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Trendelenburg positioning with or without norepinephrine infusion for haemodynamic support in anaesthetised hypovolemic horses.
Equine veterinary journal    April 19, 2026   doi: 10.1002/evj.70169
Paranjape VV, Hopster K, Lutvikadic I, Driessen B.Intraoperative haemorrhage during equine anaesthesia is a rare but potentially fatal complication requiring prompt haemodynamic support. Postural manoeuvres such as Trendelenburg (TL) positioning and vasopressor support augment venous return and improve cardiac output (CO), yet their efficacy in anaesthetised hypovolemic horses remains unstudied. Objective: To evaluate haemodynamic effects of TL positioning during normovolemia and acute haemorrhagic hypovolemia, and to determine whether concurrent norepinephrine (NE) infusion enhances cardiovascular stabilisation. Methods: In vivo experiments....
Exploring the relationship between inhibitory control and coping behaviour in horses.
Scientific reports    April 18, 2026   Volume 16, Issue 1 12738 doi: 10.1038/s41598-026-48050-z
von der Tann M, Palme R, König von Borstel U, Brucks D.The ability to flexibly adapt to the demands of a stressful situation is a key factor in successful coping. Appropriate coping is of critical importance in artificial environments, which may include novel and potentially stressful situations. Being able to inhibit immediate but counterproductive reactions, and thus exert inhibitory control, might allow to better adapt to the environment. Horses are required to flexibly adapt to various housing conditions and training techniques; however, not all horses successfully cope as evidenced by the prevalence of stereotypical behaviours. We tested 31 m...
Standing computed tomographic tenography is reliable in identifying soft tissue lesions within the digital flexor tendon sheath in horses.
Veterinary surgery : VS    April 17, 2026   doi: 10.1111/vsu.70110
Aßmann AD, Suàrez Sànchez-Andrade J, Bischofberger AS.To determine the diagnostic performance of standing computed tomographic tenography (CTT) in detecting naturally occurring intrathecal lesions of the superficial digital flexor tendon (SDFT), deep digital flexor tendon (DDFT), manica flexoria (MF), and in identifying palmar/plantar annular ligament (PAL) desmitis and constriction in horses undergoing tenoscopy. Methods: Retrospective observational study. Methods: Client-owned horses of various breeds and use, median age of 12.5 years (range: 6-20 years). Methods: A total of 24 horses with inconclusive ultrasonographic and contrast tenograp...
Efficacy of an Oral Chondroprotective Joint Supplement on Stride Length and Gait Symmetry in Aged Geldings with Chronic Lameness.
Animals : an open access journal from MDPI    April 17, 2026   Volume 16, Issue 8 1230 doi: 10.3390/ani16081230
Harbowy RM, Robison CI, Tillman I, Manfredi JM, Nielsen BD.Oral joint supplements (OJSs), specifically those containing glucosamine and chondroitin sulfate, are some of the most popular feed additives fed by horse owners. However, evidence of the efficacy of these nutraceuticals in vivo is lacking. To investigate the impacts of an OJS on equine lameness, 40 geldings (18 ± 7 yr) with chronic lameness and AAEP lameness grades between 2 and 4 (as scored by a veterinary sports medicine and rehabilitation specialist) were enrolled in the study. Horses were stratified by lameness grade, BCS, and weight, and then randomly assigned to receive a placebo powde...
Klossiella equi, an underreported parasite of equids in the Americas.
Veterinary parasitology    April 17, 2026   Volume 345 110781 doi: 10.1016/j.vetpar.2026.110781
Zeldenrust EG, Carlton K, Jenkins EJ, Moré G, Nielsen MK, Pearl DL, Schott CR, Terier SM, Barta JR.Klossiella equi Baumann, 1946 (Apicomplexa: Coccidia) is a globally distributed adeleorinid parasite that infects the kidneys of equid hosts. Considered an uncommon parasite, when K. equi is detected, it is typically an incidental finding during histologic examination of the kidneys as part of routine necropsy. In the present study, kidney was collected opportunistically from 3 different equine populations: 1) routine necropsies at the Ontario Veterinary College (OVC; n = 48); 2) natural mortalities from the Sable Island wild horse herd (n = 25); and 3) routine necropsies of animals fr...
Toll-like receptor 3-activated allogeneic umbilical cord blood-derived mesenchymal stromal cells as an adjunct for the treatment of synovial sepsis in 3 horses.
