Making your own broiler feed comes down to matching the right protein and energy levels to each growth phase, then choosing ingredients that hit those targets at a reasonable cost. Broilers grow fast, reaching market weight in as little as 6 to 8 weeks, and their nutritional needs shift significantly during that time. Getting the formula wrong by even a few percentage points of protein can slow growth and waste money on feed that doesn’t convert efficiently to meat.
The Three Growth Phases
Broiler nutrition is divided into starter, grower, and finisher stages. Each phase requires a different balance of protein and energy, and feeding the wrong phase at the wrong time is one of the most common mistakes in home mixing.
Starter (days 0 to 10): 23% crude protein, approximately 2,975 kcal of energy per kilogram of feed. Chicks are building muscle and bone rapidly, so this phase demands the highest protein level.
Grower (days 11 to 24): 21.5% crude protein, approximately 3,050 kcal/kg. Protein drops slightly while energy increases, reflecting the shift from pure tissue building to overall body growth.
Finisher (day 25 to market): 19.5% crude protein, approximately 3,100 kcal/kg. If you’re raising birds to a heavier market weight (above 4.4 lb), you can drop protein further in later finisher stages, down to 18% or even 17% for birds kept past 7 weeks, while nudging energy up to around 3,150 kcal/kg.
The pattern is straightforward: protein goes down as the bird ages, energy goes up. Younger birds need more protein to build muscle tissue. Older birds need more energy to maintain that mass and add finishing weight efficiently.
Core Ingredients and What They Contribute
Most broiler feeds are built on two foundations: a grain for energy and a protein source. Whole maize (corn) is the standard energy ingredient, providing around 8 to 9% crude protein and plenty of metabolizable energy. Soybean meal is the most widely used protein source, typically running 44 to 48% crude protein. Together, these two ingredients form the backbone of nearly every commercial broiler ration.
Beyond those two, a complete feed needs:
- Fishmeal adds high-quality protein (60 to 65%) plus amino acids that plant proteins lack. It’s particularly valuable in starter rations.
- Limestone or oyster shell provides calcium for bone development. A typical inclusion is around 4 to 6% of the total mix.
- Vitamin-mineral premix covers the micronutrients that grains and protein meals don’t supply in sufficient amounts. Standard inclusion is about 0.3% of the total feed (3 kg per tonne).
- Synthetic amino acids (lysine, methionine, threonine) fine-tune the protein quality. Plant-based protein sources are often deficient in methionine, and adding small amounts of pure amino acids is far cheaper than increasing the total protein level.
A Practical Starter Recipe
A widely used broiler starter formula for a 70 kg batch looks like this: 40 kg whole maize, 14 kg soybean meal, 12 kg fishmeal, 4 kg limestone, 35 g lysine, 35 g threonine, and 70 g vitamin-mineral premix. This gets you into the range of 23% crude protein needed for the first 10 days.
To adapt this for grower and finisher phases, you increase the proportion of maize and reduce the fishmeal and soybean meal. For a finisher ration, you might push maize up to 60% or more of the total, while cutting fishmeal down or out entirely and reducing soybean meal accordingly. The exact proportions depend on the protein content of your specific ingredients, which brings us to how you calculate the blend.
Balancing Protein With the Pearson Square
The Pearson Square is a simple math tool that tells you how much of each ingredient you need to hit a target protein level. You don’t need software or a nutrition degree to use it.
Here’s how it works. Draw a square. Write your target protein percentage in the center (say, 21.5% for a grower feed). Write the protein content of your energy source (corn at 8.5%) at the top left corner and your protein source (soybean meal at 44%) at the bottom left. Subtract diagonally across the square, always taking the smaller number from the larger. Top right: 21.5 minus 8.5 = 13 (this is your parts of protein source). Wait, it’s actually the diagonal: 44 minus 21.5 = 22.5 at the top right (parts of corn), and 21.5 minus 8.5 = 13 at the bottom right (parts of soybean meal).
Add the two results: 22.5 + 13 = 35.5 total parts. Corn makes up 22.5/35.5 = 63.4% of your mix, and soybean meal makes up 13/35.5 = 36.6%. For a 100 kg batch, that’s roughly 63 kg corn and 37 kg soybean meal. One important rule: the Pearson Square only works when your target number falls between the protein values of the two ingredients. If both ingredients are above or both below your target, the math breaks.
