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BCG Immunotherapy in Equine Sarcoid Treatment: Mechanisms, Clinical Efficacy, and Challenges in Veterinary Oncology. Equine sarcoids are the most common dermatological neoplasm in horses worldwide, associated with bovine papillomavirus (BPV) infection and characterized by high recurrence rates after conventional therapies. Bacillus Calmette-Guérin (BCG) immunotherapy has historically been used for sarcoid treatment, yet its role in contemporary veterinary oncology remains debated. This narrative review critically examines the immunological mechanisms, clinical efficacy, and limitations of BCG in equine sarcoid therapy, while integrating insights from comparative oncology and One Health perspectives. A syste...
Ex vivo biomechanical testing of a three-dimensional printed titanium plate and spacer construct and 4.5 mm locking compression plate for ventral cervical fusion of C4-C5 in the horse. To compare the biomechanical properties of a three-dimensional (3D) printed titanium plate and spacer (3DM) and a 4.5 mm broad locking compression plate (LCP) for intervertebral fusion of C4-C5 in the horse. Methods: Ex vivo experimental study. Methods: Twenty-four equine cadaveric cervical spines. Methods: Twenty-four cadaver equine cervical spines were randomly assigned to ventral intervertebral fusion with either 3DM (n = 12) or LCP (n = 12) at C4-C5. Four-point bending tests were performed in flexion (3DM n = 6, LCP n = 6) and extension (3DM n = 6, LCP n = 6) in a sin...
Cervical epidural catheter for administration of detomidine and morphine in a model of carpal synovitis in the horse. To determine the analgesic effects of detomidine and morphine administered by cervical epidural catheter (CEC) on a model of thoracic limb pain. Methods: Prospective, randomized, blinded crossover study. Methods: Five adult horses. Methods: Cervical epidural catheters were placed under ultrasound guidance, followed by induction of lipopolysaccharide (LPS)-mediated carpal synovitis. Horses received either saline or detomidine/morphine (DM; 10 μg/kg, 0.1 mg/kg, respectively) via CEC 4 h after synovitis. After a 7 day washout, synovitis was induced in the contralateral carpus, and the alternate ...
Horses (Equus caballus) successfully solve an object choice task using a human pointing gesture and a physical marker: A partial replication of Proops et al. (2010). Like other domesticated species, most notably dogs, horses have been reported to follow human gestures and successfully use them to gain rewards in an object choice task. Empirical support for the hypothesis that a domain-general mechanism may underlie this ability comes from studies in which horses have successfully solved the task by using not just a human pointing gesture but also an arbitrary physical cue, namely a wooden marker. Here, we replicated the two conditions in which these two cues were used by Proops et al. (2010) with two critical changes: first, we positioned the marker out of...
Use of Artificial Intelligence to Detect Cardiac Rhythm Disturbances in Athletes: A Scoping Review. Artificial intelligence (AI) is increasingly used to enhance electrocardiogram (ECG) interpretation in human medicine. In equine athletes, exercise-associated arrhythmias are common and linked to sudden cardiac death at rates higher than in humans. However, ECG interpretation in horses remains time-consuming and subjective, with the clinical relevance of mild rhythm disturbances often unclear. Objective: Evaluate the application of AI to ECG interpretation for arrhythmia detection, with emphasis on current and potential use in athletic species, particularly horses. Methods: About 17 studies we...
Extraskeletal chondroma of the tongue in a two-year-old quarter horse colt: a case report. Extraskeletal chondromas (ESCs) are rare benign tumours composed of mature cartilage that typically develop in soft tissues. Their occurrence in horses is extremely uncommon and, to the authors' knowledge, no previous cases of lingual ESCs in equines have been reported. This report describes a two-year-old Quarter Horse colt presented with progressive dysphagia. Clinical examination revealed a solitary, multilobulated, firm-elastic mass located at the dorsal aboral portion (base) of the tongue. Diagnostic imaging ruled out bone involvement. The mass was surgically excised under general anaesth...
Horseback opinions: what do visitors see when they see the wild horses that concern conservation biologists? Social conflicts surrounding invasive alien species can hinder their management, which makes studying the human dimension increasingly important. This approach is particularly relevant in natural reserves, where assessing visitors' perceptions of invasive alien species can help guide the design of more effective outreach and engagement strategies. This study examines visitors' knowledge of feral horses, their perceptions of these animals' value and ecological impact, and their acceptance of different management alternatives in a protected grassland area in the Argentine Pampas. We expect that ...
