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Topic:Horses

"Horses" is a broad topic that encompasses various aspects of equine biology, behavior, and management. This category includes studies on the anatomy, physiology, and genetics of horses, as well as their behavior, nutrition, and care. Research in this area may also cover the historical and cultural significance of horses, their roles in agriculture, sport, and therapy, and the challenges associated with their conservation and welfare. The page aggregates peer-reviewed research articles and scholarly studies that explore the multifaceted relationships between humans and horses, examining both scientific and socio-economic perspectives.
Linkage studies between the Tcp-1, Tcp-10, and Mhc-Eqca-A loci in the horse.
Immunogenetics    January 1, 1993   Volume 38, Issue 5 359-362 doi: 10.1007/BF00210478
Langemeier JL, Bailey E, Henney PJ.No abstract available
Fracture of the caudal medial femoral condyle in a horse.
Equine veterinary journal    January 1, 1993   Volume 25, Issue 1 75-77 doi: 10.1111/j.2042-3306.1993.tb02907.x
Dabareiner RM, Sullins KE.No abstract available
Vertebral angiosarcoma in a horse. Kennedy FA, Brown CM.No abstract available
[Indications for ultrasonography in the diagnosis of surgical diseases].
Tierarztliche Praxis. Supplement    January 1, 1993   34-39 
Fritsch R.Ultrasonography has established itself as an invaluable diagnostic aid in surgical diseases. In addition to the diagnosis of thoracic and abdominal disease, ultrasonography is increasing in importance in the examination of muscles, tendons and joints in small animals. In the horse, the application of the technique is being extended from tendon conditions to organ diseases. The optimal diagnostic information can only be achieved through the use of different scanner types.
Closed-circuit liquid injection isoflurane anesthesia in the horse.
Veterinary surgery : VS    January 1, 1993   Volume 22, Issue 1 73-78 doi: 10.1111/j.1532-950x.1993.tb00374.x
Olson KN, Klein LV, Nann LE, Soma LR.Six horses were administered isoflurane anesthesia by liquid injection into a closed breathing circuit according to the square root of time model. The unit dose (UD) was calculated using Lowe's formula to provide an end-tidal concentration of 1.3%, or the minimum alveolar concentration of isoflurane. The mean UD was 4.2 +/- 0.2 mL. The mean end-tidal isoflurane concentration (ETiso) for each interval after injection, and the peak and minimum concentrations for each injection interval, did not change beginning with the second injection, indicating that the square root of time model accurately p...
High prevalence of serum antibodies to equine infectious anemia virus reverse transcriptase.
AIDS research and human retroviruses    January 1, 1993   Volume 9, Issue 1 7-11 doi: 10.1089/aid.1993.9.7
DeVico AL, Issel CJ, Le Grice SF, Payne SL, Montelaro RC, Sarngadharan MG.The immunogenicity of the equine infectious anemia virus (EIAV) reverse transcriptase (RT) was examined by immunoblot assay with recombinant EIAV RT. All of the 19 sera from EIAV-infected horses tested contained antibodies that recognized EIAV RT and directly inhibited the polymerase activity of the enzyme. An examination of sera obtained sequentially from two experimentally infected animals revealed that anti-RT antibodies arise early in infection and increase in level. The appearance of the antibodies correlated with progression toward the asymptomatic period of infection.
A preliminary study of transitions between the walk and trot in dressage horses.
Acta anatomica    January 1, 1993   Volume 146, Issue 2-3 179-182 doi: 10.1159/000147442
Argue CK, Clayton HM.The object of this study was to determine the limb support sequence during the transitions from walk to trot and from trot to walk in dressage horses under saddle and to test the null hypothesis that the limb support sequence during the transitions is not related to the level of training. Sixteen dressage horses training at novice to FEI Grand Prix level were videotaped performing an average of 9 transitions each from walk to trot and from trot to walk. The 30-Hz videotapes were viewed in slow motion, and based on the limb support sequence the transitions were categorized into two types. In ty...
Antagonism of a specific dopaminergic receptor agonist with metoclopramide in horses.
