Ontario Animal Health Network (OAHN)
Equine Expert Network
Quarterly Veterinary Report

Strangles Resources


OAHN Research Project: Selenium blood concentration in Ontario broodmares and foals

We need your help! As you know, the soil in Southern Ontario is selenium deficient leading to several conditions in domestic animals. White muscle disease in the best-known condition, but did you known that 96% of foals with low blood selenium concentrations display signs of dysphagia or weak suckle reflex due to pharyngeal/masticatory muscle weakness?

We believe that selenium deficiency is underdiagnosed in Ontario foals, therefore, the OAHN equine network wants to study Se levels in the blood of broodmares and their foals at parturition. This is where you come in. Participating veterinarians will collect serum from mares and foals, as well as colostrum, within 24 hours of foaling. Selenium and vitamin E concentrations will be measured. We will provide sampling kits (blood tubes, needles, containers etc.) and cover the costs of shipping and analysis. We will also be asking you to have the broodmare owner/manager fill out a short questionnaire.

If you are interested in participating in this exciting project, please contact Dr. Arroyo (Memo) at larroyo@uoguelph.ca.

Network Member Reports

Southwestern Region

(Melissa McKee)

This was a quiet quarter for Potomac Horse Fever/oxytetracycline responsive disease in our area. Our clinic vaccinated for PHF more than usual this year. Vaccine reactions in general were slightly decreased. Compared to last year and previous quarter, fewer barns were diagnosed with Strangles. There has been a fair amount of rainy weather associated with an increase in fungal skin conditions. Fulvicin is off the market as have medicated shampoos making treatment more challenging.  There was an uptick in asthma associated with the wildfires, odd medical colics, and one interesting case in a middle age reining cow horse, that, 3 weeks prior developed swelling in the LH which looked like cellulitis. He was treated at home by his RVT owner. When the swelling decreased, he developed a LH toe drag. No pain, full range of motion, and could bear weight on LH while RH was picked up. On the lunge he would drag LH; peroneus tertius was intact but left gluteal was completely flaccid, Laboratory results were normal. Acupuncture evaluation revealed no superficial pain sensation on vasus lateralis, mild deep pain sensation over the gluteal muscles and sensitivity over the hamstrings. Differential diagnoses included EPM or traumatic injury to L6-S1 nerve roots. On supportive treatments.
Western Region

(Tara Foy)

This quarter, we had the typical respiratory outbreaks in foals (Bordatella bronchiseptica and negative for all tested viruses). We had two neuro cases a couple of weeks ago which died and came back negative for the usual suspects on PCR testing. We’ve also had a Strangles outbreak, lots of colics and asthma cases. We have seen a number of colicky horses that act like they are going to break with diarrhea but don’t and within 3-4 days of supportive treatment they recover.

We went through a phase years ago when we saw a number of horses with equine proliferative enteropathy (EPE – Lawsonia intracellularis) but it has been silent for the last 5 or 6 years. The last horses I diagnosed were warmbloods on a small breeding operation.

Eastern Ontario

(John Donovan)

 Nothing to report.
Ontario Veterinary College

(Memo Arroyo)

We admitted a number of colics this quarter. EPE (Lawsonia intracellularis) was diagnosed in some older horses (16-18 month old) that have arrive with significant hypoproteinemia, thickening of the small intestine and sometimes colon and loose manure but don’t break with diarrhea. We continue to admit horses with high fevers and thickened colon on ultrasound examination. We have been unable to find an etiologic agent. We have had some horses with cellulitis admitted but are unsure of the inciting cause. They respond variably.  This has been a very busy quarter for Potomac Horse Season with higher numbers of positive horses than in recent years (40 cases).
AHL Pathology

(Emily Ratsep)