Journal of the American Veterinary Medical Association    April 17, 2026   1-9 doi: 10.2460/javma.25.12.0821
Barton CK, Koch TG, Russell KA, Moorhead R, Mehrpouyan S, Alizadeh AH, Dow S, Pezzanite LM, Goodrich LR.To describe the case presentation, treatment, and outcome of horses treated with Toll-like receptor 3 (TLR-3)-activated allogeneic umbilical cord blood-derived mesenchymal stromal cells (CB-MSCs). Unassigned: 3 horses presenting with chronic or antimicrobial-resistant (AMR) septic synovitis. Unassigned: All horses presented with clinical signs associated with septic synovitis including marked grade 4/5 lameness, joint effusion, heat/swelling of the limb, and synovial fluid parameters consistent with sepsis. Case 1 presented 3 weeks following the onset of clinical signs. Cases 2 and 3 developed...
Abdominal palpation per rectum is highly sensitive for identifying small versus large intestinal lesions in horses presenting for colic.
Journal of the American Veterinary Medical Association    April 17, 2026   1-7 doi: 10.2460/javma.25.12.0837
Hallsten M, Fogle C, Shippy S, Hobbs KJ, Blikslager AT, Elane GL.To describe the sensitivity, specificity, predictive values, and accuracy of abdominal palpation per rectum in horses treated surgically for colic. Unassigned: Medical records were gathered over 5 years (2019 to 2024). Findings of abdominal palpation per rectum were collected and compared to surgical diagnosis, and cases were categorized as true or false positive and negative. Signalment, physical examination parameters, hematologic values, and years of examiner experience were recorded. Unassigned: Records of 453 horses were included. Overall sensitivity and positive predictive value were 86%...
Comparative Morphological and Proteomic Characterization of Adipose Tissues from Different Anatomical Sites in Yili Horses.
Biology    April 16, 2026   Volume 15, Issue 8 621 doi: 10.3390/biology15080621
Yang L, Song L, Lu Z, Yao X, Wang J, Zeng Y, Ren W, Luo P, Meng J.Adipose tissue functions not only as a primary energy reservoir but also as a metabolically active endocrine organ. However, the morphological and molecular differences among adipose depots from different anatomical sites in Yili horses remain unclear. This study aimed to compare the morphological characteristics and proteomic profiles of subcutaneous adipose tissue (SAT) and pericardial adipose tissue (PCAT). To this end, adipose tissue samples from 18 Yili horses were analyzed using hematoxylin and eosin (H&E) staining, while a subset of samples from 6 horses was subjected to proteomic a...
Erythrocyte sequestration of metformin in horses: impact on matrix-specific pharmacokinetics and detection windows.
BMC veterinary research    April 16, 2026   doi: 10.1186/s12917-026-05449-0
Jacobs ME, Blea J, Hardy M, McKemie DS, Traynham M, Knych HK.BACKGROUND: Metformin is used for the treatment of type 2 diabetes and is one of the most prescribed medications in human medicine. It is less commonly prescribed in equine medicine, and its use is tightly regulated in several performance horse disciplines. In horseracing, it is considered a banned substance. A previous pharmacokinetic study of metformin in horses demonstrated a prolonged, unpredictable elimination phase. In the current study it was hypothesized that this was due to sequestration of metformin in a “deep” compartment, specifically red blood cells. This could result in pharm...
Integrative Phosphoproteomic Profiling Reveals Stage-Specific Signalling and Metabolism in Equine Melanocytic Neoplasm.
Veterinary and comparative oncology    April 16, 2026   doi: 10.1111/vco.70070
Srimontri P, Kingkaw A, Prapaiwan N, Sujittosakul R, Iamkaewprasert N, Piputwat J, Isama-Al P, Munkongdee T, Chotikaprakal T, Yanyongsirikarn P....Equine melanocytic neoplasms (EMN) are aggressive tumours characterised by high metastatic potential and limited therapeutic options available. However, the molecular mechanisms underlying their progression remain poorly understood. This study therefore presents the integrative phosphoproteomic analysis of EMN tissue, with the aim of elucidating stage-specific alterations in signalling pathways and metabolism. Nineteen tissue samples from grey horses were categorised as normal-stage (n = 6), early-stage EMN (n = 7), and severe-stage EMN (n = 6) and subjected to in-depth analysis us...
Transcriptome Sequencing and Differential Analysis of Testes in One- and Two-Year-Old Kazakh Horses.
