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An ex vivo comparison of jejunal transection angles and the effect on lumen diameter following end-to-end jejunojejunal anastomoses. To evaluate three different jejunal transection angles for end-to-end jejunojejunostomies, comparing construction time, lumen size, and suture number. Methods: Ex vivo cadaver study. Methods: Eight euthanized horses each had three mid-jejunal specimens harvested. Methods: Jejunal segments were assigned to one of three groups (A30, A45, and A60) and transected at 30, 45, or 60°, respectively. Following transection, a standardized handsewn single-layer interrupted modified Lembert anastomosis was performed, and construction time and number of sutures placed were recorded. Anastomotic index (AI)...
Long-Term Humoral Immune Response After West Nile Virus Convalescence in Horses in a Geographic Area of Multiple Orthoflavivirus Co-Circulation. In the last three decades, West Nile virus (WNV, Flaviviridae, Orthoflavivirus genus) has become one of the most important encephalitic agents worldwide, causing substantial numbers of cases in humans and horses every year by re-emerging in endemic areas and emerging in new territories. It is considered that after natural WNV infection, humans and birds develop long-term immunoprotection, but data on immunoprotection in horses is scarce. Objective: West Nile virus infection provides long-term humoral immunity in subclinically infected horses. Methods: Client-owned, naturally WNV subclinically ...
Modelling Energy Demands of Cross-Country Tests in 2-Star to 5-Star Eventing Competitions. Eventing is an Olympic equestrian discipline comprising dressage, cross-country, and show jumping, with the cross-country phase imposing the greatest physical demands on horses. This study presents a composite model to estimate energy expenditure during the cross-country phase, integrating physiological data (heart rate-derived VO2 and lactate-based anaerobic estimates) with external workload indicators (GPS-derived speed, elevation, and course complexity). Model development was based on 691 rides from 256 horses across 232 events at 2-star to 5-star competition levels. The analysis showed tha...
Task-specific morphological and kinematic differences in Lipizzan horses. Equine locomotion emerges from a dynamic interplay between morphology, biomechanics, and functional demands. This study examines the relationship between morphological measurements and gait kinematics in Lipizzan horses, a breed renowned for its diverse work tasks and standardized environmental conditions. These horses offer a unique opportunity to explore task-specific adaptations in biomechanics, with significant implications for breeding strategies and welfare practices. Unassigned: The study involved 71 healthy Lipizzan horses that were housed at the Lipica stud farm and performed various ...
Influences of Double Versus Snaffle Bridles on Equine Behaviour at Dressage Competitions and Factors That Interact with Their Effect. Despite welfare concerns, conflict behaviours (indicative of momentary states of acute stress) are common in horses during dressage competitions. Identifying factors that affect conflict behaviours during competition therefore has the potential to improve equine welfare. The aim of this exploratory study was to assess the effect of bridle type (double versus snaffle) in relation to other potential affecting factors (e.g., average head angle, competition level and type, tack variation) on conflict behaviours during dressage competition. An ethogram was created to analyse the conflict behaviour ...
Haplotype structure and heterozygosity around the fragile foal syndrome variant in Swedish Warmblod horses. Fragile foal syndrome (FFS) is a disease caused by a recessive lethal missense mutation in the PLOD1 gene located on ECA2. Despite its harmful effect, a relatively high frequency of FFS carriers was observed in Warmblood breeds spanning from 7.4% in a random sample of Swedish Warmblood breed to 17% in the Hanoverian and Danish Warmblood, indicating potential heterozygous advantage. Balancing selection can be further studied based on haplotype blocks and via detection of heterozygosity-rich region (ROHet) around the target of selection. In this study we evaluated the presence of haplotype block...
Correction: Expression of genes with biomarker potential identified in skin from DSLD-affected horses increases with age. [This corrects the article DOI: 10.1371/journal.pone.0287740.].
The Confidential Enquiry into Perioperative Equine Fatalities: phase 4 (CEPEF4) – a worldwide observational, prospective, multicentre cohort study in 2025. To report on the Confidential Enquiry into Perioperative Equine Fatalities 4 (CEPEF4). Methods: Confidential, observational, prospective, multicentre, cohort study. Methods: 47,396 horses/ponies undergoing general anaesthesia (GA). Methods: Characteristics of each GA (249 variables) were collected. Outcomes after seven days were ALIVE (or discharged), EUTHANASIA or DEAD. Logistic regression analysed patient demographics and the anaesthetic drugs (p < 0.05). Results: Data were collected from 47,396 GAs in 93 centres in 28 countries. Death rates were 1.2% overall, 0.6% for cases classified as...