  • 8 year old Belgian mare with presumptive aortic rupture with acute hemoabdomen. Owner checked mare at 6 am, no concerns noted at that time. Came out to barn again at 8 am and found the mare dead. Aortic rupture is well described in horses but the pathogenesis is not well understood.  It can occur due to predisposing vascular lesions (medial fragmentation, degeneration, mineralization), aneurysms, copper deficiency, elastin defects, or hypertension. Given that there were plaque-like areas of osseous-like metaplasia palpated in the aorta, it is likely that these areas affected the integrity of the wall of the aorta and impacted the ability of the vessel to expand with sudden changes in vascular pressure and/or caused increased vascular fragility.
  • Outbreak of blindness: one horse went blind w/ cataracts, then 3 others from same field. Leptospirosis testing (serum) was negative. The ciliary body lesions including the eosinophilic membrane were confirmed to be amyloid, the intra-epithelial rod-shaped cytoplasmic inclusion and the lymphoplasmacytic uveitis all support the diagnosis of Equine Recurrent Uveitis (ERU). ERU is a common cause of cataracts and blindness in horses and mules. The condition is not fully understood but most likely represents an organ specific immune-mediated disease with hypersensitivity to an infectious agent. Leptospira interrogans serovar pomona is most commonly implicated. A recent retrospective report of equine ocular disorders found ERU as the second and third most prevalent disease in autopsies and enucleations (Flores, J Vet Diagn Invest. 2020). In addition to Leptospira sp. infection, some cases were associated with sepsis secondary to Rhodococcus equi infection, Borrelia burgdorferi (spirochete), some nematode parasites and viruses, ocular neoplasia (not seen in this case), and anterior segment dysgenesis (not seen in this case). This case was presented at AHL pathologists rounds and it was agreed that an “outbreak” due to ERU is very odd and unlikely.
  • 2 year old miniature gelding was found dead in his stall and was diagnosed with NSAID toxicosis. The histopathologic lesions in right dorsal colon, esophagus, and stomach confirmed the gross findings, and were consistent with NSAIDs toxicity affecting the gastro-intestinal mucosa. The right dorsal colon is a common site for NSAIDs induced colitis and ulceration that is caused by the inhibition of cyclooxygenase (COX) enzyme, which mediates prostaglandin E2 cytoprotection in the gastrointestinal tract. The reduction of COX-2 enzyme is a known cause of hypoxic or ischemic damage to the mucosa of the GI, including esophagus and stomach.
  • 8 year old Warmblood mare diagnosed with equine multinodular pulmonary fibrosis. Ultrasound examination showed disseminated nodules on the surface of both lungs and visible in more than 50% of the images. Nodules were smooth and rounded and of soft tissue density. FNA and biopsy for cytology and histopathology were performed: cytology showed a mixed inflammation (multiple white cells), evidence of recent hemorrhage, foamy macrophages exhibiting frequent evidence of erythrophagia and well preserved to mildly lytic neutrophils with occasional small lymphocytes and mast cells. No etiological agents were observed. The nodules described on imaging were palpable in the lungs at postmortem. Grossly, the affected tissue appeared similar to the adjacent lung. The histologic lesions are generally consistent with equine multinodular pulmonary fibrosis (EMPF) although there were no intranuclear inclusion bodies apparent in the alveolar macrophages, and neutrophils are more numerous than is often seen in EMPF. The IDEXX results for the EHV-5 PCR on the submitted fresh-frozen lung tissue was positive and confirmed the histologic diagnosis of equine multinodular pulmonary fibrosis.
Alison Moore and Hannah Golightly


Immediately Notifiable Diseases: Case Reports to OMAFRA

West Nile Virus:

  • There were 5 cases of WNV diagnosed in Q3 (July-September 2023). 4 horses died or were euthanized.

Eastern Equine Encephalitis: There were 16 horses diagnosed with eastern equine encephalitis in Q3. 15 horses died and the majority of cases were mares. There was a cluster of cases in the City of Ottawa located near a large swamp.

Strangles: During Q3 there were 55 positive S. equi tests and 6 facilities managing Strangles.

Equine Herpesvirus: There were 3 cases of EHM due to EHV-1 in Q3.

Equine Syndromic Surveillance:

Graphs of disease syndromes based on samples sent for testing to the Animal Health Laboratory. This information is compiled based on the type of sample, test ordered, and key terms included in the submission history (if provided).

