Research shows that coating flaxseed oil in wax protects lambs’ digestion better than plain oil, but neither form actually improves the lambs’ growth or health compared to regular feed. A 2026 study of 50 lambs found that while wax-coated flaxseed oil prevented the digestive problems caused by plain oil, it didn’t provide enough benefit to justify using it as a regular feed supplement.
Researchers tested whether coating flaxseed oil in wax could help young lambs digest food better and stay healthier. They fed 50 lambs different amounts of regular flaxseed oil or wax-coated flaxseed oil for several weeks. According to Gram Research analysis, the wax coating helped protect the oil in the lamb’s stomach, preventing it from interfering with normal digestion. However, the study found that while the coating worked better than plain oil, it didn’t actually improve the lambs’ overall growth or health enough to recommend using it regularly. The findings suggest scientists need to test different amounts before this could become a useful farm practice.
Key Statistics
A 2026 randomized controlled trial of 50 young lambs found that plain flaxseed oil significantly reduced feed intake and digestibility, while wax-coated flaxseed oil mitigated these negative effects but did not improve overall performance compared to control feed.
Research reviewed by Gram showed that lambs receiving 4% to 8% wax-coated flaxseed oil maintained more normal eating behavior and nitrogen balance than lambs receiving plain oil, demonstrating the protective effect of the wax coating on rumen function.
In a 50-lamb study, wax-coated flaxseed oil prevented the digestive interference caused by unsaturated fats, but the coating did not enhance nutrient absorption or growth beyond baseline levels, indicating that protection alone is insufficient for practical farm benefits.
The Quick Take
- What they studied: Whether coating flaxseed oil in wax would help young lambs eat better, digest food more efficiently, and stay healthier compared to regular flaxseed oil or no oil at all
- Who participated: Fifty young male lambs, about five months old and weighing around 20 pounds each, divided equally into five groups of ten lambs each
- Key finding: Wax-coated flaxseed oil reduced negative effects on digestion compared to plain oil, but neither form improved the lambs’ overall performance or health significantly
- What it means for you: For farmers raising sheep, this research suggests that while coating oil in wax is a clever idea to protect digestion, the current amounts tested don’t provide enough benefit to justify the extra cost. More research is needed to find the right amount that would actually help.
The Research Details
Scientists divided 50 young lambs into five equal groups. One group ate normal feed with no added oil (the control group). Two groups received regular flaxseed oil mixed into their feed at two different amounts: 4% and 8%. Two more groups received the same amounts of flaxseed oil, but this oil was first coated in carnauba wax (a natural plant wax) to protect it. The wax coating was designed to prevent the oil from breaking down too early in the lamb’s stomach, which can interfere with normal digestion. All lambs ate the same base diet otherwise and were monitored for several weeks.
Researchers measured many things throughout the study: how much food each lamb ate, how long they spent eating and chewing, how well they digested their food, and changes in their blood chemistry. They also carefully tracked nitrogen balance, which shows whether the lambs’ bodies were using protein effectively. This comprehensive approach helped scientists understand not just whether the oil worked, but how it affected every part of the digestion process.
The study used a completely randomized design, meaning each lamb was randomly assigned to a group. This random assignment helps ensure that differences between groups came from the oil treatment, not from differences in the lambs themselves.
This research approach matters because flaxseed oil contains healthy fats that could potentially improve lamb health and growth, but these unsaturated fats can damage the delicate bacteria in a lamb’s stomach if they’re not protected. By testing whether a wax coating could solve this problem, scientists were investigating a practical solution that farmers could actually use. The study’s careful measurements of digestion and behavior help explain exactly what happens when oil enters the lamb’s digestive system, which is important for understanding whether similar approaches might work for other animals or nutrients.
This study has several strengths: it used a reasonable number of animals (50 total), divided them equally into groups, and measured many different outcomes rather than just one. The researchers tracked detailed information about eating behavior and digestion, which provides a complete picture. However, the study only lasted for one period, so we don’t know if the effects would continue over a longer time. The study was conducted on one specific type of lamb in one location, so results might differ with other sheep breeds or in different environments. The journal that published this research focuses on animal health in tropical regions, which is appropriate for this topic.
What the Results Show
When lambs received plain flaxseed oil (not coated in wax), they ate less food overall, and the amount they ate decreased even more as the oil amount increased. This happened because the oil interfered with normal stomach function. The wax-coated flaxseed oil performed better: lambs that received this version ate more food than those getting plain oil, showing that the wax coating successfully protected the oil from damaging the stomach.
However, the protection provided by the wax coating came with a trade-off. While the coated oil prevented the negative effects seen with plain oil, it also didn’t improve digestion or nutrient absorption compared to the control group that received no oil at all. The lambs’ bodies didn’t use the extra nutrients from the oil more efficiently, and their overall growth and health markers remained similar to the control group.
The study found that nitrogen balance (a measure of how well the body uses protein) was negatively affected by plain flaxseed oil but improved somewhat with the wax-coated version. This suggests the coating did provide some protection for the stomach’s ability to process nutrients. Blood chemistry measurements showed some changes in both oil groups, but these changes were not dramatic enough to indicate major health improvements.
Interestingly, the amount of oil mattered less than whether it was coated or not. Both the 4% and 8% amounts of coated oil produced similar results, suggesting that the coating’s protective effect worked at both levels tested.