American journal of veterinary research    January 1, 1993   Volume 54, Issue 1 122-125 
Eades SC, Moore JN.Changes in lateral cecal arterial blood flow, mean internal carotid arterial pressure, and heart rate caused by nasogastric administration of fenoldopam (3, 6, and 9 mg/kg of body weight), a selective agonist of dopaminergic receptors, were recorded in 7 healthy horses. Cecal arterial blood flow was significantly increased within 30 minutes after administration of fenoldopam at all 3 dosages, with the peak increases from baseline (67.8 +/- 17.5 ml/min) being 125 +/- 28, 120 +/- 22, and 153 +/- 32 ml/min for 3, 6, and 9 mg/kg, respectively. Although carotid arterial pressure did not change sign...
A type-specific conformational epitope on the nucleocapsid of equid herpesvirus-1 and its use in diagnosis.
Archives of virology    January 1, 1993   Volume 132, Issue 1-2 133-144 doi: 10.1007/BF01309848
van de Moer A, Rice M, Wilks CR.A type-specific monoclonal antibody was produced by immunizing mice with purified equid herpesvirus-1 (EHV-1). The EHV-1 specific mAb reacted with all the EHV-1 strains tested so far by indirect ELISA, immunofluorescence, and immunoperoxidase tests. No reactions were detected with the EHV-4, EHV-2, or EHV-3 strains tested. The indirect immunofluorescence and immunoperoxidase tests showed that the nuclei of infected cells were predominantly stained by this mAb. Triton treatment of the virus and immunogold labeling experiments indicated that the nucleocapsid of EHV-1 was the target antigen of th...
Serum concentrations of ormetoprim/sulphadimethoxine in 1-3-day-old foals after a single dose of oral paste combination.
Equine veterinary journal    January 1, 1993   Volume 25, Issue 1 73-74 doi: 10.1111/j.2042-3306.1993.tb02906.x
Brown MP, Gronwall RR, Cook LK, Houston AE.Ormetoprim (OMP)/sulphadimethoxine (SDM) combinations have been used in the treatment of fowl cholera, colibacillosis, salmonellosis, infectious coryza, and other bacterial infections in poultry (Mitrovic et al. 1969; Maestrone et al. 1979). The drug combination has also been used in the treatment of colibacillosis in neonatal pigs (Brandt and Maestrone 1980) and Pasteurella pneumonia in cattle (Ames et al. 1987). Serum concentrations and pharmacokinetics of SDM (Oh-Ishi and Nakajima 1964; Durr et al. 1980) and OMP/SDM (Brown et al. 1989) after intravenous or oral administration to ad...
Scleral mastocytosis in a horse.
Equine veterinary journal    January 1, 1993   Volume 25, Issue 1 79-80 doi: 10.1111/j.2042-3306.1993.tb02909.x
Ward DA, Lakritz J, Bauer RW.No abstract available
[Doppler ultrasound measurement of the cardiac volume of the horse].
Tierarztliche Praxis. Supplement    January 1, 1993   31 
Stadler P, Kinkel N, Deegen E.No abstract available
Naturally occurring selenosis in Wyoming. Raisbeck MF, Dahl ER, Sanchez DA, Belden EL, O'Toole D.A review of Wyoming State Veterinary Laboratory records for 1947-1987 revealed no substantiated cases of naturally occurring selenosis. However, older reports attributed thousands of animal deaths to selenium each year in this area. Beginning in August 1988, cases of suspected selenosis and selenium deficiency were solicited from veterinarians and producers by announcements in various statewide livestock publications. As of August 1991, 4 cases (all horses) of naturally occurring selenosis have been confirmed. Clinical signs were most often referable to epithelial damage, e.g., hoof lesions an...
Large granular lymphocyte leukemia in a horse.
Veterinary clinical pathology    January 1, 1993   Volume 22, Issue 4 126-128 doi: 10.1111/j.1939-165x.1993.tb00668.x
Kramer J, Tornquist S, Erfle J, Sloeojan G.Large granular lymphocytes (LGL) occur as a leukemic or aleukemic neoplasia in humans,(1) rats,(2) cats,(3,4) dogs,(5) and horses.(6) The single case of equine LGL previously reported was aleukemic.(5) In contrast to this previous report of aleukemic equine LGL neoplasia, the leukemia in the case presented here established the antemortem diagnosis of LGL.
