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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.
Benzimidazole resistance in equine strongyles: association with clinical disease.
The Veterinary record    June 29, 1991   Volume 128, Issue 26 613-614 doi: 10.1136/vr.128.26.613
Mair TS, Cripps PJ.No abstract available
Investigations into the use of exogenous oxytocin for promoting uterine drainage in mares susceptible to endometritis.
The Veterinary record    June 22, 1991   Volume 128, Issue 25 593-594 doi: 10.1136/vr.128.25.593
Allen WE.No abstract available
Intervertebral disk prolapse and diskospondylitis in a horse.
Journal of the American Veterinary Medical Association    June 15, 1991   Volume 198, Issue 12 2095-2096 
Furr MO, Anver M, Wise M.Intervertebral disk prolapse was diagnosed in a mature horse with clinical signs of caudal ataxia. Radiography and myelography demonstrated a collapsed intervertebral space and loss of the dorsal and ventral dye columns. Results of CSF analysis were normal, as were a CBC and serum biochemical profile. High CSF WBC count and high CSF creatine kinase activity were noticed following acute neurologic deterioration. While common in certain breeds of dogs, intervertebral disk prolapse is rarely reported in horses. It should be considered in the differential diagnosis of horses with caudal ataxia.
Resection of a cervical tracheal bronchus in a foal.
Journal of the American Veterinary Medical Association    June 15, 1991   Volume 198, Issue 12 2097-2099 
Davis DM, Honnas CM, Hedlund CS, Schneiter HL.A 3-day-old Thoroughbred foal developed a large, air-distended, midcervical swelling that was diagnosed as a congenital tracheal bronchus with associated ectopic lung tissue. Clinical signs consisted of a compressible air-filled sac that enveloped the trachea. The nature and extent of the defect were evaluated endoscopically and radiographically. Surgical resection of the bronchus and associated air-filled sac resulted in a functionally and cosmetically acceptable outcome.
Comparison between diagnostic ultrasonography and radiography in the evaluation of horses and cattle with thoracic disease: 56 cases (1984-1985).
Journal of the American Veterinary Medical Association    June 15, 1991   Volume 198, Issue 12 2112-2118 
Reef VB, Boy MG, Reid CF, Elser A.The results of radiography and ultrasonography were compared on 56 horses and cows with lower respiratory tract disease. Ultrasonography was more sensitive than radiography for the detection of small pleural effusions and consolidations in large animals. The side of the thorax affected and the character of the pleural fluid and lung in large animals with pleural effusion can be evaluated ultrasonographically. The periphery of the lung must be affected to characterize pulmonary lesions ultrasonographically. Radiography is the best technique to characterize lesions deep within the lung when the ...
Amputation of the tail of a horse as the basis for a malpractice suit.
Journal of the American Veterinary Medical Association    June 15, 1991   Volume 198, Issue 12 2056-2058 
Lewis RW.No abstract available
New influenza virus in horses.
Nature    June 13, 1991   Volume 351, Issue 6327 527 doi: 10.1038/351527a0
Webster RG, Guo YJ.No abstract available
Responses of cortisol and prolactin to sexual excitement and stress in stallions and geldings.
Journal of animal science    June 11, 1991   Volume 69, Issue 6 2556-2562 doi: 10.2527/1991.6962556x
Colborn DR, Thompson DL, Roth TL, Capehart JS, White KL.Sexual stimulation induces rapid secretion of cortisol and prolactin (PRL) in stallions. Experiment 1 was designated to determine whether stallions associated location and(or) procedure with previous sexual stimulation in that location. After a control period on d 1, four stallions were exposed to an estrous mare for 5 min on d 2. On d 3, 4, 5, and 6, the same procedure was followed with no mare present. Concentrations of PRL and cortisol increased (P less than .05) after mare exposure on d 2 but did not vary (P greater than .05) on d 1, 3, 4, 5, or 6. In Exp. 2, six stallions were used to det...
Comparison of the efficacy of ivermectin, oxibendazole, and pyrantel pamoate against 28-day Parascaris equorum larvae in the intestine of pony foals.
Journal of the American Veterinary Medical Association    June 11, 1991   Volume 198, Issue 11 1946-1949 
Austin SM, DiPietro JA, Foreman JH, Baker GJ, Todd KS.Sixteen helminth-free pony foals were inoculated with a mean (+/- SD) 2,000 (+/- 545.5) infective Parascaris equorum eggs (day 0). Foals were allocated to replicates of 4, and treatments within each replicate were assigned at random. Treatment administered on postinoculation day (PID) 28 included no treatment (control), 0.2 mg of ivermectin/kg of body weight, 10 mg of oxibendazole/kg, or 6.6 mg of pyrantel base (pamoate)/kg. Paste formulations of the anthelmintics were administered orally. The foals were euthanatized 14 days after treatment (PID 42) and examined for P equorum larvae in the sma...
Evaluation of the oral vitamin E absorption test in horses.