Please follow:

Outbreaks | Equine Disease Communication Center (equinediseasecc.org) for reported outbreaks!

Syndromic and AHL Laboratory Data Surveillance Dashboard

Survey – Key points

  • 27 Counties represented
  • 57% equine, 24% equine and food animal, 10% mixed animal and 10% referral practice veterinarians responded.
  • 25% of veterinarians reported working with pleasure/backyard horses, 22% with Performance/Competition/Show horses, 19% foals, breeding and young stock, 15% draft horses, 9% mules/donkeys, 8% racehorses, and 3% buggy horses.
  • Increase in (foal) pneumonia, Strangles, diarrhea, gastric ulcers, angular limb deformities; (adult) Equine asthma, Strangles, viral URT outbreak, Potomac Horse Fever, EGUS, surgical and non-surgical colics, EHM, EPM, WNV, EEEv, Sidewinder condition, fungal skin diseases, sardoidosis, cellulitis, cutaneous habronemiasis, resistant uterine infections, EMS, laminitis, PPID, liver failure, mud fever, immune-meditated keratitis, vaccine reactions.

New conditions or those without a diagnosis:

  • Possible case of photic headshaking
  • Immune-mediated hemolytic anemia
  • Suspect Cutaneous habronemiasis. Migrating under 1 cm cutaneous masses on neck. Non migrating other under 1cm masses with alopecia around throatlatch and tail. Extreme full body pruritis.
  • Respiratory difficulty that did not respond well to treatment (during wildfire smoke) – nor aservo or pred/ventipulmin
  • Acute respiratory disease with pleural effusion, febrile in the morning and in shock within 6 hours. Went to OVC but did not survive.
  • LH lameness that seemed to start as a cellulitis but after that resolved the horse had a toe drag and inability to draw the limb forward without knuckling over. PT intact. No pain on limb and full range of motion, middle gluteal specifically flaccid with sudden atrophy and very muted response on electro-stim. Could bear weight on the left when other hind picked up. SAA normal, CK/AST normal, high EPM titer. Currently treating as EPM/nerve injury. Outcome TBD.
  • Lots of FUO—suspect Potomac Horse Fever or related diseases and seem to respond to tetracycline.
  • Unilateral lymphadenopathy without respiratory signs, mass besides right kidney, unexplained neurological disease (ataxia)
  • Increase in Salmonella results
There was an increase in the percentage of positive S. equi PCR tests in Q3 to 81.9%. This includes testing of clinical Strangles cases, retesting and screening for movement of horses between facilities.
The number of positive tests for PHF was increased in Q3 compared to 2022 Q3 but approached more typical numbers for this time of year.
There was 1 positive test for EHV-1 this quarter and 1 positive test that occurred in the next quarter, but the horse showed signs in Q3. One other positive test came from another laboratory.
The number of horses submitted to AHL for postmortem in Q2 are slightly decreased to those of Q2 2022.
The percentage of pathologic diagnoses in Q3 2023 was very similar to Q3 2022.

OAHN Project of the Bovine, Equine, and Small Ruminant Networks:  Identification of Culicoides species found in selected areas of Ontario from June – September 2022.

Project Lead: Katie Clow with student Valentina Gonzalez Rodriguez

Collaborators: Jocelyn Jansen, Cynthia Miltenburg, Alison Moore, Tanya Rossi


Culicoides spp. are a genus of biting midges that are important vectors of several viruses, including bluetongue virus (BTV) and epizootic hemorrhagic disease virus (EHDV) in ruminants, as well as African Horse Sickness. Ontario has many native Culicoides spp. which are not competent vectors of these viruses. However, the recent detection of these viruses in previously unreported areas of Ontario, Canada, suggests the possibility of a northward expansion of new species of Culicoides. BTV serotype 13 was detected in cattle in 2015 and EHDV detected in deer in 2017 and 2021. These changes warrant increased surveillance of these species to identify potential changes in disease risk to wild and domestic ruminant populations. The objective of this project was to describe spatial and temporal patterns of Culicoides spp. in select areas of Ontario that have not been previously sampled.

