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Topic:Equine Health

Equine health encompasses the study and management of diseases, disorders, and overall well-being of horses. It involves understanding various physiological systems, preventive care, and treatment strategies to maintain optimal health in equine populations. Common areas of focus include nutrition, infectious diseases, orthopedic conditions, and reproductive health. Research in equine health aims to advance knowledge on diagnostic methods, therapeutic interventions, and management practices that improve horse welfare and performance. This page collects peer-reviewed research studies and scholarly articles that explore the diverse aspects of equine health, offering insights into current findings and advancements in the field.
Beta-subunits of equine chorionic gonadotropin and lutenizing hormone with an identical amino acid sequence have different asparagine-linked oligosaccharide chains.
Biochemical and biophysical research communications    January 31, 1991   Volume 174, Issue 2 940-945 doi: 10.1016/0006-291x(91)91509-b
Matsui T, Sugino H, Miura M, Bousfield GR, Ward DN, Titani K, Mizuochi T.The glycoprotein hormones, equine chorionic gonadotropin (eCG) and lutenizing hormone (eLH), possess a beta-subunit with an identical amino acid sequence. The Asn-linked oligosaccharide chains of eCG beta and eLH beta were quantitatively liberated as tritium-labeled oligosaccharides by hydrazinolysis followed by N-acetylation and NaB3H4-reduction. Paper electrophoresis in combination with sialidase digestion and solvolytic desulfation indicated that eCG beta contained neutral and sialylated oligosaccharides, while eLH beta contained neutral, sialylated, sulfated, and both sialylated and sulfat...
Atrial septal defect and atrial fibrillation in a foal.
The Veterinary record    January 26, 1991   Volume 128, Issue 4 80-81 doi: 10.1136/vr.128.4.80
Taylor FG, Wotton PR, Hillyer MH, Barr FJ, Lucke VM.Clinical examination of a four-and-a-half-month old foal revealed evidence of progressive heart failure associated with an atrial septal defect and atrial fibrillation. Atrial septal defects are rarely reported in foals and the foal's growth, development and demeanour were normal until a sudden onset of lethargic behaviour. The value of B-mode echocardiography in identifying the congenital lesion is indicated.
Determination of isoxsuprine in equine plasma by high-performance liquid chromatography with electrochemical detection.
Journal of chromatography    January 18, 1991   Volume 563, Issue 1 216-223 doi: 10.1016/0378-4347(91)80299-r
Hashem A, Lubczyk B.No abstract available
Prognostic factors and survival of horses with ocular/adnexal squamous cell carcinoma: 147 cases (1978-1988).
Journal of the American Veterinary Medical Association    January 15, 1991   Volume 198, Issue 2 298-303 
Dugan SJ, Roberts SM, Curtis CR, Severin GA.Between January 1978 and December 1988, 147 horses with ocular/adnexal squamous cell carcinoma (SCC) were admitted to the Colorado State University Veterinary Teaching Hospital (CSU-VTH). Diagnosis was confirmed by histologic examination of appropriate tissue specimens. Medical records and communication with owners, referring veterinarians, or both provided information regarding initial examination, treatment at the CSU-VTH, and final outcome. At initial examination, 123 (83.7%) horses had unilateral involvement and 24 (16.3%) horses had bilateral involvement. The nictitating membrane, nasal c...
Epidemiologic study of ocular/adnexal squamous cell carcinoma in horses.
Journal of the American Veterinary Medical Association    January 15, 1991   Volume 198, Issue 2 251-256 
Dugan SJ, Curtis CR, Roberts SM, Severin GA.Proportional hospital accession ratios for equine ocular/adnexal squamous cell carcinoma (SCC) were determined for 14 colleges of veterinary medicine participating in the Veterinary Medical Data Program between January 1978 and December 1986. Comparison of the ratios with their respective geographical, physical data has shown an increased prevalence of SCC with an increase in longitude, altitude, or mean annual solar radiation. In contrast, prevalence of SCC increased with a decrease in latitude. Between January 1978 and December 1988, 147 horses with ocular/adnexal SCC were admitted to the Co...