The effect of starting time on dexamethasone suppression test results in horses.
Domestic animal endocrinology    January 1, 1993   Volume 10, Issue 1 1-5 doi: 10.1016/0739-7240(93)90002-s
Sojka JE, Johnson MA, Bottoms GD.This study was conducted to investigate the effect of starting time on dexamethasone suppression test results in horses. Eight adult horses were used throughout the trial. Baseline cortisol levels were established by collecting cortisol levels twice daily, at 8:00 A.M. and 8:00 P.M. for 4 consecutive days. Morning baseline cortisol levels were 46.3 +/- 5.94 ng/ml, and evening baseline cortisol levels were 32.8 +/- 5.59 ng/ml. Although lower, the evening cortisol levels were not statistically different (P = 0.154) from the morning levels. Dexamethasone suppression tests initiated at either 9:00...
Haemagglutination-inhibiting antibodies against African horse sickness virus in domestic animals in Nigeria.
Veterinary research    January 1, 1993   Volume 24, Issue 6 483-487 
Baba SS, Olaleye OD, Ayanbadejo OA.A sero-epidemiological survey of African horse sickness (AHS) virus in 261 animals which included 96 camels, 81 horses, 80 dogs and 4 donkeys was carried out in Nigeria. The animals had no history of vaccination against AHS. Sera were tested by the haemagglutination-inhibition (HI) test for the presence of antibody against AHS virus. Of these, 77 (95.1%) horse, 4 (100%) donkey, 10 (10.4%) camel and 28 (35%) dog sera samples tested were recorded as positive. The prevalence of antibody in samples taken from horses in different regions was similar. The prevalence of antibody to AHS virus detected...
[The importance of Lyme borreliosis in veterinary medicine].
Glas. Srpska akademija nauka i umetnosti. Odeljenje medicinskih nauka    January 1, 1993   Issue 43 277-285 
Popović N, Djuricić B, Valcić M.A study of literature concerning Lyme borreliosis related to animals was done. In the research work the epidemiology, pathogenesis, diagnosis and treatment of horses, cattle and dogs affected with Lyme borreliosis have been discussed. The clinical signs of Lyme borreliosis in horses are: chronic weight loss, sporadic lameness, laminitis, low grade fever, swollen joints, muscle tenderness and anterior uvetitis. In addition to these clinical sings, neurological sings such as depression, behavioral changes, dysphagia and encephalitis can be seen in chronic cases. Cattle affected with acute Lyme b...
Qualitative and morphometric radiographic findings in the distal phalanx and digital soft tissues of sound thoroughbred racehorses.
American journal of veterinary research    January 1, 1993   Volume 54, Issue 1 38-51 
Linford RL, O'Brien TR, Trout DR.Lameness examinations and radiography of the distal phalanx and associated soft-tissue structures of the front feet of 103 Thoroughbred racehorses, 4 to 9 years old, were performed to determine normal radiographic appearance and morphometry. Of 103 horses examined, 41 were used in the study that were without clinical signs of foot problems or lameness, had raced at least twice prior to radiography, and had raced at least twice more in the 6 months after radiography. Lateromedial and dorsoproximal-palmarodistal radiographic views of each front distal phalanx were used to measure 28 bone and sof...
Analgesic effects of detomidine in thoroughbred horses with chronic tendon injury.
Research in veterinary science    January 1, 1993   Volume 54, Issue 1 52-56 doi: 10.1016/0034-5288(93)90010-d
Chambers JP, Livingston A, Waterman AE, Goodship AE.This study was undertaken to assess the analgesia provided by detomidine (20 micrograms kg-1 intravenously) in thoroughbred horses. Pain thresholds to a mechanical noxious stimulus were measured before and after a period of mild chronic pain in one foreleg. Detomidine was a good analgesic in control animals; their pain thresholds were significantly elevated for about 60 minutes. After injury, the injured leg had a significantly lower pain threshold and the intensity and duration of analgesia provided by detomidine were significantly reduced. The analgesia in the opposite (sound) leg was also r...
