Adult chickens can safely eat 10 to 15 dried mealworms per bird per day. That keeps mealworms within the standard treat guideline of no more than 10% of a chicken’s total daily diet. Going over that threshold regularly can cause nutritional imbalances, particularly a calcium shortfall that affects egg quality.
Why the 10% Rule Matters
Dried mealworms are roughly 53% protein and 28% fat, which makes them nutrient-dense but lopsided compared to a complete layer feed. They’re low in calcium and have a calcium-to-phosphorus ratio of roughly 0.07 under normal conditions. Laying hens need a lot of calcium to form strong eggshells, and too many mealworms can tilt the mineral balance toward phosphorus, which actually interferes with calcium absorption. The result over time is thinner shells and potentially weaker bones.
Think of mealworms as a protein-rich dessert, not a meal replacement. Your flock’s layer feed is formulated to deliver the right balance of energy, vitamins, and minerals. Mealworms supplement that diet; they don’t substitute for it.
Dried vs. Live Mealworms
Live mealworms are about 62% water, so their protein and fat are diluted compared to dried ones. A live mealworm is roughly 20% protein and 13% fat. Dried mealworms pack more than double the protein per gram because the moisture has been removed. That means you’d need to offer roughly two to three times as many live mealworms to deliver the same nutritional punch as dried ones.
Dried mealworms also last much longer in storage. Fresh larvae spoil quickly because their high water content encourages microbial growth. Drying preserves them for weeks or months without refrigeration, which is why most backyard flock owners stick with the dried form. One small downside: the drying process can reduce how well chickens absorb certain minerals like zinc, though this is a minor concern when mealworms are a small fraction of the diet.
Adjusting for Molting Season
Feathers are about 85% protein, so molting chickens burn through protein reserves quickly. During a molt, your birds benefit from higher-protein treats, and mealworms are one of the best options. Even so, the 10% treat ceiling still applies. The better strategy is to switch your flock to a higher-protein base feed (sometimes labeled “all-flock” or “feather fixer”) during molting and use mealworms as a targeted supplement rather than the sole protein boost.
Amino acids like lysine and methionine are especially important for feather regrowth. Mealworms contain both, which is part of why they’re a better molting treat than, say, scratch grains or bread.
Feeding Mealworms to Chicks
Chicks can start eating small mealworms as early as one to two weeks old. Hen-raised chicks naturally encounter insects at this age when their mother forages. The soft body of a mealworm is easier for a young chick to digest than grains or grasses, but you should still make chick-sized grit available. Grit helps the gizzard grind food, and while it’s less critical for soft insects than for hard seeds, having it on hand lets chicks pick it up when they need it. Some experienced keepers recommend waiting until chicks are at least a week old before introducing grit, since very young gizzards are still developing.
Start with one or two small mealworms per chick and watch how they handle them. Chick starter feed should remain the primary diet. Treats of any kind for chicks should be even more limited than for adults, since the starter formula is carefully balanced for growth.
How to Offer Them
Scattering mealworms across the ground or into bedding is far more beneficial than dumping them in a pile. Research on broiler chickens found that scattered dried mealworms triggered significantly more foraging behavior than other scattered feed items. In the hour after scattering, birds spent over 50% of their time foraging, with about 37% of that time actively scratching and searching. That’s a dramatic jump compared to their baseline activity levels.
This matters because foraging is a core natural behavior for chickens. When they can’t express it, they’re more likely to develop problem behaviors like feather pecking. Scattering mealworms essentially turns a treat into an enrichment activity. The foraging spike does taper off after the first hour as the visible mealworms get eaten, so if enrichment is your goal, you can scatter small amounts at different times rather than giving the full daily portion at once.
Balancing Calcium
Because mealworms are calcium-poor, always keep a separate dish of oyster shell or crushed limestone available for your laying hens. This lets each bird self-regulate her calcium intake. Free-choice calcium is especially important if you’re feeding mealworms regularly, since even a modest daily serving shifts the calcium-to-phosphorus balance slightly.
Interestingly, research has shown that mealworms raised on high-calcium feed can reach a calcium-to-phosphorus ratio of 1.31, which is a massive improvement over the typical 0.07 ratio. Some specialty suppliers “gut-load” their mealworms with calcium-rich diets before selling them. If you raise your own mealworms, feeding them a high-calcium diet for at least 48 hours before harvesting can meaningfully improve their mineral profile for your flock.
Quick Reference by Flock Size
- 3 hens: 30 to 45 dried mealworms per day total
- 6 hens: 60 to 90 dried mealworms per day total
- 12 hens: 120 to 180 dried mealworms per day total
A standard bag of dried mealworms contains thousands, so even at 15 per bird, a small flock won’t go through them quickly. Store dried mealworms in a cool, dry place with the bag sealed to prevent moisture and pantry pests. Refrigeration extends shelf life further but isn’t strictly necessary.