The study measured how long lambs spent eating and chewing their food (called ingestive behavior). Lambs that received plain flaxseed oil showed changes in their eating patterns, spending different amounts of time on feeding activities compared to control lambs. This behavioral change suggests that the oil was affecting how the lambs’ stomachs felt and functioned. The wax-coated oil reduced these behavioral changes, indicating that the coating successfully minimized stomach irritation. Additionally, researchers measured how much of different parts of the feed the lambs selected and ate. Plain oil affected these selection patterns, but the coated oil had less impact, further supporting the idea that the wax coating protected normal digestive function.
Previous research has shown that unsaturated fats like those in flaxseed can provide health benefits for animals, but they can also damage the bacteria that live in the rumen (the first stomach chamber in sheep). This study confirms that concern and demonstrates that coating the oil in wax is a reasonable strategy to prevent damage. However, the finding that wax-coated oil didn’t actually improve performance beyond the control group suggests that simply protecting the oil isn’t enough. Other research has found that the amount and type of fat, as well as how it’s combined with other nutrients, all matter for effectiveness. This study adds to that body of knowledge by showing that protection alone doesn’t guarantee benefit.
This study has several important limitations. First, it only tested two amounts of oil (4% and 8%), so we don’t know if higher or lower amounts might work better. Second, the study lasted only one period, so we can’t tell if effects would change over weeks or months. Third, the study used only one type of lamb (Santa Inês crosses), so results might differ with other sheep breeds. Fourth, the study was conducted in one location under specific conditions, so results might not apply to different climates or farming systems. Finally, the researchers didn’t test different types of wax coatings or different coating percentages, so we don’t know if other protective methods might work better. The study also didn’t measure long-term health outcomes like disease resistance or reproduction, which would be important for farmers to know.
The Bottom Line
Based on this research, farmers should not routinely add flaxseed oil (coated or uncoated) to lamb feed at the amounts tested, as it doesn’t improve growth or health outcomes. If farmers want to try flaxseed oil, the wax-coated version is clearly better than plain oil because it prevents digestive problems, but the benefit is mainly in avoiding harm rather than gaining advantage. Before using this product, farmers should wait for additional research testing different amounts and longer time periods. Confidence in this recommendation is moderate, as the study was well-designed but limited to one lamb type and one time period.
Sheep and lamb farmers should pay attention to this research, especially those considering adding flaxseed oil to improve animal health. Veterinarians and animal nutritionists who advise farmers should also note these findings. This research is less relevant to people who don’t raise livestock, though it contributes to general knowledge about animal nutrition. Consumers of lamb meat might be interested in understanding what farmers feed their animals, but this particular study doesn’t affect food safety or quality.
If a farmer decided to add wax-coated flaxseed oil to lamb feed, they would likely see changes in eating behavior within days to weeks. However, based on this study, they should not expect to see improvements in growth or health within a typical 8 to 12-week feeding period. Any benefits would probably take several months to become apparent, if they appear at all. The study suggests that the current approach may not provide meaningful benefits even over longer periods.
Frequently Asked Questions
Does flaxseed oil help lambs grow faster and healthier?
According to a 2026 study of 50 lambs, neither plain nor wax-coated flaxseed oil improved growth or health compared to regular feed. While the wax coating prevented digestive problems from plain oil, it didn’t provide enough benefit to recommend using it routinely.
What is rumen-protected flaxseed oil and how does it work?
Rumen-protected flaxseed oil is flaxseed oil coated in carnauba wax to prevent it from damaging the bacteria in a lamb’s first stomach chamber. The wax coating protects the oil until it reaches later parts of the digestive system where it’s safer.
Can I add flaxseed oil to my sheep’s feed to improve their health?
Research suggests you should not expect health improvements from adding flaxseed oil to sheep feed at typical amounts. While wax-coated oil is safer than plain oil, the study found it didn’t enhance growth, digestion, or overall performance compared to regular feed.
How much flaxseed oil should I give lambs if I decide to use it?
The study tested 4% and 8% amounts of wax-coated flaxseed oil, with similar results at both levels. However, since neither amount improved performance, the research doesn’t support a specific recommendation for farm use.
Is wax-coated flaxseed oil better than plain flaxseed oil for lambs?
Yes, wax-coated flaxseed oil is clearly better than plain oil because it prevents digestive problems and maintains normal eating behavior. However, the coating only prevents harm rather than providing actual health benefits compared to not using oil at all.
Want to Apply This Research?
- If tracking lamb nutrition, record daily feed intake (in pounds or kilograms), weekly weight gain, and any changes in eating behavior or digestion. Compare these measurements between lambs receiving different feed types to identify which approach produces the best results for your specific animals.
- Farmers using a livestock management app could set up alerts to monitor feed intake daily and weight weekly. If using flaxseed oil, they should document the exact amount, whether it’s coated, and any observed changes in the lambs’ eating patterns or health. This data helps determine whether the oil is actually beneficial for their specific animals and conditions.
- Over a 12-week period, track feed intake, body weight, and feed efficiency (weight gained per pound of feed eaten). Create a simple spreadsheet comparing these metrics between control lambs and those receiving flaxseed oil. This long-term tracking reveals whether the oil provides any practical advantage, which the current research suggests is unlikely but worth monitoring on your farm.
This research applies specifically to young lambs under controlled study conditions and may not reflect results in different sheep breeds, ages, or farming environments. Farmers should consult with a veterinarian or animal nutritionist before making changes to livestock feed. This study does not provide medical advice for human consumption of flaxseed products. Results are from a single research trial and should not be considered definitive guidance for farm management decisions.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.