Research Design

In this study, field sampling was conducted at 9 selected sites in Ontario, consisting of ovine, bovine, and equine farms. Two ultraviolet blacklight traps were set up on each premises and run for three consecutive nights every other week from June to September 2022. Trap collections were preserved in a salt solution and then Culicoides spp. were separated from bycatch in the laboratory and stored in 95% ethanol. A subset of samples were morphologically identified using a stereoscope and identification keys. The remaining collections were classified using the environmental DNA (eDNA) in the ethanol preservation solution with high-throughput sequencing targeting the cytochrome oxidase subunit 1 (COI) gene. Spatial analysis was conducted to examine the distribution of 3 different Culicoides species of interest.


A diversity of Culicoides spp. were detected across the farms during the sampling time frame. Culicoides subgenus Avaritia was detected on all premises. This subgenus includes three species that have been confirmed as vectors for BTV in Europe. Further molecular differentiation of a subset of samples confirmed the presence of these three species; C. chiopterus was found on one premises, C. obsoletus on all premises, and C. sanguisuga on four premises. Subgenus Monoculicoides was detected on seven premises. This subgenus includes the known vector species for BTV and EHDV, C. sonorensis. Presence of C. sonorensis was confirmed via molecular methods at 2 premises, one in central Ontario and one in eastern Ontario. Culicoides stellifer is suspected to be a vector for both BTV and EHDV and was detected on all premises.

This study highlights that Culicoides spp. of animal health concern are present in the province in several areas. Given minimal previous surveillance, it is challenging to contextualize these findings. Longitudinal monitoring across areas of southern and eastern Ontario for Culicoides spp. would greatly enhance our ability to monitor changes in the vector population and assess the risk to animal health.

– C Miltenburg, OAHN Bovine Network.

Equine research from Ontario and around the world

Researchers in Ontario

Intimate Partner Violence, Animal Maltreatment, and Barriers to Safety for Survivors with Companion Animals and Livestock: Findings From a Qualitative Study.Giesbrecht CJ, Fletcher AJ, Wuerch MA.Violence Against Women. 2023 Nov 3

Association of the type of metabolic acidosis and non-survival of horses with colitis.Giraldo AF, Carballo R, Serrenho RC, Tran V, Valverde A, Renaud DL, Gomez DE.Can Vet J. 2023 Nov;64(11):1044-1050.

Morphine concentrations in distal thoracic limb synovial fluid following intravenous regional limb perfusion in horses.Valverde A, Cribb N, Arroyo L.Can J Vet Res. 2023 Oct;87(4):254-259.

Heavy metal cellulitis in a nine-year-old gelding Belgian Warmblood.McMahill BG, Alffolter VK, Sykes C, Poppenga R, Fine M, Kraipowich N.Vet Dermatol. 2023 Dec;34(6):621-623. doi: 10.1111/vde.13201. Epub 2023 Sep 24.

Longitudinal effects of oral administration of antimicrobial drugs on fecal microbiota of 
horses.Gomez D, Toribio R, Caddey B, Costa M, Vijan S, Dembek K.J Vet Intern Med. 2023 Sep 8. doi: 10.1111/jvim.16853. Online ahead of print.PMID: 37681574 Free article.

Comparison of the broncoalveolar lavage fluid proteomics between foals and adult horses.Rivolta AA, Bujold AR, Wilmarth PA, Phinney BS, Navelski JP, Horohov DW, Sanz MG.PLoS One. 2023 Sep 5;18(9):e0290778. doi: 10.1371/journal.pone.0290778. eCollection 2023.PMID: 37669266 Free PMC article.

Modified abaxial sesamoid nerve block provides enhanced proximal diffusion compared to basisesamoid block and lower proximal diffusion than traditional low plantar nerve block in equine hind limbs: ex vivo and in vivo study.Estrada RJ, Alvarado GJ, Vargas A, Vargas J, Vargas D, Chacón R, Razquin P, Vindas R.J Am Vet Med Assoc. 2023 Aug 29:1-6. doi: 10.2460/javma.23.04.0212.

