Canola meal is the high-protein byproduct left over after oil is extracted from canola seeds. It contains 25 to 30% crude protein on a dry-weight basis and serves as the second most widely used plant-based protein ingredient in animal feed worldwide, behind soybean meal. Farmers and feed formulators rely on it to supply affordable protein to dairy cattle, poultry, pigs, and farmed fish.
How Canola Meal Is Made
Canola meal is produced through a process called prepress solvent extraction. After harvested canola seeds are cleaned, they go through preconditioning and flaking, which breaks down cell walls to make the oil accessible. The flakes are then cooked and mechanically pressed to squeeze out a portion of the oil. What remains, called press-cake, still contains residual oil that gets removed using a solvent. A final step of heating and toasting drives off any remaining solvent and produces the finished meal, a crumbly, pale-yellow product ready for feed formulation.
The entire process yields two commercial products: canola oil for human consumption and canola meal for animal nutrition. Because oil extraction is the primary economic driver, canola meal is relatively inexpensive compared to purpose-grown protein crops, which is a major reason it shows up in so many feed rations around the world.
Nutritional Profile
Canola meal’s protein content of 25 to 30% is lower than soybean meal’s 32 to 44%, but it offers a well-balanced amino acid profile with high levels of glutamine, arginine, and leucine. Unlike sunflower meal, canola meal is not deficient in lysine, an essential amino acid that limits growth in many livestock species. Its sulfur-containing amino acids tend to be somewhat lower, likely because industrial oil extraction alters them during processing.
One important difference from soybean meal is fiber. Canola meal contains roughly 32% neutral detergent fiber on a dry matter basis, about three times the 9% found in soybean meal. That extra fiber, largely from the seed hull, means canola meal is less energy-dense. For ruminants like cattle, which can ferment fiber effectively, this is less of a concern than it is for chickens or pigs, whose digestive systems handle fiber less efficiently.
Use in Dairy Cattle Diets
Dairy farming is where canola meal shines most convincingly. USDA research found that cows fed canola meal as their protein supplement produced an average of 88.8 pounds of milk per day, compared with 86.6 pounds for cows on soybean meal, a 2.5% advantage per cow over a 15-week trial. Milk protein output followed the same pattern, with canola-fed cows producing more protein per day. Separate research showed that milk production increased in a linear fashion as canola meal made up a larger share of the diet, up to about 24% of total dry matter intake.
Canola meal also appears to carry an environmental benefit in dairy operations. When it replaced soybean meal in lactating cow diets, methane emissions relative to energy intake dropped by 13%. That reduction came alongside a 7% increase in feed intake and a 5% increase in fat- and protein-corrected milk, meaning the cows were simultaneously more productive and less polluting per unit of milk.
Poultry and Pig Diets
Canola meal works well in poultry rations but within tighter limits than in cattle diets, because chickens are more sensitive to its higher fiber content. For broilers, research supports an inclusion window of roughly 10 to 30% of the diet. Birds fed up to 30% canola meal showed no significant difference in feed conversion ratio compared to controls, even under heat stress conditions. Push above 30 to 40%, though, and growth rates and feed efficiency start to decline, likely from amino acid imbalances and reduced nutrient absorption caused by the fiber.
Laying hens tolerate canola meal well at 15 to 20% of the diet without any drop in egg production or egg quality. Studies using cold-pressed canola meal at 20% in layer diets confirmed no adverse effects on performance. Going much above 20% approaches the practical safety threshold for layers.
Canola meal is also used successfully in pig diets, though specific maximum inclusion rates are less firmly established in the literature than for poultry. Its balanced amino acid profile makes it a practical partial replacement for soybean meal in swine rations.
Use in Aquaculture Feed
Canola meal (sometimes labeled rapeseed meal in global markets) is the second most common plant-based ingredient in aquaculture feed. Its amino acid profile resembles soybean meal closely enough to serve as a partial replacement for fishmeal, the traditional but increasingly expensive and ecologically constrained protein source in fish diets.
How much fishmeal canola meal can replace depends heavily on the fish species. Rainbow trout handled diets where up to 66% of fishmeal was swapped for canola meal with no measurable impact on growth rate, weight gain, or survival. European sea bass showed no adverse effects on growth or feed efficiency at moderate inclusion levels. Nile tilapia tolerated 50% replacement of fish and soybean meal without growth penalties, but performance dropped at 75%. Siberian sturgeon performed well with up to 30% fishmeal replacement, while black carp showed reduced growth above 20%.
The general takeaway is that canola meal can replace 10 to 66% of fishmeal depending on species, with most fish performing well somewhere in the middle of that range. More concentrated canola protein products, where fiber and other compounds are further removed, can push replacement rates even higher, up to 100% in some trials.
How It Differs From Old Rapeseed Meal
Canola is a specific variety of rapeseed bred to contain very low levels of two problematic compounds: erucic acid in the oil and glucosinolates in the meal. To qualify as canola, the oil must contain less than 2% erucic acid, and the meal must have fewer than 30 micromoles of glucosinolates per gram. Traditional rapeseed meal had far higher concentrations of both, which limited feed intake, disrupted thyroid function in livestock, and made the meal bitter.
Modern canola meal is safe at the inclusion rates discussed above precisely because decades of plant breeding brought those compounds down to negligible levels. If you encounter the terms “canola meal” and “rapeseed meal” used interchangeably, the distinction matters mainly for older or non-canola-quality rapeseed varieties that may still carry higher glucosinolate levels.
How Canola Meal Compares to Soybean Meal
Soybean meal remains the dominant protein supplement in animal agriculture, and for good reason: it has more protein and less fiber per unit weight. But canola meal holds its own in several important ways. Its amino acid balance is comparable, it often costs less, and in dairy cattle it consistently matches or slightly outperforms soybean meal for milk production. The lower methane emissions associated with canola meal in dairy diets add another practical advantage as producers face increasing pressure to reduce their carbon footprint.
The main disadvantage is that triple-the-fiber content. In species that handle fiber poorly, like young broiler chickens, canola meal can only go so far before it dilutes dietary energy and slows growth. For ruminants, that same fiber is largely a non-issue. Most commercial feed operations blend canola meal with other protein sources rather than relying on it exclusively, tailoring the ratio to the species, production stage, and cost of available ingredients.