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Deep digital flexor tenotomy provides pain relief and clinical comfort in horses with chronic laminitis. This study evaluated the clinical application, outcomes, and prognostic indicators of deep digital flexor tenotomy (DDFT) in horses with chronic laminitis. Unassigned: A computer-generated search identified all possible cases of laminitis for horses referred to the George D. Widener Hospital for Large Animals at the University of Pennsylvania between 2010 and 2022. Medical records were reviewed for a diagnosis of laminitis by clinical examination and radiographs. The population was characterized by breed, age, clinical features, and radiographic findings. Poisson regression was performed to id...
Delphi consensus on Thoroughbred yearling sales endoscopy in Australasia. Concerns regarding the reliability and consistency of yearling sales endoscopy in Australia and New Zealand have led to reduced industry confidence. Recent studies have clarified the relationship between yearling laryngeal function (YLF) grades and future outcomes. Objective: To build expert consensus on the most appropriate method for grading YLF, assess the clinical relevance of each grade on future race performance and prosthetic laryngoplasty risk, and develop guidelines for pre-sale endoscopic technique. Methods: Modified Delphi study. Methods: Anonymous, iterative surveys were distribute...
Microbiome analysis reveals the positive effects of exercise on the gut microbiota in horse. Gut microbiota is vital to host health, involving many aspects including immunity, metabolism and digestion. Exercise is recognized as a significant factor influencing the gut microbiota. However, the effects of exercise on the gut microbiota in horses remain unclear. Here, this study aims to investigate the effects of exercise on the gut bacterial and fungal communities in the horses using 16S rDNA and ITS genes amplicon sequencing. Results indicated that exercise significantly increased the ACE, Chao1 and Shannon indices of the gut bacterial community, accompanied by significant alterations ...
Evidence of occipitoatlantoaxial malformations independent of the HOXD3 mutation in an Arabian horse. Occipitoatlantoaxial malformations (OAAM) are developmental disorders occurring at the occiput, atlas and axis. OAAM type 1 is a familial disorder affecting Arabian horses. Currently, a single genetic mutation in the HOXD3 gene region can be tested to confirm the diagnosis. This case describes a 3-year-old Arabian gelding affected with OAAM. Clinical examination revealed a proximal cervical deformation on the right side and severe stiffness of the neck in the sagittal plane without associated pain. Neurological examination demonstrated a generalized proprioceptive ataxia. Radiographs revealed ...
HERDA-associated variant in bull-catching (vaquejada) Brazilian Northeastern bull-catching Quarter Horses. Bull-catching (vaquejada) accounting for approximately 13% of sport horses in Brazil. Genetic screening has enabled strategies to reduce the spread of inherited disorders, including Hereditary Equine Regional Dermal Asthenia (HERDA), a major skin disease included in the Six Panel required for registration by the Brazilian Quarter Horse Breeders Association. Although the HERDA-associated variant has been extensively studied in other disciplines, it had not been evaluated in Bull-catching Quarter Horses (QH). Objective: The present study aimed to determine the allele frequency of the pathogenic ...
Comprehensive molecular characterization of Theileria equi: Detection, genetic diversity, and risk factors assessment. Equine piroplasmosis, caused by Theileria equi, has been widely studied globally, but genetic diversity research in India remains limited. Analysis of 306 horse blood samples revealed T. equi infection in 10.78% by microscopy and 21.24% by PCR. Universal primers targeting 18S rRNA of T. equi and Babesia caballi were used, followed by species-specific primers generating 435 bp amplicons. Sequenced PCR-positive samples revealed high homology (99.52-100% in India, 95.89-100% globally), with all Indian isolates classified as genotype A. The EMA-1 gene phylogenetic analysis confirmed the insights f...
Survey of equine pasture best management practices and soil fertility in southeast Pennsylvania after the grazing season. Proper pasture management improves forage yield, reduces costs, and minimizes environmental impacts, but may be difficult in suburban settings. Objective: This study evaluated pasture condition and management practices on 28 horse farms in counties adjacent to the Philadelphia metropolitan area. Methods: Between November 2019 and January 2020, 72 pastures (2-3/farm) were assessed via soil sampling, USDA-NRCS Pasture Condition Score Sheet (PCSS), Penn State Equine Pasture Evaluation Disc (EPED), and farm manager interviews. Linear models assessed effects of management factors on pasture conditi...
Evaluating Protein Enrichment Methods to Improve Biomarker Discovery in Equine Cerebrospinal Fluid. Cerebrospinal fluid (CSF) is a valuable source of biomarkers for neurological diseases, but detection of low-abundance proteins is often masked by highly abundant proteins. Enrichment strategies can enhance proteomic coverage and improve biomarker discovery, yet comparative evaluations of such methods in equine CSF are limited. Objective: This study compared the ProteoMiner Small-Capacity Enrichment Kit and the PreOmics Enrich-iST Kit for their ability to deplete high-abundance proteins and enhance detection of low-abundance proteins relevant to neuropathology. Methods: Equine CSF samples were...