Overview of Equine Stem Cells: Sources, Practices, and Potential Safety Concerns.Koch TG, Kuzma-Hunt AG, Russell KA.Vet Clin North Am Equine Pract. 2023 Dec;39(3):461-474. doi: 10.1016/j.cveq.2023.06.008. Epub 2023 Aug 11.

Ten resources for understanding bias in health research: EBM live workshop 2022.
Nunan D, Bashir K, Bilimoria K, Birdi J, Campbell F, Dean R, Downer MB, Costa GG, Golob MM, Heintzman A, Howe MS, Karunananthan S, Kurup KK, Leinberger-Jabari A, Luo Y, Mathe N, Miguel RTD, Morrow RL, Scobie C, South V, Stavisky J, Yadav UN.BMJ Evid Based Med. 2023 Oct;28(5):337-340. doi: 10.1136/bmjebm-2023-112344. Epub 2023 Jul 21.

Researchers around the world

Genetic analysis of the equine orthologues for human CYP2D6: unraveling the complexity of the CYP2D family in horses.Scantamburlo G, Nofziger C, Paulmichl M, Vanoni S.Front Vet Sci. 2023 Oct 19;10:1188633. doi: 10.3389/fvets.2023.1188633. eCollection 2023.PMID: 37929279 Free PMC article.

Xenogeneic equine stem cells activate anti-tumor adaptive immunity in a 4T1-based intraductal mouse model for triple-negative breast cancer: proof-of-principle.Steenbrugge J, Pauwelyn G, Demeyere K, Devriendt N, de Rooster H, Sanders NN, Spaas JH, Meyer E.Front Immunol. 2023 Oct 20;14:1252374. doi: 10.3389/fimmu.2023.1252374. eCollection 2023.PMID: 37928528 Free PMC article.

A study of the impact of the COVID-19 pandemic on equine veterinary care in the UK.Allen SE, O’Neill DG, Cardwell JM, Verheyen KLP, Brodbelt DC.Vet Rec Open. 2023 Nov 2;10(2):e74. doi: 10.1002/vro2.74. eCollection 2023 Dec.PMID: 37927814 Free PMC article.

Genome-wide epigenetic modifications in sports horses during training as an adaptation phenomenon.Cappelli K, Mecocci S, Porceddu A, Albertini E, Giontella A, Miglio A, Silvestrelli M, Verini Supplizi A, Marconi G, Capomaccio S.Sci Rep. 2023 Nov 1;13(1):18786. doi: 10.1038/s41598-023-46043-w.PMID: 37914824 Free PMC article.

Radiographic analysis of the dorsal hoof wall thickness in clinically normal draft horses.Larsen CD, Wilkinson TE, Roberts GD, Guess SC, Mattoon JS, Sanz MG.Am J Vet Res. 2023 Nov 1:1-4. doi: 10.2460/ajvr.23.06.0145. Online ahead of print.PMID: 37903451 Free article.

Training vs. racing: A comparison of arrhythmias and the repeatability of findings in Thoroughbred Chuckwagon racehorses.Massie SL, Bezugley RJ, McDonald KJ, Léguillette R.Vet J. 2023 Oct 28;300-302:106040. doi: 10.1016/j.tvjl.2023.106040. Online ahead of print.PMID: 37898456 Free article.

Potential risk factors for fetal loss due to umbilical cord torsion in the mare.Christoffersen M, Nielsen SB, Madvig CB, Agerholm JS.Theriogenology. 2023 Oct 23;214:182-186. doi: 10.1016/j.theriogenology.2023.10.026. Online ahead of print.PMID: 37897846 Free article.

Detection of Selected Equine Respiratory Pathogens in Stall Samples Collected at a Multi-Week Equestrian Show during the Winter Months.Lawton K, Runk D, Hankin S, Mendonsa E, Hull D, Barnum S, Pusterla N.Viruses. 2023 Oct 11;15(10):2078. doi: 10.3390/v15102078.PMID: 37896855 Free PMC article.