Efficacy of equine influenza vaccines for protection against A/Equine/Jilin/89 (H3N8)–a new equine influenza virus.
Vaccine    January 1, 1993   Volume 11, Issue 10 987-993 doi: 10.1016/0264-410x(93)90122-e
Webster RG, Thomas TL.A new H3N8 equine influenza virus [A/Equine/Jilin/1/89 (Eq/Jilin)] appeared in Northeastern China in 1989 and caused high mortality in horses; the available evidence indicates that it has not yet spread outside this region of the world. Serological analysis with postinfection ferret sera in haemagglutination inhibition (HI) tests confirmed that Eq/Jilin is antigenically distinct from H3N8 equine influenza viruses isolated between 1963 and 1991 and also showed that a current equine influenza virus [A/Equine/Alaska/1/91 (H3N8)] had undergone antigenic drift. In the present study we determine if ...
Localization of the horse (Equus caballus) alpha-globin gene complex to chromosome 13 by fluorescence in situ hybridization.
Cytogenetics and cell genetics    January 1, 1993   Volume 62, Issue 2-3 136-138 doi: 10.1159/000133456
Oakenfull EA, Buckle VJ, Clegg JB.The alpha-globin gene complex in Equus caballus has been mapped by fluorescence in situ hybridization to the telomeric region of the long arm of chromosome 13. This is the first equine gene to be mapped to this chromosome.
Segmental ischemic necrosis of the small intestine in two postparturient mares.
Journal of the American Veterinary Medical Association    January 1, 1993   Volume 202, Issue 1 101-103 
Zamos DT, Ford TS, Cohen ND, Crossland LE.Two mares developed segmental ischemic necrosis of the small intestine after parturition. In one mare, the mesentery of the small intestine apparently tore during parturition, after which necrosis developed in a 52-cm segment of the distal portion of jejunum. In the other mare, a 52-cm segment of the proximal portion of ileum tore during parturition. Three weeks later, a 40-cm segment of the distal portion of jejunum became incarcerated in the mesenteric rent and twisted 360 degrees on its mesentery. Both mares recovered after resection of affected intestine and are functioning as broodmares.
Pathogenic studies and antigenic and sequence comparisons of A/equine/Alaska/1/91 (H3N8) influenza virus. Alstad AD, Sahu SP, Pedersen DD, Saari DA, Kawaoka Y, Webster RG.An influenza virus, A/equine/Alaska/1/91 (H3N8), was isolated from horses from Alaska with an acute respiratory infection. Pathogenic and serologic studies revealed that this virus is similar to previously isolated equine H3N8 influenza viruses. Antigenic analyses utilizing hemagglutination inhibition and neuraminidase inhibition assays indicated an antigenic drift from the prototype equine H3N8 influenza virus, A/equine/Miami/1/63. Partial sequence analysis of the A/equine/Alaska influenza virus indicated that each of 8 gene sequences are of equine origin.
[Ultrasound guidance of transvaginal follicle puncture in the mare].
Tierarztliche Praxis. Supplement    January 1, 1993   61-62 
Wolff N, Feigl H, Hollerrieder J.No abstract available
Pinealitis accompanying equine recurrent uveitis.
The British journal of ophthalmology    January 1, 1993   Volume 77, Issue 1 46-48 doi: 10.1136/bjo.77.1.46
Kalsow CM, Dwyer AE, Smith AW, Nifong TP.There is no direct verification of pineal gland involvement in human uveitis. Specimens of pineal tissue are not available during active uveitis in human patients. Naturally occurring uveitis in horses gives us an opportunity to examine tissues during active ocular inflammation. We examined the pineal gland of a horse that was killed because it had become blind during an episode of uveitis. The clinical history and histopathology of the eyes were consistent with post-leptospiral equine recurrent uveitis. The pineal gland of this horse had significant inflammatory infiltration consisting mainly...