American journal of veterinary research    June 1, 1991   Volume 52, Issue 6 912-916 
Craig AM, Blythe LL, Rowe KE, Lassen ED, Walker LL.An oral vitamin E absorption test used in human beings was modified for use in horses. The most appropriate techniques with which to measure gastrointestinal tract absorption of vitamin E (alpha-tocopherol) in horses were developed. Vitamin E was administered orally, and serum values of alpha-tocopherol were measured by use of high-performance liquid chromatography at 0, 3, 6, 9, 12, and 24 hours after vitamin E administration. Variables included comparison of 2 dosages (45 and 90 IU/kg of body weight), routes of administration, and absorption dynamics of 3 preparations of dl-alpha-tocopherol....
Quantitative buffy coat analysis related to adrenocortical function in horses during a three-day event competition.
Zentralblatt fur Veterinarmedizin. Reihe A    June 1, 1991   Volume 38, Issue 5 376-382 doi: 10.1111/j.1439-0442.1991.tb01024.x
Linden A, Art T, Amory H, Massart AM, Burvenich C, Lekeux P.This study was carried out to investigate stress induced in a cross-country by measuring plasma cortisol and to compare the changes in cortisol level with the leucocytic changes measured with the quantitative buffy coat (QBC) analysis, which is a new method applicable in field conditions for the evaluation of haematological parameters in horses. Seven healthy horses competing in a national three-day event were investigated. Venous blood was sampled under resting condition, 2 min and 180 min after the completion of the cross-country and analysed for haematological parameters, plasma cortisol, p...
Factors involved in the balancing of equine hooves.
Journal of the American Veterinary Medical Association    June 1, 1991   Volume 198, Issue 11 1980-1989 
Balch O, White K, Butler D.No abstract available
Molluscum contagiosum in a horse.
Journal of the South African Veterinary Association    June 1, 1991   Volume 62, Issue 2 72-74 
Van Rensburg IB, Collett MG, Ronen N, Gerdes T.An adult stallion presented with a severe papular dermatitis of especially the neck, chest and genitalia. A marked scrotal oedema was present. Histopathological examination of skin biopsies, revealed the presence of numerous intracytoplasmic molluscum bodies in areas of focal epidermal hyperplasia. Electron microscopical examination showed the presence of typical pox virions in affected epidermal cells. Attempts at viral isolation were unsuccessful. This is believed to be the first reported case of molluscum contagiosum in a horse in the Republic of South Africa.
[Detection of bovine papillomavirus DNA in equine sarcoids using the polymerase chain reaction (PCR)].
Berliner und Munchener tierarztliche Wochenschrift    June 1, 1991   Volume 104, Issue 6 185-187 
Teifke JP, Weiss E.Unfixed and formalin-fixed frozen sections and paraffin-sections of histopathologically confirmed sarcoids of 20 horses were studied in the PCR. The used set of primers was located in the E5 open reading frame fitting both to bovine papillomavirus 1 (BPV-1) and BPV-2. Independent of the quality of the used tissues BPV-DNA was detected in all 20 sarcoids. By cleaving with restriction endonuclease Bst XI it was shown that the DNA-sequences amplified by PCR were identical with that of BPV-1. The results support the general view that BPV play an important role in equine sarcoids.
[The microscopic and functional anatomy of the ileal papilla (papilla ilealis) and the cecocolic valve (valva caecocolia) and the pelvic flexure (flexura pelvina) of the horse (Equus caballus)].
Anatomia, histologia, embryologia    June 1, 1991   Volume 20, Issue 2 180-188 doi: 10.1111/j.1439-0264.1991.tb00757.x
Roger T, Cabanie P.The histologic study on six horses of the ileo-caecal and caeco-colic junctions confirms their sphincteral structure. It appears that the activity of the muscular fibres, identified in the ileo-caecal and caeco-colic plica, modulates the curvature of the junctions and thus, blocks, as sphincters, the reflux of contents from the caecum into the ileum and from the colon into the caecum. But on the other hand, the pelvic flexure does not possess any microscopic organization to stop the reflux of contents from the dorsal colon into the ventral colon.
Enantioselective N-demethylation of ketamine in the horse.
Journal of veterinary pharmacology and therapeutics    June 1, 1991   Volume 14, Issue 2 209-212 doi: 10.1111/j.1365-2885.1991.tb00825.x
Delatour P, Jaussaud P, Courtot D, Fau D.No abstract available
Cosmetic repair of a facial deformity by use of a silicone implant in a horse.
Journal of the American Veterinary Medical Association    June 1, 1991   Volume 198, Issue 11 1957-1958 
Bohanon TC, Gabel AA.A heat-vulcanized silicone implant was used for cosmetic repair of a facial deformity in a horse. The deformity had resulted from fracture of the frontal bone into the frontal sinus 6 months earlier. Normal facial contour was restored by suturing the sculpted implant to the periosteum over the defect. Results 1 year after surgery were excellent.
Two-dimensional echocardiographically guided pericardiocentesis in a horse with traumatic pericarditis.
