Chicken By-Products
Last updated: February 17, 2026
Table of Contents
Quick Summary
Chicken by-products are the non-rendered, non-muscle-meat parts of slaughtered chickens — primarily organ meats (liver, heart, kidneys), plus heads and feet. According to AAFCO, the definition requires these parts to be clean and free from fecal matter. They are species-specific (chicken), which is an advantage over generic ingredients like meat meal, but the label doesn't specify which parts are actually included. The nutritional value ranges from excellent (if mostly organs) to moderate (if mostly heads and feet). Named organ ingredients are always more transparent.
What It Is
The AAFCO definition of chicken by-products is: "the non-rendered, clean parts, other than meat, derived from slaughtered chickens. It consists of heads, feet, viscera, free from fecal content and foreign matter, except in such amounts as might occur unavoidably in good factory practice." The key phrase is "other than meat" — by-products explicitly exclude the skeletal muscle meat that makes up what we typically think of as "chicken." What's included is everything else: organ meats (liver, heart, kidneys, lungs, spleen), plus heads and feet.
Chicken by-products are fresh, not rendered. Unlike chicken meal or chicken by-product meal, the water has not been removed. This is why fresh by-products can appear high on an ingredient list — they weigh more per unit of protein contributed, because water makes up a significant portion of their mass.
Feathers are specifically excluded from the chicken by-products definition (they fall under a separate AAFCO definition as "poultry by-product"). Fecal content and foreign matter must be absent by AAFCO standards, addressing a common misconception that by-products include waste material.
By-Products vs. Named Ingredients
The main limitation of chicken by-products on a label is that you don't know the composition — how much is liver (nutrient-dense) vs. how much is feet (mostly collagen and bone). Compare this to named ingredients:
- vs. Chicken liver: Chicken liver specifies the exact organ — one of the most nutrient-dense foods in a dog's diet, rich in vitamin A, B12, iron, and complete protein. "Chicken by-products" might include liver, or it might not. Named organ meats eliminate that ambiguity entirely.
- vs. Chicken heart: Chicken heart is a named muscle organ, high in taurine and CoQ10. Again, by-products may or may not include heart — you cannot tell from the label. If by-products are listed but chicken heart is not named separately, the formula's taurine contribution is unknown.
- vs. Chicken meal: Chicken meal is rendered (dried), so it's a concentrated protein source — roughly 60–65% protein vs. 15–20% for fresh by-products. Chicken meal must be made from flesh and skin (with or without bone) and excludes many of the parts included in by-products. Meal and by-products are distinct ingredients from different parts of the animal.
- vs. poultry by-product meal: The rendered (dried) version of chicken by-products. Poultry by-product meal is concentrated protein (55–60%) but still doesn't specify species within "poultry" (could be chicken, turkey, or duck). Chicken by-products at least specify species.
Why It's Used in Dog Products
Chicken by-products are common in wet food and canned formulas for several reasons:
- Cost-effective protein source — organ meats and other parts cost less than prime muscle meat
- High moisture content makes them practical for wet food formulas
- Organ meats are genuinely nutrient-dense — liver in particular is among the most nutritious foods available, and manufacturers can legitimately claim nutritional value
- Mirrors a more natural diet — wild canids eating whole prey consume organs and non-muscle parts routinely
- AAFCO-compliant and well-understood by regulators — no labeling ambiguity about what the ingredient category includes
Nutritional Value
Chicken by-products have genuinely variable nutritional value depending on composition:
If Organ-Heavy
- Liver: Exceptionally rich in vitamin A, B12, folate, iron, zinc, and copper. Complete, highly digestible protein.
- Heart: High in taurine, CoQ10, B vitamins, and iron. Technically a muscle organ with protein density closer to muscle meat.
- Kidneys: Good source of B vitamins, iron, zinc, and selenium.
- Lungs and spleen: Lower nutrient density but still provide useful protein and some vitamins.
If Head/Feet-Heavy
- Heads: Primarily skin, bone, and some organ material. Lower protein quality, some calcium from bone.
- Feet: High in collagen and gelatin (good for joint health), some calcium from bone. Not a high-protein ingredient.
The key point: organ-rich by-products are nutritionally valuable; head-and-feet-heavy by-products are not. The label doesn't tell you which you're getting.
Quality Considerations
When evaluating a food containing chicken by-products, look at the surrounding ingredient list for clues about formulation quality. If specific organs (chicken liver, chicken heart) are listed alongside "chicken by-products," the manufacturer is at least partially transparent about what's included. If "chicken by-products" is the only protein source listed, you're relying entirely on the manufacturer's sourcing standards.
Chicken by-products include genuinely nutritious organ meats — but also heads and feet of lower nutritional value. The label doesn't specify the ratio. Premium manufacturers who use organ meats for nutritional value will typically name them (chicken liver, chicken heart) rather than hiding them under the by-products umbrella.
