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Computed Tomography of the Hyoid Apparatus in Equine Headshaking Syndrome. Headshaking is a common condition in horses, most cases are presumed idiopathic/trigeminal-nerve mediated. Diagnostic work-up of a headshaking horse may involve computed tomography (CT) of the head to exclude causative structural pathology. The relevance of the presence and severity of hyoid apparatus findings at CT to headshaking is unknown. A retrospective analysis of CT changes in the hyoid apparatus in horses was carried out. Comparisons were performed between horses with signs of headshaking and a control population and a subgroup of horses with signs of headshaking and no other 'likely...
Use of 2D-Shear Wave Elastography for the Evaluation of Lens in Horses. Although lens diseases are uncommon in horses, they can be disabling in advanced stages. The B-mode ultrasound is useful for diagnosing and monitoring the progression of ocular diseases such as cataracts. Elastography is an ultrasonographic technique that allows the detection and measurement of tissue stiffness. This observational cohort prospective study aimed to determine the feasibility, reproducibility, and repeatability of 2D-shear wave elastography (2D-SWE) of lenses in horses. Forty-six eyes of 23 horses with no evidence of ocular disease were included in this study. The horses underwen...
The proteomic differences and expression of fatty acid-binding protein 6 (FABP6) associated with gastrointestinal injury in horses with oral administration of a clinical dose of phenylbutazone. Phenylbutazone (PBZ) can potentially induce gastrointestinal ulceration, and early detection of PBZ-induced gastroenteropathy will be useful for the diagnosis, treatment, and prevention of PBZ toxicity. Objective: To identify putative proteins associated with equine gastric ulcer syndrome after clinical dose (4.4 mg/kg) administration of PBZ by proteomic study. Methods: In vivo experiments. Methods: Proteomic analysis using LC-MS/MS compared protein expression in serum and faeces of seven PBZ-treated horses with seven placebo-treated controls, and a novel putative biomarker was validated via...
Development and validation of a quantitative UHPLC-HRMS bioanalytical method for equine anti-doping control. The quantification of banned substances in equine antidoping control, especially in racehorse urine, necessitates robust analytical methods with high detection levels due to the extremely low concentrations of the target substances and the significant impact of minor variations on doping test results. Reliable quantification is important for substances near regulatory thresholds, which, if exceeded, are prohibited. This study presents the development and validation of a bioanalytical UHPLC-HRMS method for quantifying doping substances in equine urine, including diazepam and acepromazine with a...
Blood amino acid changes associated with Lawsonia intracellularis infection in horses. Hypoproteinaemia/hypoalbuminaemia is a typical clinical feature of Lawsonia intracellularis infection in horses, but amino acid perturbations in these horses have not been investigated. Objective: Clarifying blood amino acid levels in horses suffering from Lawsonia intracellularis infection to identify novel aspects of the disease. Methods: Retrospective observational study. Methods: A total of 135 serum samples collected from horses from 59 farms were used in this study. Horses diagnosed with the clinical form of equine proliferative enteropathy (EPE) were enrolled as a clinical group (n =â...
Objective lameness assessment of 235 horses undergoing lameness examination in Brazil: A retrospective study. Lameness, which arises from functional or structural changes in the limbs or axial skeleton, causes asymmetry in the movement of the equine head and/or pelvis. This study aimed to investigate the lameness patterns of horses that underwent lameness examination or monitoring during the years 2016 to 2020. This retrospective study used data from the lameness examination, evaluated using an objective assessment with body-mounted wireless inertial sensors. The lameness examination comprised clinical history, static inspection, palpation, gait evaluation (for which the animals were equipped with a w...
Short-Term Impact of Dry Needling Treatment for Myofascial Pain on Equine Biomechanics Through Artificial Intelligence-Based Gait Analysis. Myofascial pain syndrome (MPS) is a common source of musculoskeletal pain, characterized by trigger points (TrPs). In horses, MPS is frequently underdiagnosed, and evidence on DN effectiveness is limited. This study investigated whether DN can improve the biomechanics in horses using an artificial intelligence (AI)-based markerless smartphone application (app). Fourteen horses participated, including nine used in assisted therapy, four leisure horses, and one with mixed use. The presence of TrPs was evaluated in six muscles through manual palpation: brachiocephalicus, trapezius, gluteus medius...