Real-time fluorometric isothermal assays for detection of Streptococcus equi subspecies equi and Streptococcus equi subspecies zooepidemicus in horses: Validation, comparison and evaluation of their clinical application. Infectious diseases significantly impact equine health and welfare, causing illness and death, and loss of productivity globally. One such disease is 'strangles', a highly contagious upper respiratory condition in horses caused by Streptococcus equi subspecies equi (SEE). Diagnostic methods for this pathogen include sensitive molecular assays and less reliable bacterial isolation and biochemical testing. However, the presence of closely related streptococci, such as Streptococcus equi subspecies zooepidemicus (SZOO), may confound diagnosis. Rapid assays for SEE are crucial for outbreak control...
Feasibility and safety of intrathecal transplantation of allogeneic bone marrow mesenchymal stem cells in horses. Mesenchymal stem cells (MSCs) have emerged as a promising alternative for treating neurological disorders due to their neuroprotective, neuroregenerative, immunomodulatory, anti-inflammatory, and anti-apoptotic properties. The use of allogeneic MSCs offers advantages such as the selection of specific cells and their immediate availability. This study aimed to evaluate the safety and feasibility of intrathecal transplantation of allogeneic equine bone marrow-derived MSCs (EqBM-MSCs) in healthy horses. Ten healthy horses (five-12 years old) were randomly divided into two groups. In the control g...
Differences in Plasma Exposure of Cannabidiol and Cannabidiolic Acid Following Oral Administration to Horses. There has been a growing interest in the use of cannabinoids in horses in recent years. Several studies have reported on the pharmacokinetics of cannabidiol (CBD) in horses. However, cannabidiolic acid (CBDA) has received less attention, despite limited evidence suggesting clinically beneficial effects in other species. Horses were administered 3 mg/kg of CBD, 3 mg/kg of CBDA, and a placebo per os in a crossover design, with a one-week washout period between treatments. Plasma and urine samples were collected and analyzed using ultra high-performance liquid chromatography coupled to tandem...
Agreement between subjective evaluations and a markerless AI-based gait analysis system during lungeing assessment in traditional racehorses. Subjective lameness evaluation during lungeing is routinely performed in equine practice, but its consistency remains limited, especially in cases of mild or complex asymmetry. Objective: This study aimed to assess the agreement between subjective gait evaluations and a markerless AI-based gait analysis system (OAI-MS) in traditional racehorses during lungeing. Intra- and inter-observer agreement of subjective evaluations was also investigated. Methods: 24 traditional racehorses were assessed during routine pre-race inspections (T0) while trotting on a soft surface. Two experienced equine clin...
Ultrasonographic Assessment of Caudal Vena Cava Collapsibility Index, Caudal Vena Cava-to-Aorta, and Femoral Vein-to-Artery Ratios in Healthy Sedated Adult Horses. (1) Background: Ultrasonography of major vessels helps evaluate fluid status and responsiveness in critical human and canine patients. Aims: transrectal and inguinal ultrasonography of caudal vena cava (CVC), aorta (Ao), and femoral artery (FA) and vein (FV) in horses; calculate CVC collapsibility index (CI CVC) and vein-to-artery ratios; compare B- and M-mode; and evaluate repeatability and reproducibility. (2) Methods: B-mode and M-mode video loops were recorded twice by transrectal (Ao, CVC) and inguinal ultrasonography (FV, FA) by two operators on 17 healthy, sedated adult horses. Diameter...
Proteomic profiling of endometrial tissue and plasma from mares with endometrial fibrosis†. Endometrial fibrosis leads to subfertility when periglandular fibrosis impairs endometrial gland function. Identifying distinct protein expressions in mares suffering from this condition is essential for understanding the pathogenesis and developing treatments to delay fibrotic progression. To gain a better understanding of protein dynamics underlying this condition, Data-Independent Acquisition Mass Spectrometry was utilized to comprehensively characterize and compare the equine endometrial and plasma proteome from mares with different severities of endometrial fibrosis. Mares in diestrus wer...
An occupational group with multiple musculoskeletal trauma and precarious employment: jockeys. Jockeys endure considerable physical and psychological demands, rendering them vulnerable to occupational injuries such as fractures, concussions, and soft tissue damage. This descriptive case series presents the medical and occupational histories of three professional jockeys with long-term disabilities following work-related accidents. Each individual commenced their jockey career in early adolescence. All sustained head trauma from horse falls and had histories of hospitalization due to injuries incurred while riding. Documented injuries included rib, vertebral, clavicular, and upper extrem...
Autologous Cancer Vaccines: A Precision Immunotherapy Strategy for Veterinary Cancer Patients. Precision medicine is a therapeutic strategy to provide treatment that is tailored to a specific patient based on factors unique to that individual, such as the genetic makeup or the environment. Autologous cancer vaccines (ACVs) are ideal for a precision medicine approach because they incorporate antigens specific to the patient's tumor and provide an elegant solution to identifying and selecting relevant immunogenic neoantigens. ACVs are an appealing option for veterinary medicine because they are cancer-type and species agnostic. Over the past 50 years, many innovative ACVs have been evalua...
