According to research reviewed by Gram, adding a high-dose bacterial enzyme called phytase to pig feed with less calcium and phosphorus kept growth and carcass quality close to those of pigs on a fully balanced diet. The 2026 study of 250 pigs found that the best enzyme levels were about 1,250 to 1,420 FYT per kg of feed.
Gram Research analysis of a 2026 study in PLoS One looked at whether a bacterial enzyme called phytase could make up for pig feed that had less calcium and phosphorus. Researchers divided 250 young pigs into five feeding groups. Pigs fed the low-mineral diet without the enzyme grew more slowly, produced less lean meat, and used feed less efficiently than pigs on a standard diet. When the enzyme was added at higher doses, those problems were largely reversed, and growth and meat quality came close to the standard-diet results. The findings suggest that enzyme supplements may help farmers reduce mineral additives in feed without sacrificing animal growth. Because the study was done in pigs, its results do not directly apply to human diets.
Key Statistics
A 2026 randomized study of 250 pigs published in PLoS One found that adding phytase to low-calcium, low-phosphorus feed restored final body weight and lean meat percentage to levels comparable to a standard diet.
In the same 2026 study, the estimated best phytase dose for feed efficiency was 1,320 FYT per kilogram during the nursery phase and 1,404 FYT per kilogram during the growing and finishing phases.
The Quick Take
- What they studied: Can adding high doses of a bacterial enzyme called phytase to pig feed make up for reduced calcium and phosphorus, while keeping pigs healthy and growing well?
- Who participated: 250 pigs that were 21 days old and weighed about 6 kilograms (about 13 pounds) at the start. The pigs were followed from the nursery stage through growing and finishing, the stages before market.
- Key finding: Pigs fed low-mineral feed without the enzyme grew more slowly and produced less lean meat. Adding phytase brought growth and meat results close to those of pigs on a standard diet. The best enzyme doses were estimated at roughly 1,250 to 1,420 FYT per kg of feed, depending on the trait measured.
- What it means for you: If you raise pigs or work in animal nutrition, this research suggests that enzyme supplements may help reduce added mineral costs without hurting growth. This study does not show that people should change their own diets based on it. Pig farmers should check results on their own farms with a veterinarian or animal nutritionist.
The Research Details
The researchers wanted to know whether a special enzyme could replace some of the calcium and phosphorus that pigs normally get from added minerals. Phosphorus and calcium are essential for bone and body growth, and they are costly to add to feed. Phytase is an enzyme that helps animals release phosphorus stored in plant ingredients, such as corn and soybean meal, which pigs digest poorly on their own.
The 250 pigs were sorted into groups of similar size and starting weight, a method called a randomized complete block design. Each group was then randomly assigned to one of five diets. One diet was a positive control, a standard feed with adequate minerals. A negative control had less calcium and phosphorus with no enzyme. The other three diets had the same low-mineral base plus phytase at 600, 1,200, or 1,800 units (FYT) per kilogram of feed. Random assignment helps make sure differences between groups come from the diets rather than from the pigs themselves.
The pigs were tracked through three life stages: nursery, growing, and finishing. Researchers measured daily weight gain, how efficiently pigs turned feed into body weight, and, at the end, final weight and carcass measurements such as hot carcass weight, carcass yield, and lean meat percentage. Statistical models were then used to estimate the enzyme dose that produced the best result for each measure.
Comparing several enzyme doses against both a standard diet and a low-mineral diet with no enzyme makes the results easier to interpret. Because the pigs were assigned to groups at random, the researchers can be more confident that the enzyme itself, rather than other factors, caused the differences they observed. Following the pigs from early life to market weight also shows whether the effect lasts across the whole production cycle, not just for a short window.
The study used a randomized design, a recognized standard for controlled experiments, and tracked outcomes across the full production cycle. Its findings were reported with statistical measures, and the researchers used models to estimate optimal doses rather than relying only on the doses they happened to test. The journal, PLoS One, is peer-reviewed and widely read, although it is not among the most prestigious journals in the field.
Some details are unclear in the summary provided. The total number of pens or groups and the number of pigs per group are not clearly stated, and some statistical notes in the abstract appear to be missing or garbled. Readers who want the full picture should check the complete paper for these details before drawing firm conclusions.
What the Results Show
The clearest result was that pigs fed the low-mineral diet without enzyme did worse than pigs on the standard diet. During the nursery phase, these pigs gained weight more slowly and needed more feed for each unit of weight gained. This pattern continued into the growing and finishing phases, when they again gained less weight and converted feed less efficiently. In practical terms, these pigs needed more feed and took longer to reach market weight.
Adding phytase changed this picture. In both the nursery and the later growing and finishing phases, pigs that received the enzyme performed about as well as pigs on the standard diet. The researchers estimated that the best dose for feed efficiency was about 1,320 FYT per kilogram during the nursery phase and about 1,404 FYT per kilogram during the growing and finishing phases. These estimates suggest that the enzyme does not simply help a little; it appears to work best within a specific dose range.
