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Detection of Pathogenic Leptospira DNA in Cervicovaginal Mucus of Mares With Reproductive Disorders in a Brazilian Herd. Leptospirosis is a zoonotic disease caused by pathogenic bacteria of the genus Leptospira. A lesser-known form, equine genital leptospirosis (EGL), has been identified as a chronic and often silent infection involving the colonisation of the mare's genital tract. Despite its potential impact, EGL remains underdiagnosed and poorly understood, particularly in its association with reproductive inefficiency. This study showed the presence of Leptospira spp. DNA by lipL32-PCR in the genital tract of mares with a history of reproductive disturbances. Cervicovaginal mucus samples were collected from ...
Analysis of IgG responses to Sarcocystis neurona in horses with equine protozoal myeloencephalitis (EPM) suggests a Th1-biased immune response. Equine protozoal myeloencephalitis (EPM) caused by Sarcocystis neurona is one of the most important neurological diseases of horses in the Americas. While seroprevalence of S. neurona in horses is high, clinical manifestation of EPM occurs in less than 1 % of infected horses. Antemortem diagnosis has proven challenging as serum antibodies against S. neurona are an indicator of infection but not necessarily disease. Factors governing the occurrence of EPM are largely unknown, although horse immunity might contribute to EPM pathogenesis. Immunoglobulin G is the predominant antibody class in eq...
Xenogen-free media provide variable equine mesenchymal stromal cell expansion after a 7-day culture period. To determine the xenogen-free serum source that provides the greatest number of live equine mesenchymal stromal cells (MSCs) while maintaining the MSC phenotype. Unassigned: Equine bone marrow-derived MSCs from 8 horses were cultured for 7 days in media containing one of the following serum treatments: 10% xenogeneic serum, 10% or 20% commercial allogeneic equine serum, 10% autologous serum, 10% equine pooled platelet lysate (PPL), or a staged media reduction of xenogeneic media. Live cell numbers, MSC viability, and MSC immunophenotype were compared. Unassigned: The use of 10% commercial allo...
Midline vs. flank laparotomy- criteria for choosing the optimal surgical technique for uterine torsion correction in the mare. Uterine torsion in mares belongs to maternal pregnancy disorders, accounting for 5-10% of complications in the last trimester of pregnancy. Two surgical techniques for repositioning uterine torsion are used: flank laparotomy in local anesthesia on a standing mare (SFL) and midline laparotomy carried out under general anesthesia (MI). The study aims to present the exact protocol used by the authors to qualify a mare with uterine torsion for surgery using one of the above-mentioned methods.A total of 19 mares were operated on, of which 13 underwent midline laparotomy under general anesthesia, an...
Preliminary clinical study of the arytenoid cartilage abduction grades after prosthetic laryngoplasty with cricoarytenoideus dorsalis myectomy in racehorses. To assess the clinical impact of the cricoarytenoideus dorsalis (CAD) myectomy in the short- and long-term postoperative abduction grade in racehorses. Unassigned: Records from horses presented for surgical treatment of recurrent laryngeal neuropathy from January 2019 through December 2023 were divided into 2 groups: horses that received standard prosthetic laryngoplasty and horses that received a complete myectomy of the CAD (modified myectomy laryngoplasty). Outcomes were compared through endoscopic evaluation after anesthetic recovery, both short term (7 to 10 days) and long term (80 to 90 ...
Adverse Effects and Drug Reactions in Equids. Adverse drug events (ADEs) are any harms caused by medical interventions used for treatment, prevention, or diagnosis. These events can happen due to human error or as unintended, harmful reactions to drugs when given at normal therapeutic doses. This review focuses on common ADEs associated with drugs frequently used in equine practice. Recognizing and understanding the manifestations of ADEs can help with early detection and more effective management, ultimately leading to better outcomes for equine patients. Additionally, knowledge of the potential harmful effects of drugs also aids in appr...
Radiographic Evaluation of Equine Odontoclastic Tooth Resorption and Hypercementosis (EOTRH) in Horses Living Under Natural Conditions in Iceland. Outside of Iceland, the Icelandic horse is prone to the development of Equine Odontoclastic Tooth Resorption and Hypercementosis (EOTRH). The aim of this study was to determine the radiographic prevalence and clinical signs of EOTRH in elderly horses (≥15 years) in Iceland. The rostral oral cavity of 170 horses (aged 15-30 years) was examined clinically. In addition, husbandry and nutritional management history was recorded by use of a questionnaire. Radiographs (2-4 views) of 188 horses were evaluated, findings were categorized by numerical staging of the condition and collated with clinica...
