary calcium can affect both shell quality and bone strength.

The source and particle size matter too. Suitable coarse calcium particles can remain available during the overnight period when much shell formation occurs. Commercial layer diets account for these needs through their mineral formulation.

The percentage printed on the bag must be considered alongside how much feed the hen actually eats.

For example, 100 g of feed containing 4% calcium provides 4 g of calcium. If she eats only 80 g of that feed, she receives 3.2 g. This is an illustration of nutrient intake, not a universal daily feeding target. Layer nutrition programmes adjust dietary concentration around actual intake and production stage.

How do energy requirements differ?

Broiler feeding programmes generally use nutrient-dense diets to support their growth potential. Feeding a diet designed for developing replacement layers can slow growth because its energy and protein concentrations may be too low for that purpose.

However, the right programme still depends on the type of meat bird and the intended market weight. Fast-growing broilers and slower-growing meat breeds should not automatically be managed identically. Growth must remain compatible with sound legs and good welfare.

For laying hens, energy supply needs to support egg production while maintaining appropriate body condition. Feed intake also changes with temperature. In hot weather, chickens commonly eat less, so the amount of nutrients consumed can fall even when the feed itself has not changed.

What are broiler and layer feeds made from?

Typical ingredients include:

• Cereal grains, such as wheat, maize or sorghum, to supply much of the energy.

• Protein ingredients, such as soybean meal or canola meal.

• Fats or oils, where needed to adjust energy density.

• Calcium and phosphorus sources, balanced for the bird’s stage.

• Vitamin and trace mineral premixes, plus individual amino acids where required.

The ingredient list alone cannot tell you whether a feed is suitable. Two bags can contain similar raw materials in very different proportions.

Both groups need phosphorus, vitamin D and other essential nutrients. Vitamin D supports calcium and phosphorus absorption, while these minerals contribute to skeletal health. Adding calcium without considering the rest of the ration can disturb that balance. A properly formulated complete feed already includes the necessary vitamin and mineral supplementation.

What should chicks and young pullets eat?

A pullet is a young female chicken developing towards laying age. During this period, the feeding goal is appropriate growth and development before egg production begins.

Use a suitable chick starter, followed by the recommended grower or developer feed. Move onto a laying ration at the stage advised for that strain and feed programme, around the transition into egg production.

Being bred to lay eggs does not make adult layer feed suitable from hatch. Rearing nutrition affects the bird’s condition when she reaches maturity.

Broilers have their own progression through starter, grower and finisher feeds. The timing depends on the feeding programme, growth targets and planned processing weight. Follow the programme supplied for your birds rather than copying a timetable intended for another strain.

What happens if you use the wrong feed?

The concern is a continuing mismatch between what the bird eats and what its body needs.

Feeding mismatch	Main concern	What to do
Adult layer feed given to growing chicks or broilers	Calcium is unnecessarily high and can damage the kidneys of growing birds	Replace it with the appropriate growing ration
Broiler feed used as the sole diet for laying hens	Calcium is generally inadequate for sustained shell production	Move to a suitable layer ration
Complete feed heavily diluted with grain or scraps	Essential nutrients become diluted across the total diet	Restore the complete ration as the main feed

High-calcium diets are particularly unsuitable for growing chickens. Conversely, a feed designed for growth does not automatically meet a laying hen’s mineral needs.

If the wrong ration has been used regularly, keep the label and note how long it was fed. Those details help a poultry veterinarian or nutritionist assess the likely consequences.

Can broilers and layers share one feed?

For broilers and actively laying hens, separate feeding groups make it easier to meet their different requirements.

If you keep a mixed flock, ask the feed supplier to confirm exactly which ages and classes of birds a proposed ration suits. Do not assume a product labelled “all flock” delivers the ideal programme for every broiler, chick and laying hen.

Where a shared ration is being considered, the plan must address the laying hens’ calcium needs without feeding high calcium levels to growing birds. Adding oyster shell does not correct every other possible mismatch in protein, energy or amino acids.

How to choose the right chicken feed

1. Identify the birds and their current stage. Record whether they are meat chickens, growing replacement pullets or hens already laying.

2. Choose a complete feed for that group. Check the intended use on the label. A concentrate or supplement must be mixed as directed and is not a ready-to-feed complete ration.

3. Compare the relevant specifications. Look at protein and calcium alongside the product’s stated purpose. Ask the supplier about amino acid and energy specifications if comparing commercial programmes.

4. Check feeding instructions and medication warnings. If a feed contains medication, confirm that it is suitable for those birds and follow any restrictions concerning eggs or meat.

5. Keep the ration balanced. Avoid substantial additions of grain, scraps or supplements unless the whole diet has been formulated to include them.

6. Record the response. Track broiler weights and feed use, or layer egg numbers, shell quality and body condition. Record changes in appetite and water use as well.

The label and feeding directions are the starting point. Keep a photograph of each feed label and its batch details so you can check exactly what was supplied if a problem develops.

When poor performance needs more than a feed change

Thin shells, reduced egg output or poor growth warrant a feeding review, but they do not prove a nutrient deficiency.

For example, heat stress can reduce feed intake and weaken shells through changes in the hen’s physiology. Disease can also affect shell formation. Simply adding extra calcium may fail to address the cause.

Check water availability, feeder access, recent feed changes and environmental conditions. If performance continues to deteriorate, arrange a poultry veterinary assessment and ration review rather than repeatedly changing products.

Birds that collapse, struggle to breathe or cannot stand need prompt veterinary attention. Sudden deaths affecting several birds require urgent investigation.

Common feeding mistakes to avoid

• Choosing feed by price or protein percentage alone.

• Giving adult layer feed to chicks because they will eventually become laying hens.

• Assuming more calcium or more supplements always improves performance.

• Letting grain and scraps replace a substantial part of a complete ration.

• Treating persistent poor growth or weak shells as a feed problem without checking the flock’s health.

Keep good feed in good condition

Store feed somewhere cool, dry and protected from pests. Rotate stock, follow the manufacturer’s storage guidance and discard feed that is mouldy or spoiled. Keep feeders clean and provide enough access for smaller or less dominant birds.

Fresh, accessible water belongs in every feeding plan. Check drinkers daily, including their flow and whether the birds can reach them. Water problems become especially important during hot weather, when birds’ needs increase.

Frequently asked questions

Can laying hens eat broiler feed?

It should not be their sole long-term ration because it generally contains too little calcium for laying. Use a feed formulated for egg production.

Can meat chickens eat layer feed?

Layer feed is unsuitable as their routine growing diet. Its calcium level is designed for eggshell production and can be harmful to growing birds.

Does extra protein make hens lay more eggs?

Only correcting a genuine dietary shortfall is likely to help. Egg production also depends on maturity, health, light, environment and the balance of the whole ration. More protein alone is not a dependable solution.

Are oyster shell and grit the same thing?

No. Oyster shell supplies calcium. Insoluble grit helps the gizzard grind suitable foods such as whole grains. They have different jobs and are not interchangeable.

At ASK A VET™, we encourage feeding decisions that start with the bird’s age, purpose and health. If you are unsure whether a ration suits your flock, keep the feed label and production records handy when seeking tailored advice.