Targeted pretreatment and inoculation strategies for horse manure fermentation: Impact on metabolites and microbial community composition. Horse manure is a lignocellulosic biomass found in significant quantities with a vast indigenous flora, not yet fully valorized apart from anaerobic digestion. Its use in the fermentation process can lead to the production of higher-value metabolites. This study investigates three inoculation strategies coupled with five pretreatment conditions for horse manure fermentation. Two microwave pretreatments (200W and 1000W) were compared with a conventional thermal pretreatment, a thermo-acid pretreatment, and an unpretreated condition. The sole horse manure indigenous microorganisms were used in f...
Emotional contagion of fear and joy from humans to horses using a combination of facial and vocal cues. Emotional contagion, the emotional state-matching of two individuals, has been documented in various species. Recent findings suggest emotional contagion could also take place between humans and domestic mammals. However, the range of targeted animal species and human emotions that have been studied is still limited, and the methodology to investigate emotional contagion in this context is not fully established. This study examined emotional contagion of fear and joy from humans to horses by measuring physiological (heart rate, infrared thermography) and behavioral responses (posture, laterali...
Wastewater surveillance as a tool for understanding West Nile virus transmission and distribution in Oklahoma. West Nile Virus (WNV) is the most widespread and frequently reported mosquito-borne disease in the US, with a high risk of outbreaks. Accurate surveillance of WNV is complicated by many mild or asymptomatic infections, resulting in human cases being under-reported and disease distribution and transmission not being well understood. In this study, we investigated how wastewater surveillance can be used for monitoring WNV in Oklahoma. We analyzed samples collected from wastewater treatment facilities in 16 counties during July 1 to September 31, 2023, for the presence of WNV genetic material and...
Assessing thermal changes in the equine thoracolumbar region following different capacitive-resistive electrical transfer protocols. Capacitive-resistive electrical transfer (CRET) is an endogenous non-invasive technique, used as deep diathermy. We pursue to analyze the temperature changes by applying different CRET protocols in the thoracolumbar spine of horses, between thoracic vertebrae 15 and lumbar 2. Unassigned: Ten clinically sound horses without thoracolumbar pain underwent various CRET protocols applied to a standardized thoracolumbar region (T15-L2). The protocols included sham (device off), low intensity (LIP, 5%), medium intensity (MIP, 30%), and high intensity (HIP, 40%). The HIP protocol was further divided in...
Confirmation of a novel, stable estrogen metabolite, as 5a,6a-epoxy-estrone sulfate in stallion blood by LC-MS/MS. Mass spectrometry (MS) has become pivotal for accurately delineating intricate molecular structures for steroids present in minute quantities within biological samples. This study utilized liquid chromatography-high resolution tandem mass spectrometry (LC-HRMS/MS) to identify and characterize a 'new' estrogen metabolite, 5α,6α-epoxy-estrone sulfate, in stallion serum from three animals. The estrogen structure was predicted previously using radiolabeled steroids. HRMS/MS, in combination with a seamless sample preparation involving liquid-liquid extraction and chromatographic separation, enabl...
Assessment of Common Hematologic Parameters and Novel Hematologic Ratios for Predicting Piroplasmosis Infection in Horses. Equine piroplasmosis (EP) is a tick-borne disease affecting equids worldwide. Diagnosis is based on direct methods (blood smear or PCR) or indirect methods (serology); however, these techniques yield positive and negative results. Thus, an alternative, reliable, rapid, and cost-effective complementary tool, such as hematologic parameters and newly described hematologic ratios, could help in the EP diagnosis. This study describes the changes induced by piroplasmosis infection on hematologic parameters and ratios in horses. PCR-positive horses exhibited anemia and thrombocytopenia, whereas PCR...
Understanding antimicrobial use by equine owners in Wales: Using cross-sectional survey and semi-structured interviews. Antimicrobial resistance (AMR) is an increasingly serious threat to human and animal health. Antimicrobial use (AMU) in horses is gathering research interest, although there remain significant evidence gaps. Currently, there is scant qualitative research into equine owners' use of antimicrobials, specifically antibiotics, hindering the design of evidence-based stewardship interventions and policies. Objective: To understand Welsh equine owners' views and behaviours relating to antimicrobial usage. Methods: Cross sectional survey and qualitative data collection and analysis. Methods: An online ...