Clinical biochemical determinations in the Mangalarga-Paulista horse: reference values.
Acta veterinaria Hungarica    January 1, 1993   Volume 41, Issue 1-2 151-158 
Novelli EL, Rodrigues NL, Chiacchio SB.Biochemical values are widely related with environmental agents, sex and age, and are used in disease diagnosis. Numerous reports have been published on the biochemical parameters of different breeds of horses. However, there is a paucity of information concerning Cu-Zn superoxide dismutase (SOD), ceruloplasmin, copper and zinc determinations in the serum. Blood samples from a total of 60 horses of the Mangalarga-Paulista breed, representing three age groups (0 to 4 months old, 6 to 18 months old and adult) were examined. Male horses have a higher mean value of SOD, ceruloplasmin and copper th...
Eastern equine encephalitis virus in Ohio during 1991.
Journal of medical entomology    January 1, 1993   Volume 30, Issue 1 217-222 doi: 10.1093/jmedent/30.1.217
Nasci RS, Berry RL, Restifo RA, Parsons MA, Smith GC, Martin DA.During August and September of 1991, an epizootic of eastern equine encephalitis (EEE) virus in horses occurred in Wayne and Holmes countries, OH. This was the first recorded epizootic of EEE virus in the state. Twelve horses were confirmed positive for EEE virus through virus isolation or seroconversion, and seven additional horses with compatible symptoms were in close spatial and temporal proximity to the confirmed cases and were presumed to have died from EEE virus. The outbreak was centered around the Killbuck Wildlife Area, a 2,147-ha tract maintained by the state, half of which consists...
Turbidity of hyperimmune equine antivenom: the role of phenol and serum lipoproteins.
Toxicon : official journal of the International Society on Toxinology    January 1, 1993   Volume 31, Issue 1 61-66 doi: 10.1016/0041-0101(93)90357-o
Rojas G, Vargas M, Robles A, Gutiérrez JM.Twenty batches of polyvalent antivenom produced at the Instituto Clodomiro Picado were analyzed for turbidity, both before and after freezing-thawing and lyophilization. Eight batches became turbid upon freezing-thawing, and this change correlated with high levels of cholesterol, triglycerides and lipoproteins, especially beta-lipoprotein. Since normal horse serum does not become turbid after freezing-thawing, despite the fact that it has high lipoprotein levels, the possibility was raised that phenol, used as a preservative during serum fractionation, might affect lipoproteins, inducing the a...
Immunochemical studies of equine chorionic gonadotropin (eCG), eCG alpha, and eCG beta.
Endocrinology    January 1, 1993   Volume 132, Issue 1 205-211 doi: 10.1210/endo.132.1.7678214
Couture L, Lemonnier JP, Troalen F, Roser JF, Bousfield GR, Bellet D, Bidart JM.The equine (e) placental glycoprotein hormone eCG plays a critical though not completely understood role during the first trimester of gestation in mares. In the present work, we have developed immunoradiometric assays (m-IRMAs) for detection of eCG, eCG alpha, and eCG beta using combinations of monoclonal antibodies (mAbs) specific for epitopes that reside on free and/or combined subunits. The free eCG alpha m-IRMA was based on AHT20 mAb, specific for the free alpha-subunit of all species, and 125I-labeled ECG01 mAb, which recognizes both free and combined alpha-subunit from equine and primat...
Changes in cross-sectional area and capillary supply of the muscle fiber population in equine gluteus medius muscle as a function of sampling depth.
American journal of veterinary research    January 1, 1993   Volume 54, Issue 1 32-37 
Rivero JL, Serrano AL, Diz AM, Morales JL.The right and left gluteus medius muscles of 4 mature Andalusian stallions were examined by repeated needle biopsy over a specific area and depth, as well as at different depths, to determine whether the cross-sectional area and capillary supply of the various fiber types are homogeneous throughout the muscle. The muscle biopsy specimens were histochemically analyzed for fiber types (myofibrillar adenosine triphosphatase) and capillaries (amylase-periodic acid-Schiff method). Differences between contralateral sites were not identifiable for any of the analyzed variables. Differences between sa...