This gives you a two-ingredient base. In practice, you then replace a portion of the soybean meal with fishmeal, add your limestone, premix, and amino acids on top, and recalculate to make sure the final protein percentage still hits your target.
Amino Acids That Matter Most
Crude protein percentage is just the starting point. What really drives growth is the amino acid profile, particularly lysine and methionine. Lysine is the first limiting amino acid in most grain-based diets, meaning it runs out before anything else and caps the bird’s growth. Methionine (combined with cysteine) is the second.
For a starter diet, the target for digestible lysine is around 13 g per kilogram of feed. The optimal ratio of methionine plus cysteine to lysine is about 75 to 76%, meaning you need roughly 9.8 g/kg of combined methionine and cysteine. A diet based on corn and soybean meal alone will fall short on methionine, so adding a small amount of synthetic methionine (a few grams per kilogram) is standard practice. Synthetic lysine and threonine cover the remaining gaps at very low cost.
Skipping these amino acid supplements is one of the biggest mistakes in home feed mixing. Without them, you’d need to add much more total protein to compensate, which is both expensive and inefficient.
Cheaper Protein Alternatives
Soybean meal and fishmeal are effective but can be expensive depending on your region. Several alternatives work well at partial or full replacement levels.
Insect meal, particularly from black soldier fly larvae, contains 40 to 60% crude protein and can replace 10 to 15% of the total broiler diet without affecting growth. Studies have shown improvements in carcass quality and protein efficiency when insect meal replaces up to 25% of fishmeal. Canola meal is another common substitute, though its protein is slightly lower than soybean meal. Sunflower cake and cottonseed meal are regionally available options, though they require careful handling due to anti-nutritional factors.
If you have access to local protein sources, test their crude protein content (many agricultural extension offices will do this for a small fee) and plug the numbers into your Pearson Square calculation. The math works the same regardless of the ingredient.
Feed Form: Mash, Crumble, or Pellet
How you process the feed matters almost as much as what’s in it. Research consistently shows that crumble and pellet forms produce better weight gain and feed conversion than mash (loose, flour-like feed). In one study, crumble-pellet diets improved both body weight and feed conversion ratio at every week measured, with the difference being highly significant statistically.
Pellets reduce feed waste because birds can’t pick through and select only their favorite ingredients. They also eat faster, spending less energy on the act of feeding itself. For small-scale producers without a pellet mill, crumbles are a good middle ground. You can make a basic crumble by adding a small amount of moisture to mash feed, pressing it, and breaking it into small pieces. If you’re stuck with mash, it still works, but expect your birds to need roughly 5 to 10% more feed to reach the same weight.
Storage and Moisture Control
Homemade feed spoils faster than commercial feed because it typically lacks preservatives. The biggest risk is mold, which can produce aflatoxins that are toxic to poultry even in small amounts.
Keep the moisture content of your finished feed at 10% or below. Cereals store well at 10 to 12% moisture, but mixed feeds with fishmeal or other high-moisture ingredients can creep above safe levels quickly. Mold-producing fungi begin growing at moisture levels above 15%, and some mycotoxin-producing species can grow at moisture levels as low as 9 to 10%. Store feed in a cool, dry location with good airflow. Sealed containers or bags with moisture barriers work best. Mix only what you’ll use within one to two weeks, especially in hot or humid climates.
Water Alongside Feed
Broilers drink roughly 1.6 to 2.0 times as much water as they eat feed, by weight. A bird eating 150 g of feed per day needs 240 to 300 mL of water. Young chicks tend toward the higher end of that ratio (around 1.9:1 at 11 days old), while older birds settle closer to 1.7:1 by six weeks.
Heat changes everything. Water consumption at 35°C (95°F) is double what it is at 21°C (70°F). In summer months, the water-to-feed ratio averages around 1.84:1, compared to 1.72:1 in winter. If your birds aren’t drinking enough, they won’t eat enough either, and growth stalls. Clean, cool water available at all times is just as important as getting the feed formula right.