[A horse seropositive for Ehrlichia risticii].
Tijdschrift voor diergeneeskunde    January 15, 1991   Volume 116, Issue 2 69-72 
van der Kolk JH, Bernadina WE, Visser IJ.A four year old Dutch warmblooded mare was born and raised in the province of North-Brabant, the Netherlands. On May 16, 1989, she showed signs of colic, anorexia, depression, ileus, severe dehydration and leukopenia. When the mare collapsed, euthanasia was carried out. Acute colitis and cytoplasmic inclusion bodies in macrophages were observed at autopsy. When an indirect immunofluorescence assay was performed, the Ehrlichia risticii titre of the serum was found to be 1:640.
Use of gastrotomy to relieve esophageal obstruction in a horse.
Journal of the American Veterinary Medical Association    January 15, 1991   Volume 198, Issue 2 295-296 
Orsini JA, Dikes N, Ruggles A, Charlton C, Perry R.Esophageal obstruction of 1 week's duration in a gelding was diagnosed by contrast radiography and esophagoscopy. A food bolus was found at the junction of the caudal thoracic portion of the esophagus and the cardia. A gastrotomy was performed through a cranial abdominal incision and a phytobezoar was manually broken down and removed. The gelding was started on complete pellet food and water on the fifth day after surgery. The horse remained clinically normal more than 1 year after surgery.
Atypical myoglobinuria.
The Veterinary record    January 12, 1991   Volume 128, Issue 2 44 doi: 10.1136/vr.128.2.44-a
Robinson HC.No abstract available
Interpretation of dope test results in racehorses.
The Veterinary record    January 12, 1991   Volume 128, Issue 2 41 doi: 10.1136/vr.128.2.41
Sanford J.No abstract available
Myocardial blood flow, metabolism, and function with repeated brief coronary occlusions in conscious ponies.
The American journal of physiology    January 11, 1991   Volume 260, Issue 1 Pt 2 H100-H109 doi: 10.1152/ajpheart.1991.260.1.H100
Williams DO, Boatwright RB, Rugh KS, Garner HE, Griggs DM.Studies were performed in the conscious pony instrumented with a Doppler flow probe and hydraulic occluder on the left anterior descending coronary artery (LAD), sonomicrometry crystals and intraventricular micromanometer in the left ventricle, and catheters in the left atrium and anterior interventricular vein. Two-minute LAD occlusions were performed every 30 min continuously or during working hours. Data on release of catabolites (potassium, hydrogen ions, and lactate) and norepinephrine from the initially dysfunctional region were obtained periodically during a regimen of 445 +/- 56 occlus...
Atlantoaxial malformation in a half-Arabian colt.
The Cornell veterinarian    January 11, 1991   Volume 81, Issue 1 67-75 
Blikslager AT, Wilson DA, Constantinescu GM, Miller MA, Corwin LA.A 1-year-old half-Arabian colt was referred for evaluation of a cranial cervical abnormality. Physical examination revealed the left wing of the atlas to be more ventral than the right wing. A head tilt, with the pole deviated to the left, was present because of the malpositioned atlas. Neurologic examination identified symmetrical weakness, ataxia, and proprioceptive deficits in all four limbs. Radiographs of the cranial cervical region revealed fusion of the atlas and axis, and deviation of the atlantoaxial joint to the left of the median plane. Euthanasia was elected. Necropsy confirmed the...
Effect of age and season on the establishment of spermatogenesis in the horse.
Journal of reproduction and fertility. Supplement    January 11, 1991   Volume 44 87-97 
Johnson L, Varner DD, Thompson DL.To determine the age at which adult values for hormonal and testicular characteristics are established, testes and blood from 123 slaughtered horses, aged 1-5 years, were compared. Serum concentrations of follicle-stimulating hormone (FSH), luteinizing hormone (LH) and testosterone (T) and intratesticular testosterone (ITT) were determined by radio-immunoassay. Specimens were obtained in the non-breeding (n = 46) or breeding (n = 43) season in Experiment 1 (Exp. 1) and in the breeding (n = 34) season in Experiment 2 (Exp. 2). Testicular parenchyma was fixed in glutaraldehyde and homogenized to...