The carcass results followed a similar pattern. Pigs on the low-mineral diet without enzyme had lower final body weight, lower hot carcass weight, lower carcass yield, and a lower percentage of lean meat than pigs on the standard diet. Enzyme supplementation brought these measures back to levels close to the standard diet. The estimated best doses for these traits ranged from about 1,246 to 1,416 FYT per kilogram, depending on the measure.
Final body weight, hot carcass weight, carcass yield, and lean meat percentage all showed a curved response to the enzyme dose. This means that more enzyme was not always better. Moderate doses appeared to give the strongest benefits, while the highest dose tested did not clearly add further improvement. For farmers, this matters because very high enzyme doses increase costs without guaranteed extra returns.
The lean meat finding may be especially relevant for producers, since lean meat percentage affects the value of a carcass. The fact that the enzyme restored this measure, not just weight gain, suggests that the benefit goes beyond simply helping pigs eat more. The results were statistically significant across these measures, meaning the differences between groups were unlikely to be due to chance alone.
Phytase has been widely used in pig and poultry feed for decades because it helps animals use phosphorus from plant ingredients more efficiently. This study fits within that body of work by showing that a high-dose version of the enzyme can offset a noticeable reduction in added minerals across a full pig production cycle. Its distinct contribution is the detailed look at several dose levels and the estimates of the best dose for each life stage. Readers should keep in mind that results can differ depending on the type of enzyme, the diet, the animal breed, and the farm setting.
This study was conducted only in pigs, so it cannot tell us how phytase or low-mineral diets affect people. The results come from one experiment, and more research in different farm settings would strengthen confidence in the findings. The abstract also leaves out some details, such as exact group sizes and certain statistical notes, which makes it harder to judge the study fully. Finally, the best-dose estimates are calculated from a statistical model and reflect the conditions of this study, so they may not match what every farm will see.
The Bottom Line
Moderate confidence: Research shows that adding phytase at roughly 1,250 to 1,420 FYT per kilogram helped pigs on low-calcium, low-phosphorus feed keep growth and carcass results close to those on a standard diet. This is a promising finding for pig producers. Farmers should confirm the dose and cost-effectiveness with their own nutritionist before making changes, since results may vary across farms and enzyme products.
Pig farmers, feed formulators, and animal nutrition professionals are the people most likely to benefit from this research. People who eat pork or are interested in food production may find the findings interesting, but the study does not give dietary advice for humans. Individuals managing their own calcium or phosphorus intake for health reasons should talk with a doctor or registered dietitian rather than relying on this research.
In this study, the effects appeared during the nursery phase and continued through the growing and finishing phases, so the benefit was visible over the whole production cycle. Farmers who adopt a similar approach should expect to evaluate results over several months, since the full benefit is measured at market weight. Results on a specific farm will depend on feed composition, management practices, and enzyme product.
Frequently Asked Questions
Can enzymes in pig feed replace some of the added phosphorus?
Research shows that adding phytase to low-phosphorus pig feed helped pigs keep growth and meat quality close to standard diets in a 2026 study of 250 pigs. The enzyme frees phosphorus already stored in plant ingredients, so less mineral must be added separately.
What is phytase and why do farmers add it to animal feed?
Phytase is a bacterial enzyme that breaks down phytate, a form of phosphorus stored in plant grains that pigs digest poorly. Adding it to feed helps animals absorb more of the minerals they eat, which can reduce the need for costly mineral supplements.
Does this research mean people should change their diet to use phytase?
This research was done only in pigs, so it does not show how phytase or low-mineral diets affect people. Anyone considering changes to calcium or phosphorus intake should consult a doctor or registered dietitian before making adjustments.
What dose of phytase worked best for pigs in the 2026 study?
The study tested 600, 1,200, and 1,800 FYT per kilogram of feed. Estimated best doses ranged from about 1,246 to 1,416 FYT per kilogram, depending on the trait measured, with feed efficiency peaking near 1,320 in the nursery phase.
Want to Apply This Research?
- For pig producers, track average daily weight gain and feed conversion ratio (pounds of feed needed per pound of weight gained) for each pen every week. Compare these numbers between enzyme-supplemented pens and standard-feed pens, and record final weight and carcass lean meat percentage at market.
- Users who raise pigs can use the app to log feed type, enzyme dose in FYT per kilogram, and weekly weights. Setting a reminder to review feed conversion every two weeks can help catch problems early, such as slower growth that may signal a dose or formulation issue. Users who are not raising pigs can use the app to learn about how feed affects animal growth, but should not apply these findings to their own diets.
- Over the long term, keep a record of each production batch, including feed formulation, enzyme dose, and performance results. Review trends across several batches to see whether the benefit holds up in your setting. Share summary results with a nutritionist or veterinarian each season so that dose and cost decisions are based on your farm’s own data.
This article summarizes an animal research study conducted in pigs. The findings do not establish dietary advice for humans and should not be used to change your diet, mineral intake, or health routine. Pig producers should consult a licensed veterinarian or animal nutritionist before changing feed formulations or enzyme doses. Anyone with questions about calcium or phosphorus intake should speak with a qualified healthcare provider.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.