New study links SINS lesions to systemic biomarkers in pigs
Bottom line
Swine inflammation and necrosis syndrome, or SINS, may be more clearly tied to whole-body inflammatory and metabolic changes than to visible lesions alone, according to a new exploratory paper published August 31, 2026, in Animals. In 45 undocked piglets followed through suckling and weaner stages on two farm cooperatives within one commercial production system, researchers found associations between SINS lesion patterns and blood-based inflammatory, hematologic, and metabolic markers. Using LASSO regression, pig major acute phase protein (PigMAP) emerged as the biomarker most strongly associated with SINS-related traits, with positive links to tail base bristle loss and teat redness, while some traits, including heel swelling and tail tip reddening, showed negative or no association. (mdpi.com)
Why it matters: For veterinary professionals, the study adds to a growing body of evidence that SINS isn't just a surface lesion problem, but part of a broader systemic process involving inflammation, coagulation, liver metabolism, and possibly gut-derived triggers. Earlier work and reviews have described SINS as a multifocal syndrome that can affect tails, ears, claws, and teats, with prior studies linking higher SINS scores to altered blood counts, acute phase proteins, serum metabolites, and inflammatory liver pathways. That makes biomarker-based monitoring a potentially useful complement to clinical scoring, even if this latest study is small and exploratory. (mdpi.com)
What to watch: Whether follow-up studies validate PigMAP and related markers in larger herds, and whether they translate into practical screening tools or prevention strategies tied to sow health, nutrition, housing, and gut integrity. (mdpi.com)
Key facts
- Study type
- Exploratory paper
- Journal
- Animals
- Publication date
- August 31, 2026
- Sample size
- 45 undocked piglets
- Study setting
- Two farm cooperatives within one commercial production system
- Main finding
- SINS lesion patterns were associated with inflammatory, hematologic, and metabolic blood markers
- Top biomarker
- PigMAP
- Positive associations
- Tail base bristle loss, and teat redness
- Negative or no association
- Heel swelling, and tail tip reddening
A newly published Animals study pushes the SINS conversation beyond visible lesions and toward systemic biology. Published August 31, 2026, the paper examined 45 undocked piglets from two farm cooperatives and found that clinical expression of swine inflammation and necrosis syndrome was associated with inflammatory, hematologic, and metabolic blood markers, with PigMAP standing out as the strongest biomarker signal in the authors' model. (mdpi.com)
That finding fits with how the syndrome has been evolving in the literature. SINS has increasingly been described as a multifocal inflammatory condition affecting tails, ears, claws, teats, and other body regions, rather than a problem explained only by trauma or tail biting. A 2021 review argued that the syndrome appears to be primarily endogenous, though modified by environmental and mechanical factors, citing its appearance across multiple body sites, evidence of expression before birth, and vascular inflammatory changes in newborn piglets. (mdpi.com)
In the new study, the investigators assessed piglets during both suckling and weaner stages, quantified lesions across multiple body regions, and analyzed clinical chemistry and hematology in weaners. According to the paper summary indexed online, PigMAP showed positive associations with tail base bristle loss and teat redness, while heel swelling and tail tip reddening were negatively associated or not associated. The authors frame the work as exploratory, aimed at better characterizing the systemic inflammatory processes linked to SINS expression. (mdpi.com)
The broader evidence base supports that direction. A prior study reported significant differences in red and white blood cell counts, blood coagulation parameters, serum metabolites, and acute phase proteins across pigs with different SINS scores, supporting the syndrome's inflammatory-necrotizing character. More recent longitudinal work has also described SINS as a practical animal-based health and welfare indicator, with average herd-level involvement that can be substantial and with evidence of altered coagulation and liver-associated chemistry in affected animals. (pubmed.ncbi.nlm.nih.gov)
Industry and academic commentary around SINS has also increasingly centered on gut integrity, systemic inflammation, and management risk factors. Reviews and related nutrition-focused literature have linked SINS hypotheses to translocation of bacterial products such as lipopolysaccharide, inflammatory liver responses, and housing or feeding conditions that may contribute to a "leaky gut" picture. Some authors have gone further, proposing that these same pathways may connect SINS with tail biting and other welfare problems in undocked pigs. (pmc.ncbi.nlm.nih.gov)
Why it matters: For swine veterinarians and production advisors, this paper strengthens the case for treating SINS as a herd health and systemic disease signal, not just a lesion scoring exercise. If biomarkers such as PigMAP continue to perform in future studies, they could help refine case definition, improve monitoring, and support earlier intervention in herds where clinical signs are subtle or mixed. At the same time, the study's small sample size and exploratory design mean it's better read as a biologic clue than a practice-ready diagnostic breakthrough. (mdpi.com)
The work also matters because it points veterinary attention upstream. If SINS reflects interactions among inflammation, metabolism, coagulation, sow condition, nutrition, and environment, then prevention may depend less on treating lesions and more on reviewing feed formulation, gut health, farrowing and nursery conditions, hygiene, and genetic or line-level susceptibility. Prior literature has suggested that optimizing sow status and husbandry can reduce the problem, and newer research has explored sire-associated patterns as well. (jlupub.ub.uni-giessen.de)
What to watch: The next step is validation: larger field studies, clearer biomarker thresholds, and work showing whether blood markers can meaningfully guide herd-level decisions alongside clinical scoring. Just as important will be whether future studies can sort out which signals are most actionable for veterinarians in commercial systems, and how much of SINS risk is driven by management versus underlying biology. (mdpi.com)