The single biggest dietary factor in egg production is protein. A laying hen needs roughly 16 to 20 percent crude protein in her daily feed, with younger hens at peak lay requiring the higher end of that range. But protein is only part of the picture. Calcium, hydration, specific supplements, and even the pigment-rich scraps you toss into the run all play measurable roles in how many eggs your hens lay and how good those eggs are.
Protein: The Foundation of Egg Production
An egg is mostly protein and water, so a hen’s diet needs to reflect that. During peak production (roughly 19 to 32 weeks of age), hens perform best on feed containing about 19 to 20 percent crude protein. As they age, the requirement drops gradually: around 17 percent from 32 to 55 weeks, and 16 percent after that. Most commercial layer feeds are formulated in this range, but if you’re mixing your own ration or supplementing with scratch grains (which are low in protein), you can easily dilute the protein content below what your flock needs.
High-protein foods you can add to boost intake include cooked eggs (yes, feeding eggs back to hens is common and safe), mealworms, sunflower seeds, and fish meal. Soybeans are the standard protein base in commercial feed for good reason: they offer a complete amino acid profile that closely matches what hens need for egg formation.
Insect Protein as a Supplement
Black soldier fly larvae have gained popularity as a protein-rich treat, and research backs their value. In a study on White Leghorn hens, birds fed diets containing 7.5 percent dried black soldier fly larvae maintained egg production rates comparable to hens on a standard corn-soybean diet (about 88 to 89 percent daily production). One notable benefit: hens eating insect larvae produced eggs that were significantly more uniform in size, which matters if you sell eggs. You don’t need to replace a large portion of feed. A handful of dried larvae scattered in the run or mixed into feed a few times a week adds protein variety without disrupting the nutritional balance.
Calcium and Shell Strength
A hen pulls about 2.2 grams of calcium from her body to form a single eggshell. If she doesn’t replace that calcium through food, shell quality drops fast, and eventually she’ll slow or stop laying altogether. Layer feed typically contains 3.3 percent calcium, but offering a separate source of free-choice calcium lets individual hens eat more when they need it.
Crushed oyster shell is the gold standard supplement because it dissolves slowly in the digestive tract, providing a steady release of calcium during the overnight hours when shell formation happens. Crushed eggshells work too, though you should bake them first to sanitize and make them unrecognizable (so hens don’t develop a taste for eating their own eggs). Limestone grit is another option. The key is keeping phosphorus in balance. Layer diets typically contain about 0.48 percent total phosphorus, and too much phosphorus interferes with calcium absorption. Avoid feeding large amounts of raw bran or unprocessed grains, which are high in phosphorus relative to calcium.
Water Matters More Than You Think
On days when a hen forms an egg, she drinks more than double the water she consumes on non-laying days: roughly 255 grams compared to 115 grams. The finished egg contains only about 32 grams of water, meaning most of that extra intake supports the metabolic demands of egg formation rather than the egg itself. Researchers have described this as a considerable metabolic stress, which explains why even brief water shortages can cause an immediate drop in laying.
Clean, cool water available at all times is non-negotiable. In hot weather, hens drink even more. If your waterers run dry for even a few hours during the day, you’ll likely see the effects in your egg count within 24 to 48 hours. Adding electrolytes to water during heat waves can help, but the simplest fix is always having enough waterers so every hen can drink without competition.
Fermented Feed for Better Absorption
Fermenting your regular chicken feed in water for two to three days before serving it can improve how much nutrition your hens actually extract from the same ingredients. The fermentation process breaks down compounds in grains that normally block nutrient absorption, and it makes minerals like phosphorus more available. According to North Carolina State University’s cooperative extension program, hens fed fermented feed can lay bigger eggs with stronger shells and better overall quality.
The process is simple: soak your regular feed in a container of water, stir daily, and feed it once it smells mildly sour (like yogurt, not rotten). One thing to watch for is that fermentation can degrade certain amino acids, particularly lysine and threonine, if the process runs too long or isn’t managed well. Keeping fermentation to about 48 to 72 hours and using fresh batches avoids this problem.
Greens, Vegetables, and Kitchen Scraps
Leafy greens like kale, spinach, Swiss chard, and lettuce provide vitamins A and K along with small amounts of calcium. Hens that free-range on diverse pasture tend to produce eggs with richer, more orange yolks, and you can replicate that effect with targeted feeding.
Alfalfa is one of the most effective greens for egg quality. It’s high in protein for a plant (around 15 to 20 percent when dried), provides calcium, and contains natural pigments called xanthophylls that deepen yolk color. You can offer it as hay, pellets, or fresh sprouts. Marigold petals work similarly. The lutein extracted from marigolds is widely used in commercial poultry feed specifically because it enhances yolk pigmentation. If you grow marigolds, tossing spent flower heads into the coop is a free way to get deeper golden yolks.
Other beneficial kitchen scraps and garden additions include cooked squash and pumpkin (both rich in beta-carotene), watermelon rinds (hydration plus nutrients), cabbage, broccoli, and peas. Cooked sweet potatoes are a good energy source during cold months when hens burn more calories maintaining body temperature.
Flaxseed and Omega-3 Enrichment
Adding flaxseed to your hens’ diet won’t necessarily increase the number of eggs, but it meaningfully changes what’s inside them. Research published in Lipids in Health and Disease found that supplementing hen diets with up to 20 percent extruded flaxseed meal produced maximum levels of omega-3 fatty acids in the yolk, specifically alpha-linolenic acid and DHA. For backyard flock owners, you don’t need to hit 20 percent precisely. Mixing a tablespoon or two of ground flaxseed per hen into the daily feed a few times a week will shift the fatty acid profile of your eggs toward more omega-3s. Whole flaxseeds pass through largely undigested, so grinding or buying pre-milled flax is important.
Chia seeds work on the same principle, though they’re typically more expensive. Fish meal is another omega-3 source, but use it sparingly because too much can give eggs a fishy taste.
Foods That Hurt Egg Production
Some common foods actively suppress laying or harm your flock. Avocado skin and pits contain persin, which is toxic to chickens. Raw, dried beans contain a compound called lectin that can be fatal in small amounts (cooked beans are fine). Chocolate and caffeine are toxic. Onions in large quantities can cause anemia. Salty foods disrupt the water balance hens rely on for egg formation, and since hydration is so critical to laying, excess salt has an outsized effect.
Lead exposure, which can happen when chickens peck at old paint, contaminated soil, or certain hardware, causes muscle weakness, appetite loss, weight loss, and complete cessation of egg production. If your coop or run contains older structures, check for peeling lead paint.
Too many low-protein treats are a subtler problem. Scratch grains, bread, rice, and pasta are all low in protein relative to layer feed. If treats make up more than about 10 percent of your flock’s daily intake, you’re effectively diluting their protein below what’s needed for consistent laying.
Light Exposure Drives the Laying Cycle
No food can fully compensate for insufficient light. Hens need about 15 to 16 hours of continuous light per day to maintain strong egg production. During winter months, when natural daylight falls well below that threshold, production drops or stops entirely in many breeds. Adding a simple light on a timer in the coop to extend “daylight” to about 17 hours per day keeps the hormonal cycle that triggers ovulation running through the shorter days. The light doesn’t need to be bright; a standard 25 to 40 watt bulb is enough for a small coop. Set it to turn on early in the morning rather than extending the evening, so hens can still roost naturally at dusk.