Auditory enrichment on facial and physiological responses of Pantaneiro geldings and mares under short-term stress. This study aimed to evaluate the effect of auditory stimuli on mares and geldings during social isolation and movement restriction, and their ability to promote the reduction of stress responses. The research was conducted with eight Pantaneiro horses, divided into Experiment I (4 mares) and Experiment II (4 geldings), both experiments were executed equally using a 4x4 Latin square design with experimental (classical, country and new age) and control (no music) treatments. Physiological parameters (heart rate, heart rate variability, respiratory rate, ocular temperature by infrared thermograph...
Doping Control of Ranitidine in Horses. Ranitidine is a histamine H-receptor antagonist commonly used to treat gastric ulceration in horses. The author's laboratory conducted a study some years ago in the early 2000s on its metabolism as well as its urinary elimination profile in two geldings. With the technology advancement as well as popularity of blood for doping control testing, the laboratory has recently conducted another administration trials of the substance in six horses to study the in vivo metabolism of ranitidine, aiming to identify and reinvestigate the appropriate target(s) for controlling misuse of ranitidine in hors...
The relationship between post-thaw sperm quality parameters and blastocyst production following Intracytoplasmic Sperm Injection (ICSI) of in vitro-matured equine oocytes. In vitro production of equine embryos by Intracytoplasmic Sperm Injection (ICSI) is commonly utilized to maximize the availability of stallion sperm, particularly from stallions with limited semen supply. The relationship between standard measures of sperm quality in frozen/thawed semen (i.e., sperm motility, normal morphology, DNA quality) and embryo production after ICSI of in vitro-matured equine oocytes has not been thoroughly studied. In this study, frozen/thawed semen from 47 stallions utilized in a commercial ICSI program was analyzed for post-thaw sperm total and progressive motility (...
Survey of veterinarians’ usage and satisfaction with intra-articular polyacrylamide gel in horses. Polyacrylamide gel is increasingly used in equine veterinary medicine for osteoarthritis and other joint disorders. This study aimed to document the indications, treatment protocols, rehabilitation plans, outcomes, and satisfaction with intra-articular polyacrylamide gel in horses, as reported by equine veterinarians. An online questionnaire was distributed to practitioners through the European and American Colleges of Veterinary Sports Medicine and Rehabilitation mailing lists, social media, and direct contact. Of 197 respondents, 160 completed the survey, forming the basis for the descriptiv...
Evaluation of an intra-articular carboxymethylcellulose crosslinked hydrogel in horses with osteoarthritis. Numerous treatment strategies have been proposed to manage osteoarthritis (OA) in sport horses. Carboxymethylcellulose (CMC), is used in veterinary medicine for various purposes. Objective: This study aimed to assess the efficacy of a CMC hydrogel in reducing clinical lameness in horses with OA affecting joint. The hypothesis was that intra-articular CMC would produce a sustained reduction in lameness compared to a control treatment. Methods: Thirty client-owned horses diagnosed with OA-related lameness in the metacarpophalangeal joint were enrolled. Horses were randomly assigned to two groups...
Western performance horses with fetlock lameness demonstrate radiographic evidence of chronic exercise remodelling. Pathological changes of the fetlock joint are well documented in Thoroughbreds, but little information is available describing the common radiographic findings in western performance horses with fetlock lameness. Objective: To describe radiographic findings in western performance horses with fetlock lameness. It was hypothesised that the degree of lameness would correlate with the severity of radiographic findings. Methods: Retrospective case series. Methods: Retrospective review (2012-2022) of horses with lameness isolated to the fetlock joint via intra-articular analgesia and corresponding r...
Molecular detection of pathogens in an equine fever diagnostic panel: 2019-2023. A common diagnostic approach for febrile horses is to test for a panel of potential pathogens. Panels are curated by expert opinion and vary between diagnostic laboratories. Objective: To report the results of a newly developed equine fever diagnostic panel (EFDP) between 2019 and 2023 and evaluate the frequency of positive results. Methods: Retrospective descriptive study. Methods: The EFDP requires submission of whole blood, nasal swab, and faecal samples, and includes PCR tests for 12 pathogens that can present as fever without localising signs of illness or infection. Submission metadata a...
Validation of the Equine Urticaria Activity Score for the assessment of chronic recurrent urticaria in horses. Recurrent urticaria is common in horses. The pathophysiology is poorly understood and treatment options are limited. Often, only glucocorticoids are effective for controlling clinical signs, albeit with potential adverse effects. Studies investigating new treatments need a validated objective scoring system for the grading of skin lesions to assess response. Objective: The aims were to investigate inter- and intraobserver reliability of the Equine Urticaria Activity Score (EqUAS) for the grading of skin lesions in horses with recurrent urticaria, and to examine agreement between experienced an...