Olfactory Stimulation as Environmental Enrichment for Domestic Horses-A Review.Bini de Lima AC, Sebastião da Fé VC, Palermo Hernandes MS, Oliveira Dos Santos VM.Animals (Basel). 2023 Oct 12;13(20):3180. doi: 10.3390/ani13203180.PMID: 37893904 Free PMC article.

Hoof Expansion, Deformation, and Surface Strains Vary with Horseshoe Nail Positions.Dahl VE, Singer ER, Garcia TC, Hawkins DA, Stover SM.Animals (Basel). 2023 Jun 4;13(11):1872. doi: 10.3390/ani13111872.PMID: 37889766 Free PMC article.

Influence of Intrauterine Fluid Detection, Number of Transfers and Age of the Recipient on Pregnancy Rate and Early Embryonic Loss in a Commercial Embryo Transfer Program.Donato GG, Necchi D, Vandaele H, Vita ME, Bertero A, Vincenti L, Nervo T.Animals (Basel). 2023 May 29;13(11):1799. doi: 10.3390/ani13111799.PMID: 37889745 Free PMC article.

Testing and Refining the Ethical Framework for the Use of Horses in Sport.Brown B, Cardwell JM, Verheyen KLP, Campbell MLH.Animals (Basel). 2023 May 31;13(11):1821. doi: 10.3390/ani13111821.PMID: 37889722 Free PMC article.

The Impact of Two Recommended Withholding Periods for Omeprazole and the Use of a Nutraceutical Supplement on Recurrence of Equine Gastric Ulcer Syndrome in Thoroughbred Racehorses.Shan R, Steel CM, Sykes B.Animals (Basel). 2023 May 31;13(11):1823. doi: 10.3390/ani13111823.PMID: 37889700 Free PMC article.

Poor Association between Facial Expression and Mild Lameness in Thoroughbred Trot-Up Examinations.Anderson KA, Morrice-West AV, Wong ASM, Walmsley EA, Fisher AD, Whitton RC, Hitchens PL.Animals (Basel). 2023 May 23;13(11):1727. doi: 10.3390/ani13111727.PMID: 37889660 Free PMC article.

Efficacy and Safety of Subcutaneous Allergen-Specific Immuno-Therapy in Horses with Allergic Cutaneous and Respiratory Diseases-A Systematic Review.Herrmann I, Sanchez AJ.Vet Sci. 2023 Oct 10;10(10):613. doi: 10.3390/vetsci10100613.PMID: 37888565 Free PMC article. Review.

Intra-articular bone marrow mononuclear cell therapy improves lameness from naturally occurring equine osteoarthritis.Everett JB, Menarim BC, Barrett SH, Bogers SH, Byron CR, Pleasant RS, Werre SR, Dahlgren LA.Front Vet Sci. 2023 Oct 9;10:1256284. doi: 10.3389/fvets.2023.1256284. eCollection 2023.PMID: 37876630 Free PMC article.

Upper airway endoscopy in exercising horses: Findings in 164 barrel racing horses with respiratory clinical signs and/or poor performance.Massie SL, Léguillette R.Vet J. 2023 Oct 21;300-302:106038. doi: 10.1016/j.tvjl.2023.106038. Online ahead of print.PMID: 37865154 Free article.

Short-term effects of canagliflozin on glucose and insulin responses in insulin dysregulated horses: A randomized, placebo-controlled, double-blind, study.Lindåse S, Nostell K, Forslund A, Bergsten P, Bröjer J.J Vet Intern Med. 2023 Oct 21. doi: 10.1111/jvim.16906. Online ahead of print.PMID: 37864426 Free article.

Verification of documentation plausibility in equine passports-drug documentation for geldings in comparison to self-reported veterinarian drug usage for equine castrations in Germany.Schneider ST, Isbrandt R, Gehlen H, Langkabel N, Meemken D.PLoS One. 2023 Oct 18;18(10):e0292969. doi: 10.1371/journal.pone.0292969. eCollection 2023.PMID: 37851658 Free PMC article.

Percutaneous ultrasonic debridement of equine tendinopathy and desmopathy: A report of 10 cases.Vlahos TP.Open Vet J. 2023 Sep;13(9):1141-1149. doi: 10.5455/OVJ.2023.v13.i9.10. Epub 2023 Sep 30.PMID: 37842115 Free PMC article.

