“Soy-free” and “corn-free” both appear on premium feed bags, and they're often mentioned together. But they describe two different things being removed from your animals' diet — and the reasons you'd choose one over the other are different. Here's a practical breakdown.
What Is Soy in Livestock Feed?
Soybean meal is the most common protein source in conventional livestock and poultry feed. It's high in crude protein (47–48%), readily available, and cheap. Over 94% of soybeans grown in the U.S. are GMO varieties (primarily Roundup Ready), so conventional soy feed = GMO soy by default unless the label says otherwise.
The reasons farmers remove soy from their animals' diet:
- Phytoestrogens: Soybeans contain phytoestrogens (isoflavones) — plant-based compounds that weakly mimic estrogen. Some poultry producers report that soy-free feed affects yolk color and characteristics. The research is ongoing, but enough producers notice a difference to make soy-free feeds a meaningful niche.
- Allergen concerns: Soy is one of the major food allergens. Consumers whose families have soy allergies sometimes choose soy-free animal products — eggs, pork, poultry — as a precaution.
- GMO avoidance: For keepers who want to eliminate GMO ingredients entirely, removing soy is often the bigger step (since Non-GMO corn exists and is more commonly available than Non-GMO soy).
- Digestive sensitivity: Some individual animals tolerate non-soy protein sources better than soybean meal — this is more commonly observed in dogs and pigs.
What Is Corn in Livestock Feed?
Corn is the primary energy source in most conventional livestock feed. It's high in starch (energy), palatable, and extremely cheap. Over 90% of U.S. corn is GMO. In a standard layer pellet, corn typically accounts for 40–60% of the formula.
The reasons farmers remove corn from their animals' diet:
- GMO avoidance: Same as soy — Non-GMO corn exists but is less common and more expensive. Removing corn entirely avoids the sourcing question.
- Digestive issues: Some producers, particularly with heritage breed pigs and certain poultry, report better digestive health on lower-starch diets. Corn is also linked to softer fat in some finishing contexts.
- Yolk color: Corn pigments (xanthophylls) contribute to yolk color. A corn-fed hen tends to have more yellow-orange yolks from the corn pigment. A corn-free diet sometimes produces paler yolks unless other pigment sources (like marigold, alfalfa) are included — or surprisingly deeper orange yolks if the free-range diet is rich in other carotenoids.
- Grain allergy avoidance (dogs): Corn is a common ingredient in cheap dog food and is linked to digestive issues and food sensitivities in some dogs.
Key Differences
| Factor | Soy-Free | Corn-Free |
|---|---|---|
| What it removes | Soybean meal as protein source | Corn as primary energy source |
| Replaces with | Peas, insects, peanut meal, fishmeal, other legumes | Milo/sorghum, barley, peas, peanuts, or other energy grains |
| Primary reason to choose | Phytoestrogen concerns, allergen avoidance, GMO elimination | GMO avoidance, digestive concerns, specialty finishing |
| Availability | More available — several brands offer it | Rare — very few conventional brands offer it |
| Price premium | Moderate — pea and insect protein cost more than soy | Higher — peanut/specialty grain blends are more expensive |
What We Carry at BooneTop
We stock one of the most complete soy-free and corn-free lineups in Middle Tennessee, primarily through Hillsboro Feed Company's peanut-based formulas:
- Hillsboro 16% No Corn No Soy Pelleted Feed — For layers and growers. Peanut-based. Removes both corn and soy simultaneously. Very rare formula even among premium brands.
- Hillsboro 22% Soy Free Crumbled Starter — For chicks and broilers. Soy-free but uses corn for energy.
- Hillsboro 22% Soy & Corn Free Crumbled Starter — Removes both. Peanut-based.
- Hillsboro 25% Soy & Corn Free Quail, Turkey & Duck Feed — The only no-corn-no-soy option we're aware of for waterfowl and turkeys.
- Hillsboro 16% No Corn No Soy Hog Pellets — Our #1 selling hog feed. Pastured pork producers love this one.
- KOFFI Soy Free Layer 16%, Soy Free Broiler, Soy Free Swine Grower — All USDA Certified Organic, soy-free but may contain organic corn.
- Kalmbach Henhouse Reserve Love Bug™ — Soy-free layer feed using insects and flaxseed as protein/fat sources. Contains Non-GMO corn.
Which One Should You Choose?
If your primary goal is eliminating GMOs — start with any Non-GMO Project Verified feed. The GMO status of corn and soy is the biggest practical difference between premium and conventional feed for most operations.
If you want to remove soy specifically — look for soy-free options from Hillsboro (peanut-based), Kalmbach (Henhouse Reserve, Goat Granola), or KOFFI.
If you want to remove both corn and soy — Hillsboro's peanut-based line is essentially the only option at our price point that does this completely. It's genuinely rare in the industry.
Text or call us at 931-217-5556 — we'll confirm what's in stock and help you match the right formula to what you're trying to accomplish. See also our brand comparison page and the full chicken feeding guide.