Animals : an open access journal from MDPI    April 16, 2026   Volume 16, Issue 8 1220 doi: 10.3390/ani16081220
Su Y, Wen L, Jiang J, Wen M, Zeng Y, Meng J, Wang J, Ren W, Yao X.This study systematically elucidated the developmental characteristics and molecular regulatory mechanisms of the testis during the critical period of sexual maturation in Kazakh horses by combining histological observation of one- and two-year-old testicular tissues with transcriptomic sequencing. In the testes of one-year-old horses, no obvious lumen was observed, and the interior is mainly comprising supporting cells and spermatogonia on the basement membrane; in contrast, in the testes of two-year-old horses, the tubular lumen was complete with spermatogonia, spermatocytes, and spermatozoa...
Multivalent Disabled Infectious Single Animal (DISA)-DIVA vaccine for all nine serotypes of African horse sickness virus (AHSV) is broadly protective in IFNAR (-/-) mice.
Veterinary research    April 16, 2026   doi: 10.1186/s13567-026-01753-7
Utrilla-Trigo S, Jiménez-Cabello L, van Gennip RGP, van Rijn PA, Ortego J, Calvo-Pinilla E.African horse sickness (AHS) is a highly severe, midge-borne disease of equids showing a mortality rate of > 90% in naive domestic horses. Outbreaks are caused by AHS virus (AHSV) and result in devastating economic losses in developing countries as equids play a crucial role in the agricultural industry and many households. The AHSV species encompasses nine serotypes showing no or limited cross protection, which is challenging regarding AHS vaccine development. Recently, and like bluetongue virus (BTV), the AHS Disabled Infectious Single Animal (DISA)-DIVA vaccine platform was developed...
Antibacterial use in Norwegian horses: a nationwide registry-based cross-sectional study.
BMC veterinary research    April 16, 2026   doi: 10.1186/s12917-026-05474-z
Löfling LL, Haadem CS, Reiersen A, Börjesson S, Helgesen KO.BACKGROUND: Antibacterials are essential for treating infections in horses, but the use contributes to antimicrobial resistance (AMR), which threatens animal and human health. Despite these concerns, antibacterial use in horses has not been systematically studied and described in Norway, and nationwide registry-based analyses in other countries are scarce. The aim of this study is to describe antibacterial use in Norwegian horses, 2022–2024, by analysing nationwide registry data, with a particular emphasis on gynecological and obstetrical conditions. In addition, we will evaluate the data qu...
Interleukins decrease epithelial protein and gene expression by K14 + CD105+ equine hoof progenitor cells.
Stem cell research & therapy    April 15, 2026   doi: 10.1186/s13287-026-05013-5
Yang Q, Lopez MJ.Background: Progenitor cell epithelial to mesenchymal transition (EMT) could impact healing in the epidermal-dermal junction of the equine hoof stratum internum (SI). The hypothesis of this study was that K14 + CD105+ equine hoof SI progenitor cells assume a mesenchymal phenotype in the presence of inflammatory interleukins in vitro.Methods: K14 + CD105+ progenitor cell percentages isolated from proliferative scarred (fibrous) and healthy SI were quantified. Decellularized matrix was prepared from and K14 + CD105+ cells localized in healthy SI. Gene expression (CD44, CD105, E-cadhe...
Deep digital flexor tenotomy provides pain relief and clinical comfort in horses with chronic laminitis.
Journal of the American Veterinary Medical Association    April 15, 2026   1-6 doi: 10.2460/javma.25.12.0839
Orsini JA, Stefanovski D.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...
Persistence of Sarcocystis neurona and histopathology in horses with equine protozoal myeloencephalitis.
Frontiers in veterinary science    April 15, 2026   Volume 13 1787994 doi: 10.3389/fvets.2026.1787994
Helber L, Wagner B, Leeth CM, LeRoith T, Cecere TE, Lahmers KK, Andrews FM, Hay AN, Werre SR, Johnson AL, Clark CK, Pusterla N, Reed SM, Lindsay DS....Currently, little is known about the exact role of immunopathology in equine protozoal myeloencephalitis (EPM), including the ability to persist after anti-protozoal treatment. The main objectives of this study were to determine whether is present in the CNS in horses with EPM, including previously treated cases, and to evaluate the associated histopathology and immune response. For this study, control ( = 10) and horses with EPM ( = 9) were confirmed based on our inclusion criteria. Based on our preliminary data, we classified horses with EPM and clinical signs for >6 months as...
Influence of riders’ physical activity on improving seat balance in the context of horse welfare – A pilot study.
