Researchers tested whether a natural plant extract called Astragalus could help young pigs stay healthy after being weaned from their mothers. They gave some piglets a regular diet, some received antibiotics (the standard treatment), and others got the plant extract. After four weeks, the piglets that received either the plant extract or antibiotics grew better, got sick less often, and had stronger immune systems. The plant extract worked almost as well as antibiotics by reducing harmful stress in the piglets’ bodies and improving the helpful bacteria in their stomachs.
The Quick Take
- What they studied: Whether a natural plant extract from Astragalus could help young pigs grow better and stay healthier during the stressful time when they stop drinking their mother’s milk
- Who participated: 60 young piglets that were 28 days old and weighed about 18 pounds each, divided into three groups of 20 piglets each
- Key finding: Piglets that received the plant extract grew faster, had fewer stomach problems, and showed stronger immune systems compared to piglets that got no special treatment—performing almost as well as piglets given antibiotics
- What it means for you: This research suggests that natural plant extracts might be a helpful alternative to antibiotics for supporting animal health during stressful times, though more research in other animals and situations is needed before drawing firm conclusions
The Research Details
Scientists divided 60 young piglets into three equal groups. One group ate a normal diet (control group), one group’s food contained antibiotics (the standard medical treatment), and one group’s food contained the Astragalus plant extract. All piglets ate their assigned diet for exactly 28 days while the researchers carefully tracked how much they ate, how much they grew, and their overall health. The scientists collected blood samples and tissue samples from the piglets’ intestines and livers to measure their immune strength and how well their bodies were handling stress.
This type of study is called a controlled experiment because it compares different groups receiving different treatments while keeping everything else the same. This design helps researchers figure out whether the plant extract itself caused the improvements, rather than other factors.
The study was well-designed because it included a group receiving the standard antibiotic treatment, which allowed the researchers to compare the plant extract’s effectiveness directly against what doctors normally use.
This research matters because antibiotics are becoming less effective as bacteria develop resistance to them, and scientists need to find natural alternatives that work well. By testing the plant extract in a controlled way with young animals during a naturally stressful time (weaning), researchers can understand whether natural treatments might replace antibiotics in the future. The study also measured multiple health markers—growth, immunity, digestion, and gut bacteria—giving a complete picture of how the treatment works.
This study has several strengths: it included a proper control group, used an antibiotic comparison group, measured multiple health markers, and collected tissue samples for detailed analysis. However, the study only tested one plant extract dose and only lasted four weeks, so longer-term effects remain unknown. The research was conducted only in pigs, so results may not apply to other animals or humans. The study appears to be well-conducted based on its methodology, though the journal’s overall reputation cannot be assessed from the information provided.
What the Results Show
Piglets receiving the plant extract grew significantly faster and gained more weight compared to piglets eating the regular diet. Over the four-week study period, the plant extract group performed nearly as well as the antibiotic group, suggesting the natural treatment was quite effective.
One of the most important findings was that diarrhea (loose stools) decreased dramatically in the first two weeks for piglets receiving either the plant extract or antibiotics. This is significant because diarrhea is a major problem when young animals are weaned, and reducing it helps them stay healthier and grow better.
When scientists examined the piglets’ blood and tissue samples, they found that those receiving the plant extract had stronger immune systems. Specifically, their bodies produced more protective proteins called immunoglobulins, which help fight off infections. Additionally, the plant extract reduced oxidative stress—a type of cellular damage that happens when the body is under stress—by boosting the activity of protective enzymes in the liver and intestines.
The plant extract also strengthened the barrier in the piglets’ intestines that prevents harmful substances from entering the bloodstream. This is like reinforcing a wall that protects the body from invaders.
The researchers discovered that the plant extract changed the types of bacteria living in the piglets’ stomachs and intestines in beneficial ways. Specifically, it increased helpful bacteria called Blautia, Turicibacter, Agathobacter, and Clostridium. These bacteria help with digestion and support overall health. The plant extract also appeared to improve how well piglets digested protein from their food, though this improvement was less dramatic than the other benefits.
This research builds on decades of traditional medicine use of Astragalus in Asia and recent scientific studies showing that this plant has protective properties. Previous research suggested Astragalus might help with immunity and reduce stress, and this study confirms those ideas while providing specific measurements. The finding that the plant extract performed almost as well as antibiotics is particularly noteworthy because most natural treatments haven’t shown this level of effectiveness in controlled studies.
This study tested only young pigs during one specific stressful period (weaning), so results may not apply to other animals, older pigs, or different situations. The researchers only tested one dose of the plant extract, so they don’t know if higher or lower doses might work better. The study lasted only four weeks, so long-term effects remain unknown. Additionally, while the plant extract worked well in this controlled setting, real-world results might differ because farm conditions vary. Finally, the study was conducted in pigs, not humans, so we cannot assume these benefits would occur in people without additional research.
The Bottom Line
Based on this research, there is moderate evidence that Astragalus extract may help young animals stay healthier during stressful transitions by supporting their immune systems and digestive health. However, this evidence comes from a single study in pigs, so more research is needed before making strong recommendations. If you’re involved in animal agriculture, this research suggests Astragalus extract is worth investigating as a potential natural alternative to antibiotics, but consult with a veterinarian before making changes to animal diets.
This research is most relevant to farmers, veterinarians, and animal nutritionists looking for natural ways to support young animal health without relying on antibiotics. Pet owners might find this interesting for understanding natural health support, though the research doesn’t directly apply to pets. People interested in natural medicine and plant-based health solutions may also find this research encouraging, though it’s important to remember this was tested in animals, not humans.
In this study, the benefits appeared within the first two weeks (reduced diarrhea) and continued improving over the full four-week period. If similar effects occurred in other animals or situations, you might expect to see initial improvements within 1-2 weeks and more substantial benefits after 3-4 weeks of consistent use.
Want to Apply This Research?
- If tracking animal health, record daily observations of digestion quality (stool consistency), appetite level, and visible energy/activity levels. For humans interested in gut health, track weekly digestive comfort, energy levels, and any changes in digestion patterns if using similar supplements.
- For farmers or animal caretakers: Consider introducing Astragalus extract during naturally stressful periods (like weaning) and track the results compared to previous years. For individuals: If interested in similar plant-based immune support, consult a healthcare provider about appropriate supplements and track your immune health markers (like frequency of getting sick) over several months.
- Establish a baseline of normal health markers before starting any new supplement, then monitor weekly for the first month to see if improvements appear. Continue tracking monthly thereafter to ensure benefits persist. Keep detailed records comparing results to previous periods without the supplement to accurately assess effectiveness.
This research was conducted in young pigs and does not directly apply to humans or other animals without additional research. While the findings are promising, they represent a single study with a small sample size. Anyone considering using Astragalus or similar supplements should consult with a qualified healthcare provider or veterinarian before making changes to diet or treatment plans. This information is for educational purposes only and should not replace professional medical or veterinary advice. The long-term safety and effectiveness of Astragalus extract in other species or situations has not been established.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.