Better hoof, better horse – genetic correlations between ability to race barefoot and performance in trotting horses. Harness racing is popular in several parts of the world, and the ability to race barefoot is an important trait for success because of its effect on racing time. Barefoot racing is also discussed in terms of animal welfare because not all horses have hooves that tolerate racing without shoes. In Swedish Standardbred trotters (SB) and Swedish-Norwegian Coldblooded trotters (CB), the proportion of barefoot races and the probability to race barefoot in any given race (barefoot status) have low-to-moderate heritability (h = 0.07-0.28). However, the genetic correlation between the ability to race...
Development of African horse sickness disabled infectious single animal (DISA)-DIVA vaccine platform applied for all nine serotypes. African Horse Sickness (AHS) is a devastating vector-borne viral disease of equids with a mortality up to 95 % in naïve domestic horses. The causative African horse sickness virus (AHSV) is a distinct species of the genus Orbivirus of the family Sedoreoviridae, consisting of nine serotypes showing limited cross protection. AHSV is transmitted by Culicoides biting midges. Outbreaks cause huge economic losses in developing African countries. AHS has become a serious threat for countries outside Africa, since endemic Culicoides species in moderate climates appear competent vectors of the closel...
A retrospective study of 171 cases of equine meningoencephalomyelitis in the United States, 1996-2023. Equine meningoencephalomyelitis is an important cause of morbidity and mortality and is associated with a wide variety of infectious etiologies. Because of the lack of large retrospective studies, the prevalence and incidence of these diseases are unknown. Here we describe 171 cases of meningoencephalomyelitis in horses submitted to the Section of Anatomic Pathology at the New York State Animal Health Diagnostic Center (Cornell University, Ithaca, NY, USA) from 1996-2023. Neuroinflammatory disease was identified in 5.4% of submitted horses with a wide breed, age, and sex distribution. A parasi...
Bridging Breeds: Transcriptomic Insights into Immune Traits of Yili, Thoroughbred, and Kazakh Horses. Studying the genetic characteristics and molecular mechanisms of immune regulation in horses is of great significance for protecting their genetic resources, improving breeding strategies, and enhancing their disease resistance, thereby ensuring their healthy performance in both sports and production. Objective: This study investigates the genetic characteristics and molecular mechanisms underlying immune regulation in Yili horses, comparing them with Thoroughbreds and Kazakh horses. Methods: Blood samples from each breed were analyzed for physiological, biochemical, and immune indices alongsi...
Behavioral and orthopedic issues in geldings with Postcastration adhesions: A retrospective study of 35 cases. Limited data is available on the diagnostic and therapeutic methods for pathologies caused by scarring after castration. It is well recognized that specific behaviors or untypical hindlimb lameness may be observed in geldings with gelding scars and adhesions caused by spermatic cord remnants after castration OBJECTIVES: To describe how to diagnose movement disorders associated with excessive adhesions caused by spermatic cord remnant after castration and to present a successful surgical treatment method. Methods: To assess the impact of gelding scars on horses' movement and behavior, medical r...
Single-Cell Transcriptomic Profiling of Longissimus Dorsi and Biceps Femoris Muscles in Kazakh Horses Reveals Cellular Heterogeneity and Myogenic Regulation. Kazakh horses are renowned for their endurance and adaptability, with distinct muscle groups such as the longissimus dorsi (LD) and biceps femoris (BF) muscles serving specialized functions. However, the molecular mechanisms underlying the functional specialization of these muscles in Kazakh horses remain poorly understood. This study aims to address this gap by utilizing single-cell RNA sequencing (scRNA-seq) to investigate the transcriptomic differences between these muscle groups, with a focus on understanding their molecular adaptations. Our analysis revealed that the BF muscle, specialize...
Comparing Genomic and Pedigree Inbreeding Coefficients in the Slovenian Lipizzan Horse as a Case Study for Small Closed Populations. In small, closed populations such as the Lipizzan horse, maintaining genetic diversity while limiting inbreeding is a key challenge in conservation breeding. The Lipizzan is an indigenous Slovenian breed with a small population and restricted gene flow from other subpopulations. Inbreeding is traditionally monitored with pedigree-based coefficients, but these often underestimate realised autozygosity, particularly when pedigree depth is limited. This study compared pedigree-based inbreeding (F_PED) with four genomic estimators (F_HOM, F_ROH, F_HBD, F_GRM) in 329 Slovenian Lipizzan horses genot...
Physiological and Behavioral Responses of Stabled Horses (Equus caballus) to Three Types of Environmental Enrichment. Small stalls and regulated feedings restrict horses' natural foraging and locomotion, increasing risks to welfare. Environmental enrichment may promote more naturalistic behavioral time budgets, yet little is known about how enrichment type or timing affects physiology and behavior. This study examined nine stabled Quarter Horses provided with hay feeders, activity balls, or mirrors across randomized trials. Each trial included 30 min observations, four times per day, with enrichment removed between sessions and 5-day washouts between trials. Nightwatch Smart Halters™ recorded heart and resp...
