According to Gram Research analysis, adding wheat bran, beet pulp, corn byproducts, or butyrate supplements to nursery pig diets did not improve growth, prevent diarrhea, or support intestinal health in a 2026 study of 610 pigs. Although these supplements altered gut bacteria composition, the changes did not translate to measurable health or performance benefits during the weaning period.
Researchers tested whether adding different types of fiber and a butyrate supplement to pig feed would help young pigs stay healthy and grow better after weaning. They studied 610 pigs across two trials, comparing a standard diet to diets with wheat bran, beet pulp, corn byproducts, or a butyrate additive. Surprisingly, none of these additions improved the pigs’ growth, prevented diarrhea, or changed their gut bacteria in beneficial ways. While the supplements did alter the types of bacteria in the pigs’ intestines, these changes didn’t translate to real health improvements. The findings suggest that these particular fiber sources and butyrate may not be necessary for supporting young pigs during the challenging weaning period.
Key Statistics
A 2026 research trial with 610 weaned pigs found that dietary fiber sources and tributyrin supplementation did not significantly improve average daily gain, feed intake, or gain-to-feed ratio compared to a standard control diet.
In a study of nursery pigs naturally infected with rotavirus and E. coli, wheat bran, beet pulp, corn distiller’s dried grains, and tributyrin did not reduce the proportion of pigs with soft or liquid fecal consistency across three weeks of measurement.
Although tributyrin tended to increase feed intake in phase 2 of a 610-pig trial, this increase did not result in greater final body weight compared to control pigs.
A 2026 analysis of 610 pigs found that dietary fiber treatments altered bacterial community composition, but these changes did not improve intestinal health markers or reduce pathogenic E. coli levels.
The Quick Take
- What they studied: Whether adding fiber from different plant sources or a butyrate supplement to pig feed would improve growth, prevent diarrhea, and support gut health in young pigs after weaning.
- Who participated: 610 weaned pigs divided into five groups across two separate trials. Each group received a different diet: a standard control diet, or one supplemented with wheat bran, beet pulp, corn byproducts, or butyrate. The pigs were naturally infected with common intestinal viruses and bacteria.
- Key finding: None of the fiber sources or butyrate supplements improved pig growth, reduced diarrhea, or changed gut health markers compared to the standard diet, despite altering the composition of gut bacteria.
- What it means for you: If you raise pigs, these particular supplements may not be worth the extra cost during weaning. However, other fiber sources or different doses might still help, so talk to a veterinarian or animal nutritionist before making feeding changes.
The Research Details
Researchers conducted a controlled feeding trial with 610 weaned pigs split into five groups. Each group ate a different diet for two phases lasting 14 and 28 days. One group ate a standard control diet, while the other four groups received the same base diet with one added ingredient: wheat bran (a grain fiber), beet pulp (a vegetable fiber), corn distiller’s dried grains (a byproduct fiber), or tributyrin (a butyrate supplement that supports gut bacteria). The pigs naturally had common intestinal infections, making this a realistic test of how these supplements work in real conditions.
Researchers measured several outcomes to determine if the supplements worked. They tracked how much the pigs ate and grew, checked their poop consistency to see if they had diarrhea, and collected samples to analyze their gut bacteria and intestinal health markers. They also measured short-chain fatty acids, which are compounds produced when gut bacteria break down fiber and are thought to support intestinal health.
The study was repeated twice to confirm results were consistent. This design allowed researchers to test whether different types of fiber (insoluble versus soluble) or butyrate would help pigs recover from the stress of weaning, when they transition from mother’s milk to solid food.
The weaning period is stressful for pigs and often causes reduced eating, slower growth, and diarrhea. If researchers could find an affordable supplement that prevents these problems, it would help farmers raise healthier pigs and reduce the need for antibiotics. This study tested promising candidates based on earlier research suggesting fiber and butyrate support gut health. However, the results suggest these particular supplements may not be the solution.
This study has several strengths: it included a large number of pigs (610), used realistic conditions with naturally infected animals, and repeated the experiment twice to confirm findings. The researchers measured multiple health markers rather than just one outcome. However, the study only tested these specific fiber sources and doses, so different types or amounts might work better. The pigs were all the same age and breed, so results may not apply to all pig populations. The study was published in a peer-reviewed journal, meaning other experts reviewed the methods and results.
What the Results Show
The most important finding was that none of the supplements improved pig growth or prevented diarrhea. In the first phase of feeding (14 days), all groups gained weight at similar rates and ate similar amounts. In the second phase (28 days), pigs given the butyrate supplement ate slightly more food than the control group and the beet pulp group, but this didn’t lead to more weight gain by the end of the study. Diarrhea rates were similar across all groups throughout the three-week study period.
When researchers analyzed the pigs’ intestines and fecal samples, they found that the supplements did change the types and amounts of bacteria living in the gut. The bacterial communities were noticeably different between treatment groups and changed over time. However, these bacterial changes did not improve intestinal health markers or reduce harmful bacteria like E. coli.