Group housing increases alertness and social interaction compared to traditional single stabling in two-year-old sport horse stallions during pretraining. Horses in training are often stabled individually, but this is increasingly questioned. We have investigated the effects of different stabling systems in Warmblood stallions during a 12-week pretraining programme. Stallions were 24 months old and housed either in a group stable (Group 24, n = 9) or in individual boxes (Box 24, n = 10), or they were 30 months of age and housed in individual boxes (Box 30, n = 10). Cortisol, heart rate, heart rate variability (HRV), body development, injuries and selected behaviour patterns were analysed (1) at transfer from pasture to stable and (2) the...
Equine MicroRNAs: Performance, Reproduction, and Disease. MicroRNAs (miRNAs) are molecules that regulate gene expression by targeting the 3' untranslated region (UTR) of mRNAs. They are essential in numerous biological processes like growth, metabolism, and muscle development. miRNA research has become crucial in livestock breeding, offering solutions for improving animal health and productivity. This review focuses on miRNAs' roles in equine performance, reproduction, and disease, highlighting key findings and future applications in these areas. It discusses the use of circulating miRNAs (ci-miRNA) as biomarkers for athletic performance, particularl...
Clinical evaluation of freeze-dried secretome (lyosecretome) for osteoarthritis: a controlled trial in dogs and preliminary safety assessment in horses. Most in vivo studies on MSC-secretome for osteoarthritis (OA) have relied on animal models, using products lacking pharmaceutical quality, not formulated for clinical use, and insufficiently characterized, limiting knowledge of its effectiveness. This study reports veterinary clinical trials on dogs and horses with spontaneous OA: in dogs (26 subjects), the trial is randomized, double-blinded, and controlled; in horses, 5 clinical cases were treated for safety assessment. Treatment consisted of hyaluronic acid with either lyosecretome - a freeze-dried, injectable MSC-secretome obtained through...
Exposure of horses to biotoxins, phytoestrogens, and pesticides from different feed materials and supplementary feeds. The occurrence of biotoxins and chemical residues in marketed horse feeds has direct influences on horse health but has not been studied yet. Objective: The study investigated the exposure and health implications of contaminants in various horse feedstuffs available on the European market. Methods: A total of 108 feed samples representing diverse product categories such as hay, processed roughage products, grains, and various supplementary feeds were collected from different European countries and analyzed for contaminants, including mycotoxins, phytoestrogens, pesticides, and veterinary drug ...
Equine botulism. Botulism is a severe and often fatal disease in equine patients worldwide. Clostridium botulinum is a ubiquitous soil organism which produces a potent neurotoxin resulting in neuromuscular blockade and flaccid paralysis in affected animals. Definitive diagnosis is often impractical or impossible, leading to diagnosis and treatment based on clinical experience and presenting signs. Delay in case identification and treatment results in rapid deterioration of the patient. Treatment of recumbent equine botulism cases presents challenges due to patient size and requires intensive nursing care. This...
Molecular detection of the Escherichia coli heme-utilization gene A virulence factor in E. coli isolated from the feces of horses in Sumbawa island, Indonesia. The transmission of () containing virulent genes from animals to humans and the environment poses significant public health challenges. This study aimed to detect the virulence factor of the () in isolated from the feces of apparently healthy horses in the island of Sumbawa, Indonesia. The study utilized 52 fecal samples from a total horse population of 283, calculated using the disease detection formula. Fresh feces were collected immediately after excretion and placed in buffered peptone water for subsequent analysis. The samples were then isolated on eosin methylene blue media and identi...
Diagnosis and Minimally Invasive Surgical Treatment for Enhancing Intrathecal/Intrasynovial Tendon Injuries. Intrathecal and intrasynovial tendon and ligament injuries can result in extrusion of tendon/ligament fibers, granuloma, and adhesion formation that not only impairs healing of the original injury but can create new injuries that negatively affect adequate healing and return to athletic work. In these cases, endoscopic evaluation and debridement, not only of the lesion, but also any other secondary injury present, can enhance the healing of the tendon or ligament and improve the athletic prognosis. Careful planning of the approach, positioning, instrumentation, and thorough knowledge of the an...
