According to Gram Research analysis, adding wheat middlings to a low-protein turkey diet does not increase disease transmission or severity compared to a standard low-protein diet. In a controlled study of young turkeys, both diet types resulted in identical disease spread rates and infection severity when birds were deliberately exposed to a parasitic infection. This finding suggests farmers can use wheat middlings as a cost-saving ingredient without worsening disease outcomes, though this applies only to intentionally protein-restricted diets.
Researchers studied how different low-protein diets affected young turkeys and their ability to spread a disease called blackhead. They compared two types of low-protein feed: one made from corn and soybeans, and another that also included wheat middlings (a grain byproduct). Both groups of turkeys got sick at similar rates, and neither diet made the disease spread faster between birds. The study shows that adding wheat middlings to a low-protein turkey diet doesn’t make disease transmission worse, which could help farmers choose more affordable feed options.
Key Statistics
A 2026 research article in Poultry Science found that turkeys fed a low-protein corn-soybean diet and turkeys fed a low-protein corn-soybean-wheat middlings diet showed identical rates of parasitic disease transmission when housed together.
In a controlled study of 160 young turkeys, both low-protein diet groups experienced similar intestinal permeability and comparable liver and intestinal damage from infection, indicating that wheat middlings inclusion did not worsen disease severity.
Research published in 2026 showed no significant differences in turkey mortality, growth rates, or disease infection rates between amino acid-deficient diets with and without wheat middlings over a 27-day period.
The Quick Take
- What they studied: Whether two different low-protein chicken feeds affected how easily a parasitic disease spreads between young turkeys living together
- Who participated: 160 young turkey chicks divided into two groups, each eating a different low-protein diet for 27 days
- Key finding: Both diets resulted in similar disease spread rates and severity. Adding wheat middlings (a cheaper grain ingredient) to the low-protein diet did not increase disease transmission compared to the basic low-protein diet.
- What it means for you: This research is primarily useful for turkey farmers deciding which affordable feed ingredients to use. The findings suggest wheat middlings can be safely added to low-protein diets without worsening disease spread, though this only applies when protein is intentionally restricted.
The Research Details
Researchers divided baby turkeys into two groups and fed them different diets for 27 days. Both diets were intentionally low in amino acids (protein building blocks) but otherwise similar in calories and minerals. One diet was made from corn and soybeans, while the other included wheat middlings, a byproduct from grain processing. To test disease spread, researchers deliberately infected some turkeys with a parasite called Histomonas meleagridis and placed them in cages with healthy turkeys to see how many would catch the disease.
The researchers measured several things: how much the turkeys grew, how many got sick or died, how easily bacteria could pass through their intestines, and how severe the disease became in infected birds. They also looked at liver and intestinal damage caused by the parasite. By comparing the two diet groups, they could determine whether the wheat middlings made any difference in disease transmission or severity.
This type of study is called a controlled experiment because researchers carefully controlled what the turkeys ate and deliberately exposed them to disease under identical conditions. This approach helps identify whether specific diet ingredients cause real differences in disease spread.
Understanding how diet affects disease spread in farm animals is important for keeping flocks healthy and reducing costs. If cheaper ingredients like wheat middlings don’t make disease worse, farmers can save money without sacrificing animal welfare. This research also helps scientists understand how nutrition affects the immune system and disease resistance in poultry.
This study was published in Poultry Science, a respected journal for farm animal research. The researchers used a controlled design with random assignment of turkeys to diet groups, which strengthens the reliability of findings. However, the study only looked at turkeys in small cages for a limited time period, so results may not apply to larger farm settings or longer production periods. The researchers also note that both diets were intentionally protein-deficient, so these findings only apply to that specific condition.
What the Results Show
The main finding was that both diet groups showed nearly identical results across all measured outcomes. Turkeys eating the corn-soybean diet and turkeys eating the corn-soybean-wheat middlings diet had the same growth rates, the same number of deaths, and the same rates of disease infection when exposed to the parasite. When researchers measured how easily bacteria could cross the intestinal barrier (a sign of gut health), both groups showed similar results.
When infected turkeys were placed with healthy turkeys to spread the disease naturally, the transmission rates were essentially the same between diet groups. The severity of disease, measured by damage to the liver and intestines, was also comparable. This consistency across all measurements suggests that wheat middlings, when added to a low-protein diet, do not change how the disease spreads or how sick the turkeys become.
Interestingly, the researchers found one small difference related to age: turkeys on the corn-soybean diet showed slightly different intestinal responses as they got older compared to turkeys on the wheat middlings diet. However, this difference did not translate into any practical difference in disease spread or severity.