Chemical composition of horse hooves with functional qualities for competing barefoot. Spörndly-Nees E, Jansson A, Pökelmann M, Pickova J, Ringmark S.J Anim Sci. 2023 Jan 3;101:skad346. doi: 10.1093/jas/skad346.PMID: 37814393 Free PMC article.

Evaluation of seasonal influences on adrenocorticotropic hormone response to the thyrotropin-releasing hormone stimulation test and its accuracy for diagnosis of pituitary pars intermedia dysfunction. Adams AA, Siard-Altman MH, Reedy SE, Barker D, Elzinga S, Sanz MG, Urschel K, Ireland JL.Vet J. 2023 Oct 5;300-302:106035. doi: 10.1016/j.tvjl.2023.106035. Online ahead of print.PMID: 37802466 Free article.

Right dorsal colitis in horses: A multicenter retrospective study of 35 cases. Flood J, Byrne D, Bauquier J, Agne GF, Wise JC, Medina-Torres CE, Wood K, Sullivan O, Stewart AJ.J Vet Intern Med. 2023 Oct 6. doi: 10.1111/jvim.16884. Online ahead of print.PMID: 37800408 Free article.

Temporomandibular joint biomechanics and equine incisor occlusal plane maintenance. Sterkenburgh TR, Hartl B, Peham C, Nowak M, Kyllar M, Kau S.Front Bioeng Biotechnol. 2023 Sep 20;11:1249316. doi: 10.3389/fbioe.2023.1249316. eCollection 2023.PMID: 37799811 Free PMC article.

Distribution of degenerative changes in the equine endometrium as observed in a single versus two biopsies.Muderspach ND, Troedsson MHT, Ferreira-Dias G, Agerholm JS, Christoffersen M.Theriogenology. 2024 Jan 1;213:52-58. doi: 10.1016/j.theriogenology.2023.09.018. Epub 2023 Sep 25.PMID: 37797529 Free article.

A case of equine piroplasmosis in the Tokyo 2020 Olympic Games. Aida H, Foreman JH, Ochi A, Takizawa Y, Yamanaka T.J Equine Sci. 2023 Sep;34(3):93-99. doi: 10.1294/jes.34.93. Epub 2023 Sep 8.PMID: 37781566 Free PMC article.

Diagnosis of equine endocrinopathies: The value of measuring blood glucose during an oral glucose test. de Laat MA, Sillence MN.Vet J. 2023 Sep 29;300-302:106034. doi: 10.1016/j.tvjl.2023.106034. Online ahead of print.PMID: 37778651 Free article.

Efficacy of the oral supplement, Equine Omega Complete, for the prevention of gastric ulcers and alpha-tocopherol supplementation in horses. Williams Louie E, Nieto J, Wensley F, Morgan JM, Finno CJ, Berryhill EH.J Vet Intern Med. 2023 Sep 29. doi: 10.1111/jvim.16877. Online ahead of print.PMID: 37775973 Free article.

Selected Acoustic Frequencies Have a Positive Impact on Behavioural and Physiological Welfare Indicators in Thoroughbred Racehorses. Gueguen L, Henry S, Delbos M, Lemasson A, Hausberger M.Animals (Basel). 2023 Sep 20;13(18):2970. doi: 10.3390/ani13182970.PMID: 37760370 Free PMC article.

Metacarpal/Tarsal Parasagittal Groove and Proximal Phalanx Sagittal Groove Fissures in Thoroughbred Horses.Lin ST, Foote AK, Bolas NM, Peter VG, Pokora R, Patrick H, Sargan DR, Murray RC.Animals (Basel). 2023 Sep 14;13(18):2912. doi: 10.3390/ani13182912.PMID: 37760312 Free PMC article.

Visually Assessing Equine Quality of Movement: A Survey to Identify Key Movements and Patient-Specific Measures. Bowen AG, Tabor G, Labens R, Randle H.Animals (Basel). 2023 Sep 5;13(18):2822. doi: 10.3390/ani13182822.PMID: 37760222 Free PMC article.