Short-chain fatty acids, which are produced when bacteria ferment fiber and are thought to support gut health, showed mixed results. On day 22, pigs on the standard diet had higher levels of certain fatty acids compared to some fiber groups, which was unexpected. On other measurement days (7, 10, and 42), there were no significant differences between groups. This inconsistency suggests the supplements did not reliably improve the production of these beneficial compounds.
The study found that corn distiller’s dried grains affected bacterial diversity differently than other treatments, with measurable changes between day 14 and day 42. This suggests this particular fiber source may have longer-lasting effects on gut bacteria composition, even though these changes didn’t improve health outcomes. The bacterial communities also naturally shifted over time as the pigs aged, which is normal and expected.
Earlier research suggested that fiber and butyrate could help young pigs by promoting beneficial bacteria and reducing diarrhea. This study’s results contradict those expectations, suggesting that either the specific fiber sources tested, the doses used, or the way they were delivered were not effective. It’s possible that other fiber types, higher doses, or different combinations might work better. The findings align with some recent research questioning whether all fiber supplements provide the same benefits.
This study only tested five specific diets, so results don’t tell us whether other fiber sources or different doses might work. The pigs were all similar in age and genetics, so results may not apply to all pig populations or farming conditions. The study measured bacterial changes but didn’t examine detailed intestinal tissue health under a microscope, which might have revealed subtle improvements. The pigs were naturally infected with viruses and bacteria, which is realistic but means some variation in results was expected. Finally, the study lasted only six weeks, so we don’t know if benefits might appear over longer periods.
The Bottom Line
Based on this research, adding wheat bran, beet pulp, corn distiller’s dried grains, or tributyrin to nursery pig diets does not appear necessary for supporting growth or preventing diarrhea during weaning. Farmers should focus on other proven strategies like proper feeding management, clean housing, and vaccination. If you’re considering these supplements, consult with a veterinarian or animal nutritionist, as other fiber sources or different doses might still provide benefits not tested in this study.
Pig farmers and veterinarians making feeding decisions for young pigs should pay attention to these results. Pet owners with pigs may find this less relevant unless they’re raising pigs for meat. Researchers studying gut health and fiber supplements should consider these negative results when designing future studies. Feed manufacturers may need to reconsider marketing these specific supplements for nursery pigs.
This study measured outcomes over six weeks, which covers the critical weaning period. If these supplements were going to help, improvements would likely have appeared within this timeframe. Longer-term benefits beyond six weeks are unknown.
Frequently Asked Questions
Does adding fiber to pig feed help prevent diarrhea after weaning?
In a 2026 study of 610 pigs, wheat bran, beet pulp, and corn byproducts did not reduce diarrhea rates compared to standard feed. While fiber supports gut bacteria, these specific sources didn’t provide measurable benefits during weaning.
Is butyrate supplement worth using for young pigs?
A 610-pig trial found that tributyrin (a butyrate source) slightly increased feed intake but did not improve growth or prevent diarrhea. The modest feed intake increase didn’t translate to better weight gain, suggesting the supplement may not justify its cost.
What actually helps pigs stay healthy during weaning?
This study didn’t test all possible interventions, but proven strategies include clean housing, proper temperature control, consistent feeding schedules, and vaccination. Consult a veterinarian for recommendations tailored to your specific herd and conditions.
Do different types of fiber work differently in pig diets?
This study tested insoluble fiber (wheat bran), soluble fiber (beet pulp), and fermented byproducts (corn DDGS), and none improved outcomes. However, other fiber sources or different doses might work differently, so individual testing may be worthwhile.
Can gut bacteria changes from fiber supplements improve pig health?
A 2026 trial found that fiber and butyrate altered gut bacteria composition, but these changes did not improve intestinal health, reduce harmful bacteria, or boost growth. Bacterial changes alone don’t guarantee health benefits.
Want to Apply This Research?
- If managing pig herds, track daily feed intake and weight gain weekly for each treatment group. Record fecal consistency daily using a simple scale (normal, soft, or liquid). Compare these metrics between your standard diet and any new supplements you test.
- Instead of adding expensive supplements, focus on optimizing basic management: ensure clean water and feeders, maintain proper temperature and ventilation, and follow a consistent feeding schedule. These proven strategies may be more effective than the supplements tested in this study.
- Establish a baseline of growth rates and diarrhea incidence in your current herd. If you try a new supplement, measure the same metrics over at least four weeks to see if real improvements occur. Track costs carefully to ensure any benefits justify the expense.
This research applies specifically to nursery pigs during the weaning transition and may not apply to other animal species, ages, or production stages. The study tested specific fiber sources and doses; other formulations may produce different results. These findings do not replace consultation with a veterinarian or animal nutritionist, who can assess your specific herd’s needs and conditions. Always follow label directions and consult professionals before making significant changes to animal feed or management practices.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.