Guidelines for Formulating Rehabilitation Strategies for Equine Tendon and Ligament Injuries. Rehabilitation for tendon/ligament injury requires a multimodal approach to reduce pain, restore range of motion, improve proprioception/neuromotor control, and improve strength/endurance. Multiple tools are available to accomplish these goals. The rehabilitation program must be tailored to the individual patient regardless of injury type in order to return the horse to full athletic activity and reduce the risk of reinjury.
Current and Emerging Quantitative Imaging Modalities for Diagnosing and Monitoring Equine Tendon and Ligament Injuries. Technological developments in imaging modalities have advanced the diagnostic capabilities for equine tendon and ligament injuries beyond the traditional methods. This review examines elastography techniques in ultrasonography that assess tissue stiffness and strain properties, computed tomography (CT) innovations including PET/CT fusion and dual-energy CT, and emerging applications of diffusion-weighted MRI for evaluating fiber microstructure and functionality. These complementary approaches offer veterinarians improved means to detect early injuries, assess structural integrity, monitor heal...
Nebulization of an mRNA-encoded monoclonal antibody for passive immunization of foals against Rhodococcus equi. Inhalation of Rhodococcus equi causes severe pneumonia in humans and animals worldwide, most commonly affecting horse foals. The standard for preventing R. equi pneumonia in foals is transfusion of hyperimmune plasma, which is expensive and carries the risk of adverse effects. Our goal was to passively immunize foals against R. equi by nebulizing mRNA encoding an equine monoclonal antibody (mAb) against the virulence-associated protein A (VapA) directly into the lungs. VapA-specific memory B cells from an immunized horse were used to identify and select the sequence for an equine immunoglobuli...
Diagnosis and Strategies for the Treatment of Infectious Equine Tendon and Ligament Disorders. Diagnostic and treatment strategies for infectious equine tendon and ligament disorders are continually evolving where recent progress is focused on advanced imaging and evidence supporting endoscopic lavage and regional antimicrobial therapy.
Techniques for Equine Tendon Tenorrhaphy. Equine tendon lacerations are not uncommon secondary to traumatic wounds and degloving lacerations. These wounds are often contaminated and, therefore, basic principles of wound assessment and management are critical to identify the extent of an injury. Ancillary tools to aid physical examination include radiography, ultrasonography, and synoviocentesis (eg, if involving a joint and/or tendon sheath). Prolonged convalescence period, continued external coaptation, and controlled exercise are mainstays of treatment following tenorrhaphy. A poor prognosis for return to full athletic function is e...
Suspensory Ligament Injuries: Diagnosis and Treatment. The location of a suspensory ligament (SL) injury heavily influences the clinical presentation, prognosis, and treatment options. Diagnostic imaging is necessary to provide an accurate diagnosis and is critical to ensure the institution of the most appropriate treatment. The hindlimb proximal SL in particular can be challenging to diagnosis, carries a guarded prognosis, and typically requires aggressive treatment to achieve soundness.
Structure Function Relationships in the Aging Superficial Digital Flexor Tendon: Implications for Injury. The high stresses and strains experienced by the superficial digital flexor tendon (SDFT) make it prone to age-related injury. The SDFT exhibits cellular and structural specializations, localized to the interfascicular matrix (IFM), enabling it to resist its extreme mechanical environment. With aging, these specializations are lost, impacting the ability of the tendon to withstand repeated loading. Within the IFM, there is loss of mechanical properties and organization accompanying cell senescence and a decreased resolution of inflammation. Developing therapeutics to reverse these changes may,...
Current Practices and Considerations in Therapeutic Farriery for Equine Tendon and Ligament Injuries. The overall objective of therapeutic farriery for equine tendon and ligament injuries is to provide a biomechanical environment conducive to healing by limiting excessive strain on the injured structure. With an understanding of equine limb anatomy and the pathophysiology of tendon/ligament injuries, the rationale used in therapeutic farriery for soft tissue injuries of the distal limb is quite logical. Through therapeutic farriery, foot manipulation is used to reduce the tension on the injured tendon(s) or ligament(s).
