Álvaro García
Lameness is one of the most visible and costly problems in dairy production, but what it causes often lies beneath the surface. Lame cows reduce feed intake, alter behavior, and experience broader physiological stress, highlighting that hoof problems are not isolated structural issues but part of a larger systemic challenge.
A recent study published in the Journal of Dairy Science (Hao et al. 2026) offers a deeper look at rumen-protected biotin (RPB) and its role in lactating dairy cows. The results point to something bigger than stronger hooves. They suggest that biotin may help cows manage metabolic stress, support liver function, and maintain cellular balance during lactation. In other words, this familiar nutrient may be working at the level of the whole cow.
From hoof supplement to whole-cow strategy
Hoof problems rarely develop in isolation. They are influenced by inflammation, nutrient supply, metabolic stress, and the cow’s ability to repair tissue. This aligns with broader observations that lameness is linked to behavioral changes, reduced intake, and systemic stress responses in dairy cows (García. 2025).
Biotin has traditionally been associated with keratin formation, the structural protein that gives hoof horn its strength. For years, supplementation has been used to improve hoof hardness and reduce the incidence of lesions. Previous research has consistently shown that biotin supplementation improves hoof health and reduces lesion incidence, although responses in milk production are less consistent (Lean and Rabiee 2011).
Beyond its structural role, biotin also plays a critical part in metabolic pathways related to energy and fatty acid metabolism, linking tissue integrity with broader physiological function in the cow (Singh et al. 2011).
Cows receiving RPB showed increased hoof hardness and lower lameness scores. However, the response did not stop at the outer horn. Biomarkers linked to cartilage breakdown declined, while markers associated with tissue formation increased. This indicates that biotin is influencing not only surface structure, but also much deeper tissue integrity. A nutritional strategy that improves these underlying processes can have a meaningful impact on long-term hoof health.
Interestingly, the most consistent responses in Hao’s study were observed at 1.0 g/day of RPB, rather than at the highest inclusion rate. This reinforces a practical principle in dairy nutrition: more is not always better. The goal is to achieve the right biological response, not simply the highest level of supplementation.
The liver–hoof connection
One of the most important findings in this study was the link between biotin supplementation and liver function. Cows fed RPB showed improvements in key liver-related markers. Indicators of liver stress, including alanine aminotransferase, aspartate aminotransferase, bilirubin, and cholesterol, they all declined, while albumin levels increased. These changes suggest a more stable and efficient liver during lactation. This is highly relevant to hoof health. The liver plays a significant role in energy metabolism, nutrient partitioning, and detoxification. When it is under stress, cows are more likely to experience systemic inflammation, oxidative damage, and impaired tissue repair, all factors that contribute to lameness. By supporting liver function, biotin may be addressing one of the root causes of hoof problems rather than simply improving their symptoms.
Managing oxidative stress
Another key outcome of the study was the effect of RPB on oxidative stress.
Biotin-supplemented cows showed higher total antioxidant capacity, along with increased levels of glutathione and superoxide dismutase, two major components of the body’s defense against oxidative damage. At the same time, levels of malondialdehyde, a marker of lipid peroxidation, were reduced.
These results indicate that the cows were better able to manage oxidative stress, a condition that is intricately linked to inflammation, immune challenges, and tissue damage.
In high-producing dairy cows, oxidative stress is not occasional, it is continuous. Nutritional strategies that strengthen antioxidant defenses can therefore improve resilience across multiple systems, including mobility, immunity, and overall performance.
Inside the cow: biology meets performance
What makes this research particularly valuable is that it goes beyond showing results, it explains why they happen.
By taking a closer look at how cows respond internally, the researchers found that biotin helps activate systems linked to antioxidant defense, hoof tissue formation, and energy metabolism. In simple terms, it is not just improving hoof quality, it is supporting the cow’s ability to manage stress, repair tissues, and use nutrients more efficiently.
At the same time, key compounds such as cysteine, glycine, and pyruvate were elevated. These play important roles in antioxidant production, tissue repair, and cellular energy supply. Together, these changes point to a coordinated response: the cow is not only building stronger tissue but also improving its ability to protect and maintain that tissue under stress.
In practical terms, biotin supports both structure and function, helping the cow build, maintain, and defend critical tissues like the hoof.
Importantly, these benefits were not reflected in a significant increase in milk yield. But that does not diminish their value. Not all nutritional improvements show up immediately in the bulk tank. Enhancing hoof health, liver function, and oxidative balance often delivers returns over time through reduced lameness, lower culling rates, and improved longevity.
At the same time, somatic cell counts declined, suggesting additional benefits for udder health.
From a management perspective, this positions rumen-protected biotin as a tool for improving resilience, not just output. In modern dairy systems, where cows operate under constant metabolic pressure, resilience is a key driver of sustained performance.
Take-home message
This study challenges the traditional view of biotin as a single-purpose hoof supplement. Instead, it presents biotin as part of a broader metabolic network influencing antioxidant defense, liver function, and tissue integrity. For dairy producers, the message is clear. Improving hoof health is not just about treating the hoof, it is about supporting the cow.
Rumen-protected biotin appears to contribute to that goal by strengthening the connections between metabolism, oxidative balance, and structural integrity. As production demands continue to increase, strategies that improve both health and resilience will become increasingly valuable.
Biotin may have entered dairy nutrition through the hoof, but it is proving to be much more than that. Hoof health cannot be separated from the cow’s metabolic condition. This research shows that rumen-protected biotin does more than improve hoof horn, it supports liver function, strengthens antioxidant defenses, and enhances the biological processes that maintain tissue integrity. These systemic effects help explain why improvements in lameness are not just structural, but physiological. For producers, the implication is clear: managing lameness effectively requires looking beyond the hoof and addressing the metabolic resilience of the cow. Nutritional strategies that support this foundation are likely to deliver more consistent and lasting results than those focused on the hoof alone.
The full list of references used in this article is available upon request.
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