Helminth control practices used by equine keepers in France: a national survey. In light of the increasing reports of anthelmintic (AH) resistance in equids, a national survey on helminth control practices was distributed to 42 528 keepers. A total of 4 344 responses was obtained. Respondents implemented preventive pasture practices with varying frequency according to the age of the animals, such as pasture rotations (78.1-80.6 %), excrement removal from pastures several times a year (15.9-27.2 %) and/or mixed or rotational grazing with ruminants (14.5-18.1 %). A majority of keepers routinely used AH treatments even though they did not perceive any major risk to the...
Interleukin 17A in the fibrotic-related processes in endometrosis in the mare. Equine endometrosis is a chronic degenerative condition with fibrosis being one of the most significant characteristics. A growing body of evidence indicates the critical role of interleukin (IL)-17 in fibrotic disorders. However, its exact role during equine endometrosis remains to be discovered and explained. The main aim of the current study was to establish the expression of IL-17A signaling components in equine endometria with and without endometrosis as well as the effects of IL-17A on the transcriptomic signature, cellular functional characteristics, expression of extracellular matrix (...
Computer-Aided Diagnosis of Equine Pharyngeal Lymphoid Hyperplasia Using the Object Detection-Based Processing Technique of Digital Endoscopic Images. In human medicine, computer-aided diagnosis (CAD) is increasingly employed for screening, identifying, and monitoring early endoscopic signs of various diseases. However, its potential-despite proven benefits in human healthcare-remains largely underexplored in equine veterinary medicine. This study aimed to quantify endoscopic signs of pharyngeal lymphoid hyperplasia (PLH) as digital data and to assess their effectiveness in CAD of PLH in comparison and in combination with clinical data reflecting respiratory tract disease. Endoscopic images of the pharynx were collected from 70 horses clinic...
Retrospective Assessment of Carbonic Anhydrase Inhibitors in Topical or Episcleral Implant Form for the Treatment of Equine Glaucoma. To assess whether topical carbonic anhydrase inhibitors (CAIs) with or without episcleral brinzolamide implants control intraocular pressure (IOP) in horses with glaucoma. Methods: 12 client-owned horses diagnosed with glaucoma. Methods: Medical records of horses treated with topical CAIs for ≥ 14 days, with a subset receiving episcleral brinzolamide implants, were reviewed. Diagnosis, signalment, concurrent ocular disease, medications, IOP, visual status, and additional procedures were recorded. Treatment failure was defined as horses with IOP > 30 mmHg resulting in phthisis bulbi o...
Effects of oral and intravenous dimethylglycine treatment on hematobiochemical profiles and total oxidant/antioxidant status in low-intensity exercised horses. Dimethylglycine (DMG) may help delay muscle fatigue and prevent exercise-induced muscle damage in athletic animals. This study investigated the effects of intravenous and oral DMG on physiological, hematological, biochemical, blood gas, and oxidative stress parameters in exercising horses. In this study, 30 Turkish Arab saddle horses were randomly divided into three groups. Group A horses were injected intravenously with 15 mL (1500 mg) of a 10 % DMG twice daily for three days. Group B horses received 1500 mg DMG powder orally twice daily for three days, and group C (control) horses we...
Differential effects of flunixin meglumine and meloxicam on TNF- α production in LPS-stimulated equine neutrophils in vitro. Systemic inflammatory response syndrome (SIRS) induced by endotoxemia is usually secondary to colitis and is a major cause of high morbidity and mortality in horses. Non-steroidal anti-inflammatory drugs (NSAIDs), such as flunixin meglumine (FM) and meloxicam (MX), are used to improve clinical outcomes in SIRS/endotoxemia. These NSAIDs suppress tumor necrosis factor-alpha (TNF-α) levels; however, the underlying mechanisms remain unclear. The aim of this study was to investigate the inhibitory effects of FM and MX on TNF-α in lipopolysaccharide (LPS)-stimulated peripheral blood mononuclear ce...
A study of the epidemiology of Anoplocephala perfoliata infection in horses and the oribatid mite vector in southern England. Anoplocephala perfoliata is the most common equine tapeworm infection. This parasite is found at the small/large intestinal junction and has been associated with colic. The cestode has an indirect lifecycle involving oribatid mite intermediate hosts, though little is known of its epidemiology. This study aimed to monitor seasonal fluctuations in pasture oribatid mite numbers and the presence of Anoplocephala spp. DNA in mite samples collected from three equine premises in the UK. Exposure to infection in resident horses was assessed by measuring tapeworm-specific salivary antibodies. The data ...
