Feeding baby calves 15% corn gluten feed—a byproduct from corn processing—significantly boosts their growth, feed intake, and bone development compared to regular feed, according to a 2026 study of 44 Holstein calves. Gram Research analysis shows this moderate inclusion level produces the best results, with calves gaining weight faster and developing stronger bones, while higher amounts provide diminishing returns.
Researchers tested whether feeding baby calves a corn byproduct called corn gluten feed instead of regular grain would help them grow better. They studied 44 newborn calves and gave different groups varying amounts of this byproduct mixed into their feed. The results showed that calves receiving a moderate amount—about 15% of their daily feed—grew faster, ate more, and developed stronger bones than calves on regular feed. This discovery could help farmers raise healthier calves more efficiently while using less expensive ingredients.
Key Statistics
A 2026 study of 44 Holstein calves found that those fed 15% corn gluten feed showed the highest growth rates and feed intake compared to calves on regular feed or higher inclusion levels of the byproduct.
Research published in Tropical Animal Health and Production demonstrated that corn gluten feed inclusion at 15% of dry matter produced quadratic improvements in body weight and average daily gain, with peak benefits at this moderate level.
According to a controlled feeding trial with 44 calves divided into four groups, skeletal measurements including withers height, hip height, and heart girth were significantly greatest in calves receiving 15-30% corn gluten feed substitution.
A 2026 analysis of calf nutrition found that feed efficiency peaked at 15% corn gluten feed inclusion, with diminishing returns observed at 30% and 45% levels, indicating an optimal economic and biological threshold.
The Quick Take
- What they studied: Whether replacing regular grain with corn gluten feed (a leftover from corn processing) helps baby calves grow faster and stronger
- Who participated: 44 newborn Holstein calves (a dairy breed) that were 3 days old and weighed about 40 kilograms each, divided into 4 equal groups
- Key finding: Calves fed 15% corn gluten feed grew the fastest, ate the most food, and had the strongest bone development compared to calves on regular feed or higher amounts of the byproduct
- What it means for you: Farmers could use this cheaper corn byproduct to raise healthier calves more efficiently, though the benefit peaks at moderate levels—too much doesn’t help as much
The Research Details
Scientists divided 44 newborn calves into four equal groups of 11 calves each. Each group received a different diet: one group got regular feed with no corn gluten feed, while the other three groups received increasing amounts of corn gluten feed mixed into their regular feed (15%, 30%, and 45% of their daily food). The researchers carefully measured how much each calf ate, how much weight they gained, and how their bones developed over several weeks. They also watched how the calves behaved while eating and chewing their food.
This type of study is called a ‘completely randomized design,’ which means each calf was randomly assigned to a group to make sure the results weren’t biased. The researchers tracked the calves from birth through weaning (when they stopped drinking milk), measuring their growth and health markers at regular intervals.
The study was designed to find the ‘sweet spot’—the exact amount of corn gluten feed that works best without wasting money or reducing the quality of the calves’ nutrition.
This research approach is important because it tests a practical, real-world solution that farmers could actually use. By testing four different amounts instead of just one, the researchers could find the optimal level rather than just proving the ingredient works. This helps farmers make smart decisions about feed costs and calf health.
The study was well-designed with a reasonable sample size (44 calves) and careful measurement of multiple health markers. The researchers used statistical analysis to determine whether differences between groups were real or just due to chance. However, the study was conducted in a controlled farm setting, so results might vary slightly in different environments or with different breeds of calves.
What the Results Show
Calves fed 15% corn gluten feed showed the best results across almost every measure. These calves ate more food overall, gained weight faster, and had stronger bone development in their shoulders, hips, and chest compared to calves on regular feed. The improvement was most noticeable during the middle growth phase.
When researchers looked at the numbers mathematically, they found that growth and bone development followed a curved pattern—meaning benefits increased up to 15% corn gluten feed, then started to decrease at higher levels. This is why 15% emerged as the ‘sweet spot.’ Calves fed 30% corn gluten feed also showed good results, but not quite as good as the 15% group. Calves fed the highest amount (45%) showed diminishing returns, meaning the extra corn gluten feed didn’t provide extra benefits.
Interestingly, how much the calves ate increased steadily as more corn gluten feed was added to their diet, but the efficiency of converting that food into body weight peaked at 15%. This means the 15% group got the most growth benefit from each bite of food they ate.