Cellular and Matrix Dynamics of the Equine Tendon. Our understanding of tendon homeostasis and repair following injury has made great strides through basic science, clinical veterinary medicine, and preclinical translational research. We have now gleaned a greater understanding of the cellular and matrix dynamics that are being orchestrated within the tendon, which provide therapeutic opportunities. This article will focus on how utilizing the horse and equine tissues have advanced our understanding of tendinopathy and the cellular and matrix dynamics at play while also identifying continued gaps in our knowledge where the horse as a veterinar...
Good response to oxymetholone in adult aplastic anemia. In Thailand, stem cell transplantation and horse antithymocyte globulin (ATG) are not accessible for most adult aplastic anemia (AA) patients. Alternative therapies are required. We conducted a cohort study of 110 adult AA patients treated with oxymetholone alone for at least 30 days from 2013 to 2023. Response at month 6 and prognostic factors were evaluated. The mean age was 63.4 years old and 58.2% were female. Severe and very severe AA (SAA/VSAA) comprised 64.5% and 3.6%, respectively. The initial oxymetholone daily dose was 150 mg in 66.4%. The overall response was 56.4% (50.7% for SAA/V...
Adjunct Therapies for Tendon/Ligament Healing: Therapeutic Laser and Extracorporeal Shockwave Therapy. High-power laser therapy and extracorporeal shock wave therapy (ESWT) can be safely used to treat tendon and ligament injuries in horses, and the potential beneficial effects have been described. The power of low level lasers is not sufficient for treatment of tendon and ligament injuries in horses. ESWT is used more often to treat tendon and ligament injuries than it is for any other type of condition in horses, but there is limited supporting scientific evidence. Further research should focus on establishing dosage and treatment protocols for both laser therapy and ESWT in horses with clinic...
Current and Emerging Biologic Therapies for Equine Tendon and Ligament Injuries. This review explores the use of biologics in the treatment of tendon and ligament injuries in horses, focusing on current and emerging therapies aimed at enhancing tissue repair and regeneration. It discusses the role of scaffold-based therapies, growth factors, blood-derived and tissue-derived biologics, and gene therapy as biologic regenerative therapies for improving healing outcomes. The review evaluates the mechanisms, efficacy, and challenges of biologics in clinical applications, highlighting recent advances and clinical studies. It provides an overview of current trends and future dire...
Coxiella burnetii detected in Rhipicephalus sanguineus ticks collected in Portuguese autochthonous livestock. Coxiella burnetii is a bacterium that causes coxiellosis in animals and Q fever in humans. While ruminants are the main reservoirs, the role of ticks in their transmission is still uncertain. This study looked for C. burnetii in ticks collected from two autochthonous breeds in Portugal: Churra Galega Mirandesa sheep and Garrano horses. A total of 555 ticks were tested, including 100 Rhipicephalus sanguineus sensu (s.) stricto (s.) from sheep and 455 Rhipicephalus bursa from horses. Coxiella burnetii was found in 7 % of R. sanguineus s.s., but not in R. bursa. Phylogenetic analysis confirmed th...
Navigated minimally invasive puncture of the trigeminal cistern in horses-a cadaveric study in preparation for a controlled rhizotomy. Trigeminal-mediated headshaking is a neuropathic disorder in horses, characterized by signs of regional pain similar to trigeminal neuralgia in humans. The injection of glycerol into the trigeminal cistern to ablate pain-conducting nerve fibers within the trigeminal ganglion -known as glycerol rhizotomy- is a well-established treatment in human medicine. This study compares two approaches to the equine trigeminal cistern using a navigation system for guiding needle placement, a previously described ventral and a newly developed transmandibular lateral approach. The surgical accuracy and risk o...
Mechanical Stimulation of Equine Bone Marrow Mesenchymal Stromal Cell-Derived Cartilage-Like In Vitro Model Triggers Osteoarthritis Features. Osteoarthritis (OA) affects millions of people globally, causing irreversible cartilage damage, chronic inflammation, and progressive joint dysfunction. Similarly, horses can develop OA spontaneously or due to their athletic careers, influenced by mechanical and biochemical factors. Current treatments primarily focus on symptom relief without promoting cartilage regeneration. In line with the 3Rs principles (refine, reduce, replace), the development of OA models is essential for advancing new therapeutic approaches against OA. In response to this need, the present study aimed to develop an m...
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