Confirmation of the presence of Hemotropic Mycoplasma species in working equids from Veracruz, Mexico. Hemotropic mycoplasmas (HM) are emerging pathogens known to infect a wide range of mammals, including ungulates like horses. These infections can lead to severe haematological conditions, posing a threat to animal health and welfare. Recent studies have begun shedding light on the prevalence and impact of HM on horse populations worldwide. For instance, in Germany, Iran, Nigeria, and Brazil, at least three species of HM have been identified in horses, with a lack in knowledge in Latin American countries like Mexico. Our research aims to fill a crucial knowledge gap regarding the presence of HM...
Seroepidemiological study of Toxoplasma gondii in equines in Northern Egypt. Toxoplasmosis, caused by the intracellular protozoan (), continues to be a widespread parasitic zoonotic disease globally. The seroepidemiology of infection in Egyptian equids, particularly donkeys, remains insufficiently explored. The present study was designed to assess the seroprevalence of in equines from Northern Egypt. Unassigned: A total of 360 serum samples from two equine species (157 horses and 203 donkeys) were obtained during 2023. The Modified Agglutination Test (MAT, cut-off of 1:25) was used to screen for the anti- antibodies. The study also analyzed potential risk factors th...
Equine viral arteritis: Seroprevalence patterns and risk factors in equids from western Europe. Equine viral arteritis is a notifiable infectious disease with sanitary and economic implications at a global scale. A cross-sectional serosurvey was performed to determine the exposure of equids to the Alphaarterivirus equid [Equine Arteritis Virus (EAV)] in three regions in western Europe. Serum samples from 1425 equids (1196 horses, 104 donkeys, and 125 mules/hinnies) from Catalonia (northeastern Spain), Andalusia (southern Spain) and southeastern United Kingdom (UK) were collected during the period 2011-2023. The overall EAV seroprevalence in EAV-unvaccinated equids was 9.7Â % (138/1425; 9...
Transcriptomic responses of equine skeletal muscle to acute exercise in a hot environment. While exercise performance deteriorates in hot environments, heat stress may contribute to exercise-induced adaptations in skeletal muscle. In this study, we assessed transcriptional profiles of equine skeletal muscle following 3 min of high-intensity exercise (at the speed eliciting their maximal oxygen uptake) in cool [wet bulb globe temperature (WBGT) 15°C] or hot (WBGT 30°C) conditions. Differential gene expression was identified using DESeq2 (false discovery rate cutoff: 0.05, minimal fold change: 1.5). At 4 h after exercise, RNA-seq identified 176 and 156 genes that were differentially...
Towards Consensus: A Pilot Study in Enhancing Recognition of Equine Affective States with RaiSE (Recognizing Affective States in Equine). The welfare of horses depends on the ability of their caretakers to accurately recognize and interpret their affective states. This study evaluates the effectiveness of RAiSE (Recognizing Affective States in Equine), an online educational course designed to enhance horse industry participants' skills in identifying equine emotions. The course content was developed using the Theory of Planned Behavior. The study involved 45 participants who completed pre- and post-surveys assessing their ability to interpret affective states from 20 video clips of horses. Results of the study showed that partic...
Circulating ACTH and Cortisol Investigations in Standardbred Racehorses Under Training and Racing Sessions. The hypothalamic-pituitary-adrenal (HPA) axis is a neuroendocrine system involved in the coping response to stressful challenges during exercise stimuli. Exercise represents a significant disruptor of homeostasis, inducing an ACTH-cortisol co-secretion, based on different characteristics of exercise in sport horses. Based on this statement, the aim of this study is to evaluate the circulating adrenocorticotropin and cortisol changes in Standardbred trotters, after training and racing sessions, considering the different age and sex. In particular, the aim is to determine to what extent the leve...
Preliminary Study on the Genetic Structure and Functional Candidate Genes of Grassland-Thoroughbreds Based on Whole-Genome Resequencing. Speed and endurance are the primary goals in racehorse breeding. The Grassland-Thoroughbred is a newly developed breed in northern China that combines speed, endurance, and environmental adaptability. However, current research on the genetic background of this breed and the genes associated with athletic performance remains limited. We conducted whole-genome resequencing on Mongolian (MG), Thoroughbred (TB), Xilingol (XL), and Grassland-Thoroughbred (CY) horses, generating 3813.74 Gb of clean data after quality control. The number of transitions was significantly higher than that of transversi...
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