Genetic diversity of equine piroplasmosis agents in Guadeloupe (Caribbeans): first report of Theileria haneyi, evaluation of diagnostic tools and impact of horse movement. Equine piroplasmosis is a major tick-borne horse disease, caused by the intracellular development of piroplasms (Theileria equi sensu lato and Babesia caballi), with significant economic and sanitary consequences. In 2024, 203 blood samples were collected in Guadeloupe (Caribbean) from asymptomatic horses. Using an 18S rRNA nested PCR (nPCR) specific for each equine genus parasite, 79 samples tested positive for Theileria equi and 9 for Babesia caballi, resulting in respective prevalence of 38.9% and 4.4%. Three horses were co-infected. For B. caballi, 18S rRNA sequence analysis revealed the p...
Prevalence of Low Back Pain in Competitive Dressage Riders: A Cross-Sectional Study. Objective: The purpose of this study was to identify the point and lifetime prevalence of low back pain (LBP) among dressage riders and identify riding-related variables that may precipitate LBP.Methods: A cross-sectional, exploratory, quantitative study was conducted using an online questionnaire. One hundred dressage riders competing at preliminary and higher levels were recruited at the South African Equestrian Federation's registered shows. Frequencies and descriptive statistics were performed on each question in addition to cross-tabulations for associations between variables or differenc...
Accidents, Injuries, and Complications in Equine Sports Medicine Practice. The physical stresses on equine athletes are unique and differ across various disciplines. Recognizing these differences is essential for early detection of injuries and effective management of the competition horse's health. Equine sports medicine involves specific challenges and risks that can be reduced through proper care, careful attention to technique, and a deep understanding of the demands of each sport. Proper training, regular monitoring, and sport-specific expertise are crucial in preventing injuries and ensuring optimal performance. By focusing on these aspects, veterinarians and t...
Complications of Respiratory Surgery in the Horse. Respiratory surgery and procedures typically focus on conditions of the upper airway that restrict airflow at rest or exercise. This article focuses on respiratory anatomy and common surgeries of the trachea and larynx in horses. The trachea serves as the airway conduit from the larynx to the bronchi. A variety of upper airway disorders can lead to obstruction and in these instances, tracheotomy is typically utilized to bypass these obstructions and maintain airway patency. Emergency and permanent tracheotomy procedures are discussed. Other common upper airway operations, such as laryngotomy, ...
Exploratory Metabolomic Fingerprinting of Aqueous Humor in Healthy Horses and Donkeys, and in Horses with Ocular Pathologies. This study aims to generate foundational metabolomic data of aqueous humor (AH) in healthy horses and donkeys, and to investigate potential changes or trends in the metabolomic profile associated with age, sex or ocular pathology in horses. The AH metabolomic fingerprint from 5 donkeys and 35 equine eyes (17 controls, 8 with cataracts, 6 with retinal disease and 4 with anterior chamber disease (ACD)) were analyzed using nuclear magnetic resonance (NMR) spectroscopy. A linear mixed-effects model, with individual horse as a random effect and group as a fixed effect, with multiple testing correct...
Complications in Equine Anesthesia. General anesthesia in equine patients is associated with a higher risk of mortality despite improved monitoring equipments and anesthetic techniques most likely due to their large body size, unique physiology and anatomy, behavioral tendencies, and therefore the challenging recovery. Larger body mass, increased age, higher American Society of Anesthesiologists (ASA) status, out-of-hours surgery, and longer duration of anesthesia have been identified as contributing factors increasing the risk of perioperative mortality in equine patients. Especially the recovery period remains a critical time ...
Complications in the Critically Ill Equine Patient. Complications in critically ill equine patients are often related to the underlying disease process but can also be a consequence of diagnostic and therapeutic interventions. Complications can be specific to the affected organ or body system; however, in critically ill patients, they frequently affect the vasculature, acid-base, electrolyte, and fluid balance, energy homeostasis, and coagulation, with systemic consequences. Infrequent monitoring, late detection, failure to adapt therapies, hematologic and biochemical abnormalities, coagulopathies, and systemic inflammation can all contribute t...
Complications of Equine Musculoskeletal Surgery and Procedures. Complications of equine musculoskeletal procedures and surgery are an inevitable occurrence. This article summarizes complications principally encountered by primary equine veterinarians who perform and manage musculoskeletal procedures and surgeries. Topics discussed include complications of musculoskeletal diagnostic procedures, angular/flexural limb deformities, and muscle, tendon, and ligament surgery; surgery of the foot, orthopedic and arthroscopic surgery, and cast management. Each section lists complications encountered and includes diagnostic and treatment considerations. Awareness of...