Haplotype GWAS in swedish warmblood horses for conformation and jumping traits. The aim of this study was to better understand the genomic architecture behind performance-related traits in sport horses. In this study, we conducted a haplotype-based genome-wide association study (GWAS) for 36 conformation and free jumping phenotypes recorded during routinely conducted young horse evaluation tests involving 380 Swedish Warmblood (SWB) horses. The horses were evaluated by expert judges using both traditional and linear evaluation systems. All samples were genotyped using the 670K Affymetrix® Axiom® Equine Genotyping Array, haplotypes were first phased, and haplotype blocks...
Evaluation and Management of the Horse with Head and Neck Disorders. Recognizing possible causes of equine head and neck problems requires a careful and systematic evaluation. While for some disorders reaching a diagnosis and treatment plan is relatively straightforward, for others this can be a complicated road requiring extensive diagnostic techniques, treatment trials, and management strategies. The ability to determine whether the patient is in a painful state, experiencing functional deficits, or in a combination of pain and dysfunction is critical to developing an effective treatment plan. Frequently, behavioral concerns often associated with pain must be...
Atropine induces narrowing of the superior and inferior iridocorneal angle and ciliary cleft in normal horse eyes. To investigate the effects of atropine on the iridocorneal angle (ICA) and ciliary cleft (CC) of normal equine eyes using ultrasound biomicroscopy (UBM). Unassigned: 12 normal adult horses underwent measurement of intraocular pressure (IOP), vertical and horizontal pupil diameter, and UBM of the superior, temporal, inferior, and nasal ICA/CC in both eyes. Measurements were repeated 2 hours following ophthalmic atropine 1% solution application. Measurements of the ICA and CC, including pectinate ligament distance (PLD), CC length (CCL), height of opening distance (HOD), CC area (CCA), and pecti...
Learning in the arena: healthcare students’ lived experience of interprofessional education in equine-assisted services. This qualitative study explored healthcare students' lived experiences during an interprofessional education (IPE) event incorporating equine-assisted services (EAS). Traditional IPE events often rely on classroom settings that may limit interprofessional engagement, collaboration, and application. Utilizing interpretive phenomenological analysis, researchers examined how the equine environment influenced interprofessional learning among fourteen graduate students from diverse healthcare disciplines at a western United States public university. Participants engaged in experiential demonstratio...
Milk fat globule EGF and factor V/VIII domain containing (MFGE8) as a novel player in equine endometrial fibrosis. With increasing age, mares are frequently affected by endometrial fibrosis. Transforming growth factor beta 1 (TGF-β1) promotes fibrosis, while milk fat globule EGF and factor V/VIII domain containing (MFGE8) primarily exerts antifibrotic effects. We used in situ hybridization analysis (ISH) to investigate MFGE8, TGFB1 and its downstream effectors cellular communication network factor 2 (CCN2) and transgelin (TAGLN) in equine endometrial fibrosis. Additionally, transcriptional effects of TGF-β1 and MFGE8 on equine endometrial fibroblasts in vitro were investigated by single cell sequencing. ...
Molecular typing, biofilm characteristics and biofilm-targeted inhibition strategies of Streptococcus equi subsp. zooepidemicus isolated from donkey endometritis. Endometritis is a major cause of infertility in intensively farmed donkeys. Streptococcus equi subsp. zooepidemicus (SEZ) is a predominant pathogen that readily forms biofilms in equine endometritis, conferring resistance to conventional treatments. Objective: This study aimed to characterize the biofilm dynamics of SEZ isolates obtained from donkeys and to evaluate potential anti-biofilm strategies with different drug combinations. Methods: Uterine lavage samples were collected from 30 Dezhou Black donkeys with clinical endometritis. Bacterial cultures were performed on blood agar and MacConk...
Objective gait analysis methods for assessing movement asymmetry in the equine patient. To demonstrate the uses, data interpretation, and limitations of objective gait analysis methods in equine practice. Unassigned: Teaching and client-owned horses. Unassigned: Informed owner consent was obtained for all animals used in the making of this technical tutorial video. Primary literature relevant to this video was reviewed from January 2016 to January 2026. Images and data were collected from teaching horses and client-owned horses. Unassigned: Objective gait analysis provides accurate and repeatable data on the locomotion of a horse; however, inaccuracies may occur, especially in ca...
Behavioral and cardiorespiratory effects of a medetomidine and tramadol combination in horses. The use of combinations of sedative and analgesic drugs during standing procedures in horses is necessary to provide reliable sedation with minimal ataxia and reduced responses to surgical or other stimuli in horses. Objective: This study assessed the behavioral and cardiorespiratory effects of medetomidine (M) administered with and without tramadol (T) in horses. Methods: Eight horses were sedated intravenously with M (5 µg/kg) alone or with T (2 mg/kg) in a arandomized, blind, two-way crossover trial. Behavioral responses, including head height above the ground (HHAG), postural instability ...