Potential Concerns
- Composition opacity: You don't know if you're getting nutrient-dense organs or lower-value parts. Recipe composition can shift batch to batch.
- Allergen management: Chicken by-products still contain chicken proteins — dogs with chicken allergies will react. However, because the protein sources are less varied than in truly generic ingredients, allergen management is at least possible (avoid anything with chicken).
- Taurine uncertainty: If the formula relies heavily on heads and feet rather than heart and other muscle organs, taurine content may be lower than expected. This matters particularly for large breed dogs and breeds with known DCM risk.
- Quality control variability: Lower-tier manufacturers may use by-products as a cost-minimisation strategy, selecting whatever parts are cheapest. Premium manufacturers using by-products for their organ-meat nutritional value will typically advertise this and name the specific organs.
How to Spot on Labels
On ingredient lists, you'll see "chicken by-products" — this specific phrase. Related ingredients to watch for:
- "Chicken by-product meal" — the rendered/dried version (higher protein concentration)
- "Poultry by-products" — the same category but species unspecified (less transparent)
- "Chicken liver," "chicken heart," "chicken kidney" — named organs (more transparent, preferable)
- "Chicken" (without "by-products") — muscle meat only, no organ material
Chicken by-products appear frequently as the second or third ingredient in canned/wet dog foods, where fresh ingredients list high due to water weight. In this context, "chicken, chicken by-products" as the first two ingredients typically means a chicken muscle meat + organ mix — potentially a good formula if the manufacturer sources quality organ material.
Scientific Evidence
Chicken by-products provide complete protein with essential amino acids comparable to muscle meat when organ-heavy. Digestibility varies based on composition — organ meats (liver, heart, kidneys) are highly digestible (80-90%), while heads and feet have lower digestibility due to cartilage and bone content. Studies on organ meat nutrition confirm liver provides exceptional bioavailable iron, vitamin A (as retinol), and B12. Chicken heart is rich in taurine, critical for canine cardiac health. However, the variable composition of "chicken by-products" means nutritional value is inconsistent batch-to-batch. Safety is established by AAFCO standards requiring freedom from fecal content and foreign matter, making properly processed chicken by-products safe for consumption.
Evidence Level: Strong for safety and protein quality when organ-heavy. Moderate for consistency due to variable composition. Digestibility ranges 70-90% depending on organ-to-extremity ratio.
Chicken by-products aren't the bogeyman pet food marketing sometimes makes them out to be — liver and heart are excellent nutrition. But the label doesn't tell you what's actually in there. We prefer named organ ingredients: chicken liver, chicken heart, chicken kidney. If a manufacturer is proud of their organ-meat sourcing, they name it. "By-products" is a catch-all that leaves too much to chance.
Frequently Asked Questions
Are chicken by-products bad for dogs?
Not automatically. Chicken by-products include organ meats like liver, heart, and kidneys — which are among the most nutritious parts of the chicken — as well as lower-value parts like heads and feet. The problem isn't that by-products are inherently harmful; it's that the label doesn't tell you which parts are actually included. A by-product-heavy food could be nutrient-dense (mostly organs) or moderate (mostly heads and feet). Named organ ingredients like "chicken liver" or "chicken heart" are always preferable because they remove the uncertainty.
What exactly are chicken by-products?
According to AAFCO, chicken by-products are "the non-rendered, clean parts, other than meat, derived from slaughtered chickens." This includes heads, feet, viscera (internal organs), and organ meats like liver, heart, kidneys, and lungs. It must be free from fecal content and foreign matter. Notably, it does NOT include feathers, which are covered by a separate AAFCO definition. Chicken by-products are fresh (not rendered), which is why they often appear high on ingredient lists — fresh ingredients contain significant water weight.
What's the difference between chicken by-products and chicken by-product meal?
Chicken by-products are fresh — they retain their natural moisture. Chicken by-product meal is rendered: cooked at high temperatures, moisture removed, and dried into a concentrated powder (roughly 55–60% protein). Because by-products are listed by pre-processing weight (which includes water), they appear higher on ingredient lists than their actual protein contribution suggests. By-product meal, listed at its dry weight, provides a more accurate picture of its protein contribution. Both come from the same range of parts — the distinction is fresh vs. rendered.
Is chicken with by-products lower quality than chicken-only food?
Not necessarily. The presence of by-products doesn't automatically indicate lower quality — many whole-prey and raw diet advocates argue that organ meats (liver, heart, kidneys) are more nutrient-dense than muscle meat alone. The quality question is really about transparency: does the label tell you which by-products are included? It doesn't. A food listing "chicken, chicken by-products" could range from excellent (chicken muscle meat plus organ meats) to moderate (chicken muscle meat plus heads and feet). Named ingredients always tell a clearer story.
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