Comparing the Difference in Traction Between the Bare Hoof, Iron Horseshoes and Two Glue-On Models on Different Surfaces. The interaction between equine hooves and various ground surfaces is a critical factor for injury prevention and performance in modern equestrian sports. Accurate measurement of surface grip is essential for evaluating the effectiveness of different hoof protection systems. This study introduces the Vienna Grip Tester (VGT), a novel sensor-based device developed to quantify rotational resistance-an important parameter for assessing hoof-surface interaction. The VGT utilizes a torque wrench and spring-loaded mechanism to simulate lateral hoof movements under a standardized vertical load (~700 N...
Evaluation of a Chemically Defined, Long-Term Extender for Liquid Storage of Stallion Semen. Efficient use of stallion semen in liquid state is limited by its relatively short shelf-life. A chemically defined extender (Beyond) is now available for long-term liquid semen preservation. The objectives of the present study were to compare Beyond with milk extenders for the preservation of semen at two temperatures, and to evaluate fertility of semen cooled for 4-8 days before artificial insemination. Semen was processed using different extenders: milk, cholesterol (BotuSemen Special); milk-based (INRA 96); and Beyond. Sperm motility, membrane and acrosome integrity, and chromatin struct...
Born to run? Racing and training outcomes, population dynamics and traceability of a Thoroughbred birth cohort. Analyses of industry-level data suggest that around one-third of the UK and Ireland Thoroughbred foal crop fail to enter training. Prospective follow-up of individual horses could provide additional insight, particularly around individuals not attaining specific career milestones. Methods: A Thoroughbred birth cohort was established on stud farms across the UK and Ireland. Training, race performance, sales, export data, destinations and reasons for individuals failing to meet career milestones were collected from stud records, follow-up with owners, stud book and racing authorities' databases,...
Computed Tomography Angiography Diagnosis of a Congenital Intrahepatic Central Divisional Portocaval Shunt in an Arabian Filly. A 1-month-old Arabian filly presented for central neurologic signs that developed shortly after birth. Hyperammonemia and elevated bile acids were identified, prompting abdominal computed tomography angiography (CTA) evaluation on suspicion of congenital portosystemic shunting (PSS). CTA revealed an anomalous vessel connecting the intrahepatic central divisional portal branch and caudal vena cava, with microhepatica and bilateral renomegaly. Necropsy confirmed a single, congenital, and intrahepatic central divisional portocaval shunt. Imaging literature addressing PSS in foals is sparse, with ...
Assessment of the antiparasitic effectiveness of pyrantel pamoate in treatment of Strongylidae invasions in young horses – preliminary studies. The resistance of strongyles to pyrantel pamoate has been reported in publications worldwide. There is no data on its efficacy in horses in Poland. Therefore, the aim of this study was to evaluate the effectiveness of pyrantel pamoate to control strongyle invasions in young horses. The study involved horses of both sexes, aged 1 to 2 years, and was conducted in two seasons (spring and the end of summer). Feces were collected 24 hours before and 14 days after deworming, and they were then examined using McMaster's and combined sedimentation-flotation methods. Results revealed that in spring, th...
Zinc, copper and selenium deficiencies in broodmares in south-eastern Poland. Microelement deficiencies are a current problem in horse breeding, causing infertility and fetal development disorders. The aim of the study was to control the concentration of zinc, copper and selenium in the blood serum of pregnant herd mares. The study included 154 mares in the second half of pregnancy, kept in five regions of south-eastern Poland: Łęczyńsko-Włodawska Plain, Chełmskie Hills, Łukowska Plain, Beskid Niski and Działy Grabowieckie. The concentration of zinc, copper and selenium in the obtained blood serum was determined using atomic absorption spectrophotometry. The seru...
Introduction of West Nile virus lineage 2 leads to neuroinvasive cases in humans and horses in Sicily, 2022-2023. In Italy, West Nile virus (WNV) has been consistently causing disease in humans, horses, and birds since 2008; it was initially confined to the northeast of the country and then spread gradually to the western and southern regions. WNV lineage 1 (WNV-L1) virus was the only lineage that circulated in Italy until 2011, but it was progressively replaced by WNV lineage 2 (WNV-L2). WNV disease in humans was not observed in Sicily, southern Italy, until 2016, when the first case of West Nile neuroinvasive disease (WNND) due to WNV-L1 was reported. Our results demonstrate the introduction of WNV-L2 i...
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