The researchers also measured how calves behaved—how much time they spent eating, chewing their food (ruminating), and doing non-nutritive oral activities like licking or chewing without eating. These behaviors did not differ significantly between groups, suggesting that the corn gluten feed didn’t change how the calves naturally behaved. Some body measurements like body length and hip width also didn’t change between groups, indicating that the corn gluten feed specifically boosted growth in certain areas rather than overall size.
This research builds on earlier studies showing that byproducts from food processing can be valuable in animal feed. According to Gram Research analysis, this study is notable because it identifies a specific optimal level (15%) rather than just confirming that the ingredient works. Previous research suggested byproducts could work, but this study provides farmers with precise guidance on how much to use for maximum benefit.
The study was conducted with only one breed of calves (Holstein) in a controlled farm setting, so results might differ with other breeds or in different environments. The sample size of 11 calves per group is moderate—larger studies might reveal additional details. The study also didn’t track the calves long-term after weaning, so we don’t know if the early growth benefits persist as the calves mature into adult cows. Additionally, the cost savings of using corn gluten feed weren’t calculated, though the ingredient is typically cheaper than regular grain.
The Bottom Line
Farmers raising dairy calves should consider replacing up to 15% of regular grain feed with corn gluten feed to optimize growth and bone development. This level appears safe and effective based on this research. Higher amounts (30-45%) provide diminishing returns and aren’t recommended. Farmers should monitor individual calf growth to ensure the change works well in their specific situation. Confidence level: Moderate to High for dairy calves in similar conditions.
Dairy farmers raising calves will find this most relevant, as it directly affects their feed costs and calf health. Veterinarians advising farmers on nutrition should know about this finding. Farmers raising other types of cattle might see similar benefits, though this study specifically tested dairy calves. This is less relevant for people raising beef cattle or other animals.
Benefits should appear within 2-4 weeks of switching to the new feed, with the most noticeable improvements in growth rate and appetite during the first month. Bone development improvements may take 4-8 weeks to become fully apparent. The benefits continue through the weaning period (typically 6-8 weeks of age).
Frequently Asked Questions
What is corn gluten feed and why would farmers use it for calves?
Corn gluten feed is a byproduct left over after corn is processed for human food. Farmers use it because it’s cheaper than regular grain while still providing good nutrition. Research shows it can actually improve calf growth when used at the right levels.
How much corn gluten feed should I give my baby calves?
Research shows 15% of the calf’s daily feed should be corn gluten feed for best results. This means if a calf eats 1 kilogram of feed daily, about 150 grams should be corn gluten feed. More than this doesn’t provide extra benefits.
Will switching to corn gluten feed make my calves grow faster?
Yes, according to a 2026 study of 44 calves, those fed 15% corn gluten feed gained weight faster and ate more food than calves on regular feed. Benefits appeared within 2-4 weeks of starting the new feed.
Does corn gluten feed affect how calves behave or digest food?
Research found no significant differences in eating behavior, chewing patterns, or digestive issues between calves fed corn gluten feed and those on regular feed, suggesting it’s a safe substitute when used at appropriate levels.
Is this corn gluten feed safe for all types of calves?
This study tested dairy calves specifically. While the results are promising, farmers with other cattle breeds should monitor their animals closely when making feed changes, as results may vary based on breed and farm conditions.
Want to Apply This Research?
- Track weekly calf weight gain and daily feed intake in grams. Compare actual growth rates to expected benchmarks for the breed to see if the 15% corn gluten feed inclusion is delivering expected benefits.
- Switch feed gradually over 7-10 days, mixing increasing amounts of corn gluten feed into regular feed. Start at 5%, increase to 10%, then reach the target 15% to allow calves’ digestive systems to adjust smoothly.
- Measure calf body weight weekly and record feed consumption daily. Track skeletal measurements (height at shoulder, hip height, chest girth) every 2 weeks. Monitor for any digestive issues or behavior changes. Compare results to breed-specific growth standards to confirm the feeding strategy is working.
This research provides evidence-based information about calf nutrition but should not replace professional veterinary or nutritional advice. Before making significant changes to your calf feeding program, consult with a veterinarian or animal nutritionist familiar with your specific herd, farm conditions, and local feed availability. Individual calf responses may vary based on genetics, environment, and overall farm management practices. This study was conducted with Holstein dairy calves and results may not apply equally to other breeds or types of cattle.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.