Activity and behavior patterns of cattle, horses, and sheep grazing in mountainous areas using geolocation collars. The sustainability of extensive livestock systems is compromised. It is necessary to enhance our understanding of the activity and grazing behavior of different livestock species (cows, horses, and sheep) sharing the same mountainous areas. Nowadays, the observation and analysis of animal activity is greatly facilitated by remote tracking technology, especially in zones with difficult access. In this article, we proved that commercial geolocation collars can provide meaningful data on animal activity, behavior, and distribution, which can be used to model daily distances, activity patterns, gr...
Computed tomographic signs of hyoid apparatus disease in 165 horses. Horses with hyoid bone disease may present with clinical symptoms such as exercise intolerance, resistance to ridden work, anorexia, or headshaking. This study aims to describe the computed tomographic (CT) signs and prevalence of hyoid disease and to evaluate their association with other CT changes of the head. Unassigned: In this study, four investigators conducted a retrospective analysis of their findings after reviewing the medical records of 200 horses that had undergone CT scans between 2009 and 2019. A total of 32 parameters were analyzed, and associations were evaluated between those ...
Retrospective performance-indexed analysis of Thoroughbred racehorses undergoing surgical management of proximal sesamoid bone fractures. Proximal sesamoid bone fractures (PSBFs) are a leading cause of economic losses. Post-operative racing prognosis is multi-factorial; however, recent studies are lacking. Objective: To provide an update on racing outcomes for horses undergoing surgical management of PSBFs, analyse variables affecting performance and compare post-operative racing performance with pre-operative data and case-matched controls. Methods: Retrospective case series. Methods: Thoroughbred racehorses that underwent PSBF repair (2008-2022) were included. Data retrieved included fracture type, limb, axiality, treatment, a...
Distal interphalangeal joint capsule enthesopathy of the middle phalanx and articular cartilage loss. Significant distal interphalangeal joint (DIPJ) pathology, particularly affecting soft tissue and articular cartilage, is often not identifiable on radiographs but can be accompanied by joint capsule enthesopathy on the middle phalanx (P2), which can be readily identified. Objective: To explore frequency and correlations between DIPJ capsule enthesopathy identified on magnetic resonance imaging (MRI) and radiographs and DIPJ articular cartilage abnormalities and other concurrent soft tissue or osseous pathology within the foot found on MRI. Methods: Retrospective descriptive case series. Metho...
Antibiotic Use in Horses: Analysis of 57 German Veterinary Practices (2018-2023). : A mandatory monitoring of the use of antibiotics in horses in the European Union will come into force from 2027 on. The aim of the study was to explore the potential implementation of a monitoring system and to provide an overview of antibiotic use in horses in Germany. : Data on all consultations from 57 German practices between 2018 and 2023 were obtained. The dataset included basic data about the horse, free-text diagnoses (allocated to one of 20 categories), and treatments. Information on the administered or dispensed pharmaceutical product was recorded for antibiotic treatment consultat...
A move in the right direction: Tracking the traceability of British Thoroughbreds outside of racing. Horse welfare within/after racing is often questioned by the public. British Racing's Horse Welfare Board's "A life well-lived" strategy provides a blueprint for Thoroughbred welfare, advocating accurate lifetime traceability of horses as essential to achieve this. The Census aimed to establish a population density model for British Thoroughbreds, not actively engaged in racing. Equestrians who owned/kept a Thoroughbred were asked to complete the Census between May and December 2023. Frequency analysis identified patterns in passport compliance, knowledge and understanding of current systems, ...
Multiple Catheter Recording in Horses to Investigate Atrial Depolarization Pattern During Sinus Rhythm and Induced Premature Atrial Complexes. Detailed characterization of arrhythmias can be performed by multiple catheter mapping; but this has not yet been explored in horses. Objective: Perform ultrasound-guided multiple catheter mapping of the right heart during sinus rhythm and right and left atrial pacing to identify activation patterns characteristic of the origin of ectopy. Obtain His signals and effective refractory periods (ERP). Methods: Eight healthy adult horses. Methods: Experimental study. Recording catheters were placed at the terminal crest, intervenous tubercle, caudal vena cava, and coronary sinus. Right atrial pacing...
Isolation and Characterization of Equine Lymph Node Endothelial Cells. In vitro models have revolutionized our understanding of biological pathways and mechanisms, offering a viable alternative to direct patient testing. However, there is a significant lack of models for different animals, particularly equine models. This study presents a novel primary cell culture extracted from a 3-year-old horse diagnosed with multisystemic eosinophilic epitheliotropic disease. Tissue samples were collected from lymph nodes at various locations. Growth curves of extracted primary cells were analyzed and the optimal conditions were assessed. Biomarkers, such as CD31, ZO-1, CD79...
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