Calmodulin-mediated adenylyl cyclase from equine sperm.
Methods in enzymology    January 11, 1991   Volume 195 91-110 doi: 10.1016/0076-6879(91)95157-f
Toscano WA, Gross MK.No abstract available
Immunohistochemical diagnosis of protozoan parasites in lesions of equine protozoal myeloencephalitis. Granstrom DE, Giles RC, Tuttle PA, Williams NM, Poonacha KB, Petrites-Murphy MB, Tramontin RR, Swerczek TW, Hong CB, Rezabek GB.No abstract available
Molecules of the early equine trophoblast.
Journal of reproduction and fertility. Supplement    January 1, 1991   Volume 44 455-462 
Oriol JG, Donaldson WL, Dougherty DA, Antczak DF.Three monoclonal antibodies raised against equine trophoblast cells were tested to determine the characteristics of the identified molecules. First, the antibodies were used to precipitate molecules from radiolabelled equine trophoblast cells of the chorionic girdle. Antibody F71.1 precipitated a molecule of 115 kDa, whereas antibodies 71.8 and 71.10 precipitated a molecule of 66 kDa. Second, 2 of the antibodies were used in an indirect immunoperoxidase assay on frozen sections of equine conceptuses of different gestational ages beginning at Day 8. Antibody F71.1 labelled trophoblast cells fro...
[Ethical and analytical problems in man and greater mammals].
Annales pharmaceutiques francaises    January 1, 1991   Volume 49, Issue 2 67-75 
Bourdon R.Toxicomania and doping give rise to an increasing number of drug measurements in the body fluids. Consequently the analysts have to face, at one and the same time, ethical and analytical problems. Should the analyst participate to investigations organised in order to disclose a toxicomania in a working place? The author suggests a positive answer as long as the adduct person benefits to a social and medical care. What is the analytical meaning of a positive test? Taking into account the increasing sensitivity of the methods used, thresholds have to be established, at least for the blood concen...
Partial purification and characterization of rhinoceros gonadotropins, growth hormone, and prolactin: comparison with the horse and sheep.
Biology of reproduction    January 1, 1991   Volume 44, Issue 1 94-101 doi: 10.1095/biolreprod44.1.94
McFarlane JR, Cabrera CM, Coulson SA, Papkoff H.The rhinoceros is an endangered species related to the horse family. Little is known of its reproductive endocrinology. The objectives of this study were to partially purify rhinoceros pituitary hormones, determine which assays could be used for their assessment, and to ascertain whether rhinoceros LH possesses the intrinsic FSH activity of equine LH. A single pituitary each from a White (1.3 g) and a Black (1.2 g) Rhinoceros was homogenized and extracted (pH 9.5), then subjected to pH and salt fractionation, and ion-exchange chromatography (DEAE and Sephadex SP-C50) to yield partially purifie...
Changes in luteinizing hormone bioactivity associated with gonadotrophin pulses in the cycling mare.
Journal of reproduction and fertility. Supplement    January 1, 1991   Volume 44 13-18 
Pantke P, Hyland J, Galloway DB, MacLean AA, Hoppen HO.Equine plasma luteinizing hormone (LH) possesses both biological (in vitro bioassay, B) and immunological (radioimmunoassay, I) activities and the ratio of B:I varies with stage of the oestrous cycle. To estimate the contribution made by pituitary secretion and peripheral metabolism to changes in the B:I ratio, pituitary venous effluent and circulating plasma from 5 dioestrous and 2 oestrous mares were analyzed using both an in vitro bioassay and a radioimmunoassay. During dioestrus, LH was released in a pulsatile fashion with a frequency of 1.4 pulses/24 h and a pulse duration of 20-40 min (c...