PloS one    April 15, 2026   Volume 21, Issue 4 e0344969 doi: 10.1371/journal.pone.0344969
Zeliszewska-Duk P, Skowerska-Wiśniewska A, Wilk I, Nowicka B, Duk M, Strzelec K.This study aimed to investigate the impact of gym exercises for riders on their posture and the subsequent effect on reducing discomfort for their horses during training, using electronic pressure sensors. The study involved 20 warmblood horses aged 5-10 years, regularly ridden under saddle, and four riders of similar height and body weight. The study group was divided into a control group (10 horses) and an experimental group (10 horses). The horses were trained 5 days a week for 60 days in total. Riders trained three times a week for approximately 60 minutes. The exercises were designed to i...
Exploratory evaluation of equine placental extract supplementation on ageing indicators in geriatric dogs: a single-arm pre-post study.
BMC veterinary research    April 15, 2026   Volume 22, Issue 1 311 doi: 10.1186/s12917-026-05475-y
Morita N, Hirano E.BACKGROUND: Recent advances in preventive veterinary healthcare, nutritional management, and owner engagement have extended the longevity of domestic dogs. However, this increased lifespan has led to a higher prevalence of age-associated physiological and functional decline. Equine placental extract contains a variety of bioactive constituents, with reported antioxidative and anti-inflammatory properties. Although the use of equine placental extract in veterinary practice is expanding, empirical evidence supporting its effects on ageing-related clinical outcomes in dogs remains limited. In thi...
Presurgical acetone and chlorhexidine aseptic preparation of the equine hoof lowers bacterial counts below surgically acceptable threshold.
Journal of the American Veterinary Medical Association    April 15, 2026   Volume 264, Issue 9 1-8 doi: 10.2460/javma.25.12.0822
Gonzalez GA, O'Shea CM, Nabors B, Eldridge J, Wills R, Stilwell N.The objectives were to determine whether topical applications of acetone and 4% chlorhexidine following removal of the superficial hoof wall reduces tissue bacterial load below 5 log10 microorganisms per gram (CFUs/g) of tissue and whether Dey-Engley neutralizing broth (DENB) neutralizes residual chlorhexidine in vitro within equine hoof tissue samples. Unassigned: In a clinical prospective study with a total of 24 hooves, the superficial hoof was mechanically removed followed by disinfection with acetone and 5-minute rough and aseptic preparations with 4% chlorhexidine. Dorsal wall, frog, and...
Age-Associated Differences in Paddock Locomotor Activity Among Senior Horses: A Pilot Observational Study.
Animals : an open access journal from MDPI    April 15, 2026   Volume 16, Issue 8 1208 doi: 10.3390/ani16081208
Poinsard L, Anson C, Billat V.Turnout locomotor activity is a potentially informative indicator of health and welfare in older horses, yet objective field data in seniors remain limited. We examined whether a brief turnout recording could detect cross-sectional associations between chronological age and locomotor activity in senior horses in this study setting. In this single-site observational study, 28 senior Selle Français horses (17-35 years) contributed 122 paddock sessions (2 h each), with total distance and mean speed quantified using a Polar Team Pro sensor. Associations with age were assessed using linear mixed-e...
Overview of the Current Osteoarthritis Treatment in Veterinary Medicine and Future Directions.
ACS pharmacology & translational science    April 14, 2026   Volume 9, Issue 5 1037-1054 doi: 10.1021/acsptsci.5c00706
Quintão NLM, Moffa EB, Kroier M, Goldoni RC, Bundgaard L, Jensen AL, Fernandes ES.Osteoarthritis (OA) is a chronic and progressive joint disease that can cause permanent loss of joint function. OA is highly prevalent in horses, dogs, and cats, affecting different joints and leading to reduced mobility and chronic pain. Different risk factors for animal OA have been identified, including trauma and breed. Inflammation is a hallmark of the disease, with various underlying mechanisms such as cyclooxygenase and metalloproteinase activation, nerve growth factor, cytokine, and prostaglandin upregulation, among others. Although disease complexity makes OA difficult to treat, eno...
Morphometric Characterization and Preliminary Heritability Estimates of Body Measurements in the Polish Konik Populations.
Animals : an open access journal from MDPI    April 14, 2026   Volume 16, Issue 8 1190 doi: 10.3390/ani16081190
Pasicka E, Sobek Z, Wierzbicki H, Różańska-Zawieja J, Nienartowicz-Zdrojewska A.The objective of this paper is to demonstrate the morphometric diversity of 172 Polish Koniks from the largest Polish breeding centers and to assess their genetic diversity by estimating the effective population size () and heritabilities () of the studied traits. The animals were bred under a stable housing system. Horses of both sexes aged 3 to 24 years were analyzed. Each horse was characterized with 40 metric traits. Multifactorial analyses (PCA, DA) and the REML method were applied to reveal the exterior differentiation and the development of distinct morphometric types. The findings esta...