Endoscopic Anatomy of the Equine Guttural Pouch: An Anatomic Observational Study. Piat P, Cadoré JL.Vet Sci. 2023 Aug 26;10(9):542. doi: 10.3390/vetsci10090542.PMID: 37756064 Free PMC article.

Associations between postrace atrial fibrillation and measures of performance, racing history and airway disease in horses. Nath LC, Elliott A, La Gerche A, Weir J, Forbes G, Thomas G, Franklin S.J Vet Intern Med. 2023 Sep 23. doi: 10.1111/jvim.16878. Online ahead of print.PMID: 37740606 Free article.

Fecal microbiota transplant for treatment of diarrhea in adult hospitalized horses-111 cases (2013-2018).Quattrini C, Bozorgmanesh R, Egli P, Magdesian KG.Open Vet J. 2023 Sep;13(9):1135-1140. doi: 10.5455/OVJ.2023.v13.i9.9. Epub 2023 Sep 30.PMID: 37842104 Free PMC article.

Intravenous Injection of Sodium Hyaluronate Diminishes Basal Inflammatory Gene Expression in 
Equine Skeletal Muscle.Gregg SR, Barshick MR, Johnson SE.Animals (Basel). 2023 Sep 27;13(19):3030. doi: 10.3390/ani13193030.PMID: 37835636 Free PMC article.

Low progesterone concentration in early pregnancy is detrimental to conceptus development and pregnancy outcome in horses. Wagner LH, Aurich J, Melchert M, Okada CTC, Gautier C, Kaps M, Claaßen S, Aurich C.Anim Reprod Sci. 2023 Oct;257:107334. doi: 10.1016/j.anireprosci.2023.107334. Epub 2023 Sep 16.PMID: 37725863 Free article.

The Emerging Role of Hypoxic Training for the Equine Athlete. Davie A, Beavers R, Hargitaiová K, Denham J.Animals (Basel). 2023 Sep 3;13(17):2799. doi: 10.3390/ani13172799.PMID: 37685063 Free PMC article.

Let Them Be the Judge of That: Bias Cascade in Elite Dressage Judging. Wolframm I.Animals (Basel). 2023 Sep 3;13(17):2797. doi: 10.3390/ani13172797.PMID: 37685061 Free PMC article.

Selective Anthelmintic Treatment in Horses in Sweden Based on Coprological Analyses: Ten-Year Results. Osterman-Lind E, Holmberg M, Grandi G.Animals (Basel). 2023 Aug 28;13(17):2741. doi: 10.3390/ani13172741.PMID: 37685005 Free PMC article.

Promoting veterinary medication safety – Exploring the competencies of community pharmacy professionals in veterinary pharmacotherapy. Immonen H, Raekallio MR, Holmström AR.Vet Anim Sci. 2023 Aug 19;21:100310. doi: 10.1016/j.vas.2023.100310. eCollection 2023 Sep.PMID: 37664413 Free PMC article.

Assessing the impact of draught load pulling on welfare in equids. Bukhari SSUH, Parkes RSV.Front Vet Sci. 2023 Aug 17;10:1214015. doi: 10.3389/fvets.2023.1214015. eCollection 2023.PMID: 37662986 Free PMC article. Review.

Effects of wearable therapies on jump performance in sport horses.Schmidt TE, Gleason CB, Samaniego MR, White RR.Front Vet Sci. 2023 Sep 26;10:1235932. doi: 10.3389/fvets.2023.1235932. eCollection 2023.PMID: 37822954 Free PMC article.


Interested in knowing more about trace minerals status in Ontario beef cattle herds including low selenium and high molybdenum?  Find out more here.

Interested in knowing more about the small ruminant network’s investigation into gastrointestinal nematode parasitism on Ontario goat farms? Find out more here.

ResearchONequine.ca is a website developed by the Ontario Animal Health Network equine network to help increase research awareness and to connect researchers from academia, industry and government with the ultimate goal of improving the lives of all equines. It was supported by OAHN and the Ontario Association of Equine Practitioners.

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