Portable data acquisition cart for equine transportation stress study.
Biomedical sciences instrumentation    January 1, 1991   Volume 27 283-289 
Cain PW, Jones JH, Smith BL.A remote data sampling cart has been designed and built for studying environmental factors that produce stress in horses during transportation. This dedicated sampling cart uses an XT-compatible mother board powered by a 12 V battery, with customized BIOS and ROM program. Sampling is performed using two digital and eight A/D (bipolar, differential) channels in burst mode at a frequency of 1 kHz. Digitized data are stored on magnetic tape for retrieval after the experiment. Configuration of sampling parameters is accomplished via a serial communications link to a host computer, and is stored in...
Severe hypercarbia resulting from inspiratory valve malfunction in two anesthetized horses.
Journal of the American Veterinary Medical Association    January 1, 1991   Volume 198, Issue 1 123-125 
Baxter GM, Adams JE, Johnson JJ.Severe hypercarbia was documented by arterial blood gas analysis in 2 adult horses anesthetized for exploratory laparotomy. Both horses appeared to be adequately anesthetized, but continued to breathe against the ventilator. In both cases, the inspiratory valve on the anesthesia machine was found to be stuck open, permitting expired CO2 to return to the inspiratory limb of the anesthetic circuit and to be inhaled with the next breath. Correction of the malfunctioning valve alleviated the hypercarbia. Problems with the flow valves of the anesthesia machine should be suspected when anesthetized ...
Influence of pregnancy on diurnal and seasonal changes in glucose level and activity of FDPA, AlAT and AspAT in mares.
Comparative biochemistry and physiology. A, Comparative physiology    January 1, 1991   Volume 98, Issue 1 31-35 doi: 10.1016/0300-9629(91)90572-t
Flisińska-Bojanowska A, Komosa M, Gill J.1. The diurnal changes in the glucose level and in activity of FDPA, A1AT and AspAT in four pregnant standard-bred mares were studied. 2. As a control four barren mares, were kept and examined in the same conditions. 3. Blood samples were taken every 4 hr for one day, each month, throughout pregnancy, or one year. 4. A diurnal rhythm in activity of A1AT and AspAT in barren mares was found. The pregnancy masked diurnal rhythm in activities of both transaminases. 5. No diurnal rhythm in glucose level and FDPA activity in both groups of mares was observed. 6. Seasonal cyclicity was found in all i...
Closed suction drainage in the treatment of infectious arthritis of the equine tarsocrural joint.
Veterinary surgery : VS    January 1, 1991   Volume 20, Issue 1 21-29 doi: 10.1111/j.1532-950x.1991.tb00301.x
Ross MW, Orsini JA, Richardson DW, Martin BB.Infectious arthritis of the tarsocrural joint was treated in 13 horses with closed suction drainage through a flat, fenestrated, latex (Jackson-Pratt) drain, broad-spectrum antimicrobial agents, nonsteroidal anti-inflammatory drugs, and bandage immobilization. In 11 horses, arthroscopic lavage and debridement were also performed. Ingress drains were placed for lavage in six horses. Ten horses returned to their previous level of competition or were sound. One horse raced but had lameness of the affected tarsocrural joint and dropped in racing class; one horse was euthanatized because of laminit...
In vitro responses of equine digital vessels to dopamine and fenoldopam.
Equine veterinary journal    January 1, 1991   Volume 23, Issue 1 48-52 doi: 10.1111/j.2042-3306.1991.tb02713.x
Baxter GM, Moore JN, Tackett RL.The in vitro responses of isolated vascular preparations of digital arteries and veins obtained from healthy anaesthetised horses were determined for dopamine and fenoldopam. The digital vessels were harvested, cut into 4 mm vascular segments, suspended in tissue baths and attached to force-displacement transducers. Dose-response studies between 10(-8) and 10(-4)M concentrations were performed for all drugs. The change in tension of each vascular ring was measured in grams of force. The reactivity between palmar and plantar digital vessels and baseline vascular responses were determined for do...