Delphi consensus on Thoroughbred yearling sales endoscopy in Australasia.
Equine veterinary journal    April 14, 2026   doi: 10.1002/evj.70164
Hardwick JL, Ahern BJ, Anderson BH, Franklin SH.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...
Relationship between the estrus duration in cyclic mares and the endometrial gene expression on day 7 post-ovulation.
Veterinary research communications    April 13, 2026   Volume 50, Issue 4 265 doi: 10.1007/s11259-026-11213-4
Sala-Ayala L, Silva ES, Borges LD, Barbosa LA, Martínez-Boví R, Maran AP, Cuervo-Arango J.This study investigated the effect of estrus duration on endometrial gene expression in cyclic mares on Day 7 post-ovulation, focusing on transcripts relevant to early pregnancy: uterocalin (P19), insulin-like growth factor 1 (IGF1), fibroblast growth factor 2 (FGF2), progesterone receptor (PGR), and estrogen receptor alpha (ESR1). Twelve mares were classified according to the estrus duration in long estrus (LE, ≥ 3 days of endometrial edema; n = 7) or short estrus (SE,  0.1). ESR1 expression was undetectable in all samples. These findings suggest that prolonged estrus enhances P19 e...
Microbiome analysis reveals the positive effects of exercise on the gut microbiota in horse.
Microbial pathogenesis    April 13, 2026   108501 doi: 10.1016/j.micpath.2026.108501
Ma R, Wang C.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 ...
Money, morality, and nationalism: the contested sponsorship of the Falsterbo horse show.
Frontiers in sports and active living    April 13, 2026   Volume 8 1741781 doi: 10.3389/fspor.2026.1741781
Karlsson J.In early 2025, the Falsterbo Horse Show entered a title sponsorship agreement with Al Shira'aa Stables in the United Arab Emirates, prompting extensive Swedish media coverage and strong public reactions. This controversy offers an opportunity to examine how sport sponsorship becomes a site for moral and geopolitical boundary-making. Drawing on a Foucauldian understanding of discourse as a meaning-making practice, the study analyses 210 Swedish newspaper articles published between February and April 2025 to explore how power/knowledge operates through language and how sponsorship is discursivel...
Evidence of occipitoatlantoaxial malformations independent of the HOXD3 mutation in an Arabian horse.
Journal of equine veterinary science    April 12, 2026   105894 doi: 10.1016/j.jevs.2026.105894
Vanderbiest L, Rousseau L, Renaville B, Aleman M, Finno C, Milan A, Vinardell T.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 ...
Terpenic compounds possess anthelmintic and immunomodulatory properties with potential for controlling equine cyathostomin infections.
International journal for parasitology. Drugs and drug resistance    April 12, 2026   Volume 31 100642 doi: 10.1016/j.ijpddr.2026.100642
Malsa J, Chereau A, Guégnard F, Serreau D, Gesbert A, Reigner F, Chamoin L, Guillot J, Vernudachi A, Mach N, Fleurance G, Lacroix-Lamandé S....The emergence of anthelmintic-resistant parasite isolates necessitates alternative control strategies. The use of dietary additives with anti-parasitic or immunomodulatory activities has been proposed as a solution, but whether such additives can simultaneously exert dual bioactivities within this context has rarely been explored. Here, we evaluated whether selected terpenes could exert dual bioactivities (anti-parasitic and immunomodulatory) with a view to their use as food additives that can limit strongyle infections in horses. In vitro tests with cyathostomin larval development, larval mig...
Genetic diversity in the Criollo Argentino horse from SNP array data.
Genetica    April 11, 2026   Volume 154, Issue 1 16 doi: 10.1007/s10709-026-00266-7
The Criollo Argentino horse is a national symbol and a heritage breed that represents both cultural identity and a key component of traditional production systems in Argentina. This study aimed to assess the genetic differentiation of the Criollo Argentino relative to other horse breeds and to infer potential factors shaping its diversity through the genomic analysis of 24 representative animals. Samples were genotyped using a medium-density SNP array containing 65,157 markers, and genetic diversity analyses were conducted across autosomal SNP sets filtered under different criteria. Contempora...
Comprehensive molecular characterization of Theileria equi: Detection, genetic diversity, and risk factors assessment.
Experimental parasitology    April 11, 2026   109135 doi: 10.1016/j.exppara.2026.109135
Maharana BR, Ganguly A, Malik R, Kumar A, Khanna S, Kumar B, Potliya S, Singh H, Dash A, Sahu S.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...