The study measured intestinal permeability, which is how easily substances pass through the gut lining. Both diet groups had similar intestinal permeability, suggesting that the wheat middlings did not damage gut health or create an environment more favorable to disease. Mortality rates were comparable between groups, indicating that neither diet made turkeys more likely to die from the infection. The researchers also found that the liver and intestinal damage caused by the parasite was similar in both groups, showing that diet type did not influence how severely the disease affected infected birds.
Previous research has shown that nutrition affects how well animals can fight infections. This study adds to that knowledge by showing that when protein is restricted, the specific source of that restriction (wheat middlings versus standard ingredients) may not matter as much as the overall protein level. The findings align with other poultry research suggesting that ingredient choice is less important than meeting basic nutritional requirements, though this study specifically examined deficient diets rather than adequate ones.
The researchers note several important limitations. First, both diets were intentionally low in amino acids (protein), so these results only apply to protein-deficient situations. The findings may not apply to turkeys eating normal, adequate diets. Second, the study used small battery cages, which is not how most commercial turkeys are raised, so disease spread patterns might differ in larger, more realistic farm settings. Third, the study lasted only 27 days, which is a short period in a turkey’s life, so long-term effects are unknown. Finally, the researchers did not specify the exact number of turkeys in each cage, making it difficult to assess whether cage density affected results.
The Bottom Line
For turkey farmers considering feed ingredients: wheat middlings can be safely added to low-protein turkey diets without increasing disease transmission risk. This applies specifically when protein is intentionally restricted. Farmers should not interpret this as permission to feed low-protein diets overall, as adequate nutrition remains essential for turkey health. Confidence in this finding is moderate to high based on the controlled study design, though real-farm conditions may differ from laboratory cages.
This research is most relevant to commercial turkey producers and feed manufacturers looking for cost-effective ingredients. It may also interest poultry veterinarians and animal nutritionists. This research does not apply to backyard turkey owners or people raising turkeys in non-commercial settings, as the findings are specific to controlled farming conditions. Pet owners and consumers should not attempt to apply these findings to their own situations.
The disease transmission in this study occurred over 27 days, which is relatively quick. If farmers were to switch feed ingredients, they would likely see any effects on disease spread within a similar timeframe. However, long-term effects beyond 27 days are unknown.
Frequently Asked Questions
Does adding wheat middlings to turkey feed increase disease spread?
No. A 2026 study found that turkeys fed low-protein diets with wheat middlings had identical disease transmission rates compared to turkeys on low-protein diets without wheat middlings. Disease spread and severity were the same between both groups.
Is wheat middlings safe to use in poultry feed?
For low-protein diets, yes. Research shows wheat middlings do not harm turkey health or increase disease risk compared to standard low-protein ingredients. However, this study specifically examined protein-deficient diets, so results may not apply to adequately-fed birds.
Can I save money by using wheat middlings in turkey feed?
Potentially, yes. Since wheat middlings produced identical health and disease outcomes to standard ingredients in this study, farmers could explore cost savings. However, consult with a poultry nutritionist to ensure overall diet adequacy, as this study examined intentionally deficient diets.
How long does it take to see effects of feed ingredient changes on turkey health?
In this study, disease transmission occurred within 27 days. If switching feed ingredients, monitor flock health weekly for at least 3 to 4 weeks to identify any changes in disease rates or mortality patterns.
Does this research apply to my backyard turkeys?
This study used commercial farming conditions and intentionally low-protein diets, so results may not directly apply to backyard flocks eating adequate diets. Consult a poultry veterinarian for guidance specific to your situation.
Want to Apply This Research?
- For farm managers using a poultry health app: track daily mortality rates and visible signs of disease (lethargy, appetite loss) when switching between feed ingredients. Record the specific feed used each day and compare disease incidence rates week-by-week to identify any patterns.
- If managing a turkey flock, users could test switching to wheat middlings-based feed while monitoring disease rates using the app’s health tracking feature. Document feed costs saved and compare them against any changes in flock health metrics to make data-driven decisions about ingredient choices.
- Establish a baseline of current disease rates and mortality with existing feed, then track these metrics weekly after any feed change. Use the app to set alerts for unusual mortality spikes or disease signs, and maintain detailed records of feed batches and dates to identify correlations between specific ingredients and health outcomes.
This research applies specifically to young turkeys fed intentionally low-protein diets in controlled laboratory conditions. The findings do not apply to turkeys eating adequate diets or to other poultry species. This study was conducted in small battery cages and may not reflect disease transmission patterns in larger commercial or backyard settings. Before making changes to poultry feed or management practices, consult with a veterinarian or poultry nutritionist familiar with your specific operation. This article is for informational purposes and should not replace professional agricultural or veterinary advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.