Prolongation of xylazine/ketamine induced recumbency time with temazepam in horses.
Equine veterinary journal    January 1, 1991   Volume 23, Issue 1 8-10 doi: 10.1111/j.2042-3306.1991.tb02704.x
Matthews NS, Dollars NS, Young DB, Shawley RV.Short term anaesthesia induced with xylazine and ketamine was compared to a combination of xylazine, ketamine and temazepam (a benzodiazepine) in six adult horses. Duration of recumbency was significantly prolonged when temazepam was administered with xylazine and ketamine. No significant differences in heart rate, respiratory rate, blood pressure or arterial pH, pCO2 and pO2 were seen between the xylazine and ketamine combination plus temazepam, and xylazine and ketamine combination only treated horses.
Rethinking endotoxaemia in 1991.
Equine veterinary journal    January 1, 1991   Volume 23, Issue 1 3-4 doi: 10.1111/j.2042-3306.1991.tb02701.x
Moore JN.No abstract available
Molecular genetic markers. Southern blot analyses of the MET locus in horses and cattle.
Animal genetics    January 1, 1991   Volume 22, Issue 3 307 doi: 10.1111/j.1365-2052.1991.tb00682.x
Lear TL, Bailey E.No abstract available
Parahost behavior of adult Gasterophilus intestinalis (Diptera: Gasterophilidae) in Delaware.
Journal of medical entomology    January 1, 1991   Volume 28, Issue 1 67-73 doi: 10.1093/jmedent/28.1.67
Cope SE, Catts EP.Parahost behavior of adult Gasterophilus intestinalis (DeGeer) was observed during the summers of 1978 and 1979 near pastured horses on two farms near Newark, Del. Adult fly occurrence, although sparse in early summer, indicated a gradual increase, with three surges in emergence. In the laboratory, males lived 1-3 d and females 1-2 d. In the field, marked flies were not seen on days following their release. Adult behavior indicated an urgency in mating and oviposition dictated by a short life span. Male flight patterns were characterized by in-flight searches for females and intraspecific conf...
Mid-metacarpal deep digital flexor tenotomy in the management of refractory laminitis in horses.
Veterinary surgery : VS    January 1, 1991   Volume 20, Issue 1 15-20 doi: 10.1111/j.1532-950x.1991.tb00300.x
Hunt RJ, Allen D, Baxter GM, Jackman BR, Parks AH.Deep digital flexor tendon transection at the mid-metacarpus was performed in 20 horses with severe acute or chronic laminitis that was not responsive to conventional treatment. Sixteen horses improved within 72 hours, one horse worsened, and two horses were unaffected by the surgery. Eleven horses survived less than 1 month after surgery and six horses survived longer than 6 months. Three horses surviving longer than 6 months have remained lame and no horse has returned to athletic performance. Transection of the deep digital flexor tendon at the mid-metacarpus may decrease the pain associate...
Effects of furosemide on ponies with recurrent airway obstruction.
Pulmonary pharmacology    January 1, 1991   Volume 4, Issue 4 203-208 doi: 10.1016/0952-0600(91)90012-r
Broadstone RV, Robinson NE, Gray PR, Woods PS, Derksen FJ.The effect of aerosol and intravenous administrations of furosemide was examined in ponies with recurrent obstructive pulmonary disease, commonly called 'heaves'. This recurrent airway disease bears many similarities to human asthma. Six ponies with the disease (principal animals) were studied during clinical remission and during an acute attack of airway obstruction precipitated by stabling and feeding dusty hay. Six control animals were also studied. Furosemide (1.0 mg/kg) or vehicle was administered by aerosol in the first study, and intravenously in a second study. In principal ponies with...
Veterinary dermatohistopathology: what’s new and exciting?
Advances in dermatology    January 1, 1991   Volume 6 289-308 
Scott DW.No abstract available