Chicken by-product meal is a dry, protein-rich powder made from the parts of a chicken left over after the breast, thigh, and other cuts are removed for human consumption. These parts include organs like the liver, kidneys, lungs, and spleen, along with necks, feet, and intestines. It is one of the most common protein sources in commercial cat food, and despite its unappealing name, it delivers nutrients that cats specifically need.
What’s Actually in It
The official definition from AAFCO, the organization that sets U.S. pet food labeling standards, describes poultry by-product meal as the ground, rendered, clean parts of slaughtered poultry. That includes organs, bones, necks, feet, and undeveloped eggs. Feathers are explicitly excluded, except in trace amounts that might slip through during normal processing. Intestinal contents are also not permitted.
In practical terms, this means the ingredient is mostly organ meat and connective tissue. Liver, heart, kidneys, and spleen make up a significant portion. These are the same organs that wild and feral cats eat first when they catch prey, and they’re nutritionally dense in ways that muscle meat alone is not.
How It Differs From Chicken Meal
“Chicken meal” and “chicken by-product meal” sound similar but are legally distinct ingredients. Chicken meal is rendered from clean flesh, skin, and bone. It does not contain organs, heads, feet, or intestinal contents. Chicken by-product meal, by contrast, is built around the organ and skeletal parts that remain after the edible meat is separated for grocery stores and restaurants.
Neither ingredient is inherently better or worse. Chicken meal has a higher proportion of muscle protein. Chicken by-product meal offers a broader nutrient profile because of the organ content. Many veterinary nutritionists consider them complementary rather than competing ingredients.
Why It Matters for Cats
Cats are obligate carnivores, meaning they require certain nutrients found only in animal tissue. Taurine is the most critical example. Cats cannot produce enough taurine on their own, and a deficiency causes blindness and fatal heart disease. Organ meats are among the richest natural sources of taurine, which is one reason by-product meal works well in cat food formulas.
Research from the UC Davis School of Veterinary Medicine measured taurine levels across various animal tissues. Chicken viscera (the internal organs) contained roughly 1,004 mg of taurine per kilogram of wet weight. Chicken heart and liver together averaged even higher, at about 1,179 mg/kg. Poultry by-product meal, once dried and concentrated, tested at an average of around 3,270 mg/kg on a dry-weight basis, though individual batches ranged widely from about 1,894 to 5,352 mg/kg. That variability depends on exactly which organs end up in a given batch, which is why reputable manufacturers test their finished products rather than relying on raw ingredient estimates alone.
Beyond taurine, organ meats supply vitamin A (concentrated in liver), B vitamins, iron, and zinc in forms that are highly bioavailable to cats. Muscle meat alone doesn’t deliver these in sufficient quantities.
How It’s Made
The raw chicken parts are sent through a process called rendering. The material is cooked at high temperatures, which serves two purposes: it kills harmful bacteria like Salmonella, and it drives off moisture to create a shelf-stable powder. Validation studies have shown that heating poultry offal to at least 150°F (65.5°C) achieves a 7-log reduction in Salmonella, meaning it eliminates 99.99999% of the bacteria present. Commercial rendering typically exceeds these temperatures significantly, so the finished meal is microbiologically safe.
After cooking, the fat is separated and the remaining solids are ground into a uniform meal. The result is a concentrated protein source. Because most of the water has been removed, by-product meal contains far more protein per gram than raw chicken, which is roughly 70% water.
Not All By-Product Meals Are Equal
There’s a real quality spectrum within this single ingredient name. A 2025 study in the journal Animals compared premium and economy grades of poultry meal and found meaningful differences. High-quality by-product meal has protein content between 80 and 90% on a dry matter basis, low ash (the mineral residue from bone), and consistent digestibility above 75 to 80% when tested with standard methods. It looks uniform in color and texture.
Low-quality by-product meal can result from too little or too much heat during rendering. Under-processed meal may still contain visible feather shafts. Over-processed meal loses key amino acids, turns dark, and becomes less palatable. Economy-grade meals may also have ash content above 8%, indicating a higher bone-to-organ ratio, and more batch-to-batch inconsistency. The protein percentage on the label alone doesn’t reveal these differences, which is why the manufacturer’s quality control matters more than the ingredient name itself.
Premium cat food brands typically source higher-grade by-product meals and test each batch for digestibility and amino acid content. Budget brands are more likely to use economy-grade meals where composition varies. This is the real distinction that the ingredient list on the bag cannot tell you.
The Sustainability Angle
About 50% of every chicken processed for human food becomes leftover parts that people in most Western markets won’t buy. Without the pet food and animal feed industries, these nutrient-rich materials would become waste. Using them in cat food converts what would otherwise be an environmental burden into a functional protein source. This doesn’t make by-product meal a charity ingredient. It’s genuinely nutritious. But the waste-reduction benefit is real and worth understanding when evaluating whether “by-product” is a negative on a label or simply a description of sourcing.
Reading the Label With Context
If you see “chicken by-product meal” on your cat’s food, it tells you the product contains dried, concentrated organ and skeletal chicken parts. It does not tell you the quality of those parts, how they were processed, or what the taurine and amino acid levels actually are in the finished food. A named by-product meal (chicken, turkey) is generally preferable to a generic one (“poultry by-product meal” or “animal by-product meal”) because naming the species indicates a more controlled and traceable supply chain.
The presence of by-product meal is not, on its own, a sign of a cheap or inferior food. Many veterinary therapeutic diets use it precisely because of its organ-meat nutrient profile. The quality of the sourcing, the rendering process, and the manufacturer’s testing protocols are what separate a good by-product meal from a poor one, and those details live behind the label rather than on it.