Diagnostic Threshold Identification for Equine Laminitis Using Smoothed Receiver Operating Characteristic Analysis. Radiographic measurement parameters play a key role in diagnosing acute and subacute laminitis in horses, with diagnostic thresholds typically derived from empirical receiver operating characteristic (ROC) analysis. However, these methods often produce unstable results, particularly in small or noisy datasets. This study applies nonuniform rational B-spline (NURBS)-based ROC smoothing to radiographic data from laminitic and healthy horses to evaluate its effectiveness in refining diagnostic thresholds. Thresholds are determined using Youden's index based on NURBS-smoothed ROC curves and compar...
Effect of season of collection and storage method on equine hair cortisol concentration. Serum cortisol concentration is one of the common physiological reference standards for evaluating stress in animals. However, it only evaluates acute stress at the moment of blood collection. Hair cortisol concentrations (HCC) could provide a method for assessing cortisol concentrations over extended periods of time, giving an estimate of chronic stress levels. In this case, high HCC results could help equine managers alter management practices to improve welfare. Objective: To evaluate the effect of the month of collection and the storage method on equine HCC. Methods: Tail hair was collecte...
A single pneumatic tourniquet is superior to wide rubber tourniquets for saphenous intravenous regional limb perfusion with amikacin in standing, sedated horses. To establish whether tourniquet type and number influence synovial fluid amikacin concentrations of the tarsocrural joint (TCJ) or metatarsophalangeal joint (MTPJ) after standing saphenous IV regional limb perfusion (IVRLP) with 2 g of amikacin. Unassigned: 8 healthy adult horses underwent 4 saphenous IVRLP protocols with amikacin, differing in tourniquet type (pneumatic vs wide rubber) and number (1 placed mid-gaskin vs 1 placed mid-gaskin and 1 mid-metatarsus) in a randomized, crossover design. Amikacin concentrations were measured in serum and synovial fluid of the TCJ and MTPJ at 15 and 30...
Successful Use of Vincristine in a Quarter Horse Gelding with Immune-Mediated Thrombocytopenia. This case reports the successful use of vincristine in a Quarter Horse with presumed immune-mediated thrombocytopenia. A 15-year-old Quarter Horse gelding presented for a pinch skin graft procedure on the left forelimb over the cannon bone. On day 10 of hospitalization, the horse developed a fever (102.6°F, RI: 99-101°F), and severe petechiae of the mucous membranes. A complete blood count (CBC) (Advia 2120i) revealed a severe thrombocytopenia (16,000 platelets/μL, RI:100,000-400,000/μL). Diagnostic testing was negative for Anaplasma phagocytophilum by PCR, Theileria equi and Babesia cabal...
Hematological and Biochemical Profiles in Mule and Horse Neonates from Birth to 30 Days of Age: A Comparative Study with Clinical Perspectives. Few studies have evaluated hematological and biochemical parameters in mule foals, and neonatal reference data remain limited. Objective: To compare hematological and biochemical parameters in mule and horse neonates up to 30 days of life. Methods: Mule (n=15) and horse (n=16) neonates were evaluated at birth, 12 and 24h, and at 7 and 30d of age. Results: Mules had higher mean corpuscular hemoglobin concentration (g/dL; 33.85 ± 0.18; P=0.04), platelets (× 10³/µL; 342,179 ± 15,691; P=0.0051), albumin (g/dL; 3.24 ± 0.05; P=0.0039), calcium (mg/dL; 12.27 ± 0.14; P=0.03), chloride (mmol/L; ...
Prevotella mikamonis sp. nov., isolated from equine clinical specimens. In this study, five strains of anaerobic, Gram-negative, rod-shaped bacteria were characterized phenotypically, biochemically and genotypically. These strains were clinically isolated from horse specimens in Japan. Phylogenetic trees constructed based on 16S rRNA gene sequence comparisons showed distinct clustering of the five strains with the type strains of closely related species. The genomic DNA G+C content was 46.7 mol%. The major cellular fatty acids identified were C, 3-OH-C and 3-OH-iso-C. Whole-genome comparisons based on average nucleotide identity using blast (ANIb) and digital DNA...
Adrenocorticotropic Hormone and Thyroxine Concentrations in Young Healthy Equids: Species Differences and Seasonal Variations. Due to growing interest in endocrine diseases, more studies aim to interpret the baseline concentrations and reference intervals of hormone values like adrenocorticotropic hormone (ACTH) and thyroxine (T4) in horses. Most studies available in the literature focus on evaluating ACTH and thyroid hormone values in adult and geriatric horses, with only a few considering younger donkeys and ponies. This study aimed to measure ACTH and T4 in autumn and spring in younger equids. The study included 42 young equids, which were divided into three groups: horses, ponies, and donkeys. The concentration of...
Mucosal T cell activation pathways are upregulated by equine herpesvirus type 1 infection. Equine herpesvirus type 1 (EHV-1) is a high morbidity and mortality virus that impacts horse populations worldwide. As a respiratory virus, it enters through the upper respiratory tract (URT), where mucosal immunity plays a crucial role in preventing severe disease. In this study, flow cytometry was used to characterize the nasal leukocyte population during EHV-1 infection, and RNA sequencing of nasal secretions was employed to assess transcriptional markers of the mucosal immune response. Horses with distinct immune statuses were compared at four stages: pre-infection, early (day 1 and 3 post...
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