Journal of the American Veterinary Medical Association    June 1, 1991   Volume 198, Issue 11 1953-1956 
Vörös K, Felkai C, Szilágyi Z, Papp A.Two-dimensional echocardiographic (2DE) examination was performed on a horse with clinical signs of pericardial effusion. Thickening of the pericardium, excess amount of pericardial fluid, elevation of the cardiac apex, and right ventricular compression, characteristic of cardiac tamponade, could be seen on 2DE recordings. Fibrinous pericarditis was suspected by observation of fibrinous strands in the pericardial fluid and epicardial fibrin deposits. Echocardiographically guided pericardiocentesis was performed, and 4 L of fluid was removed from the pericardial sac. Streptococcus zooepidemicus...
Ventilatory compensation for lactacidosis in ponies: role of carotid chemoreceptors and lung afferents.
Journal of applied physiology (Bethesda, Md. : 1985)    June 1, 1991   Volume 70, Issue 6 2619-2626 doi: 10.1152/jappl.1991.70.6.2619
Erickson BK, Forster HV, Pan LG, Lowry TF, Brown DR, Forster MA, Forster AL.We investigated changes in arterial PCO2 (PaCO2) and pulmonary ventilation (VE) in normal, carotid chemoreceptor-denervated, and hilar nerve-denervated ponies during intravenous lactic acid infusion at rest and treadmill exercise at 1.8 mph-5% grade (mild) and 1.8 mph-15% grade (moderate). Lactic acid, (0.5 M) infusion of 0.10, 0.13, and 0.20 ml.min-1.kg-1 at rest and mild and moderate exercise increased arterial [H+] linearly throughout the 10 min of acid infusion. At 10 min of infusion, arterial [H+] had increased approximately 20 nmol/l (0.2 pH units) for each condition and group. Under mos...
Concentrations of fumonisin B1 in feeds associated with animal health problems.
Mycopathologia    June 1, 1991   Volume 114, Issue 3 129-135 doi: 10.1007/BF00437200
Ross PF, Rice LG, Plattner RD, Osweiler GD, Wilson TM, Owens DL, Nelson HA, Richard JL.Ninety-eight samples of feeds associated with 44 cases of equine leukoencephalomalacia (ELEM) and 83 samples of feed associated with 42 cases of a porcine pulmonary edema syndrome (PPE) were analyzed for fumonisin B1 (FB1). For comparison purposes, 51 feed samples not associated with PPE or ELEM were also analyzed. Feed associated with ELEM contained FB1 ranging from less than 1 microgram/g to 126 micrograms/g with 75% of the cases having at least 1 sample above 10 micrograms/g. Feeds associated with PPE ranged from less than 1 microgram/g to 330 micrograms/g with 71% of the cases having at le...
Eltenac, a new anti-inflammatory and analgesic drug for horses: clinical aspects.
Journal of veterinary pharmacology and therapeutics    June 1, 1991   Volume 14, Issue 2 193-199 doi: 10.1111/j.1365-2885.1991.tb00822.x
Prügner W, Huber R, Lühmann R.Two controlled studies to determine efficacy in the horse were performed with eltenac, a new injectable, non-steroidal anti-inflammatory drug (NSAID). Clinical trials were carried out with a dose rate of 1 mg/kg body weight in a randomized, placebo-controlled, double-blind design to assess therapeutic efficacy in acute inflammatory disorders and in animals with orthopaedic conditions. In a preliminary pharmacokinetic investigation in six horses mean elimination half-life was 1.7 h after i.v. administration. In the first clinical study, analgesic activity on pain-related lameness was determined...
[Pilot study of the relationship of free amino acids in serum and in the cerebrospinal fluid of horses].
Tierarztliche Praxis    June 1, 1991   Volume 19, Issue 3 271-275 
Grabner A, Goldberg M.In a blind study serum and cerebrospinal fluid (CSF) of control horses and of horses in hepatic coma after chronic food intoxication with Senecio alpinus were collected simultaneously and the composition of free amino acids was determined. The hepatic encephalopathy index in serum (less than 1.65) and in CSF (less than 1.11) of liver patients was distinctly less than to the control values in serum (greater than 2.42) and in CSF (greater than 1.49). The serum concentrations of glutamic acid in hepatic coma were elevated five-fold in comparison to the controls. An indication of ammonia decontami...
Comparative determination of selenium in the serum of various animal species and humans by means of electrothermal atomic absorption spectrometry.
Journal of trace elements and electrolytes in health and disease    June 1, 1991   Volume 5, Issue 2 101-113 
Forrer R, Gautschi K, Lutz H.It was the goal of this paper to establish total selenium reference values for Switzerland in different animal species and in humans. To this purpose, a flameless atomic absorption method with deuterium background compensation utilizing a graphite furnace atomization system with a pyrolytic platform inside and palladium solution as matrix modifier was developed for the measurement of selenium in serum. The method was characterized by rapid performability, small sample requirement, acceptable detection limit (0.04 mumol/L) and precision and a linear range of measurement up to 4 mumol/L. The met...
Effects of intra-articular administration of dimethylsulfoxide on chemically induced synovitis in immature horses.
American journal of veterinary research    June 1, 1991   Volume 52, Issue 6 934-939 
Welch RD, Watkins JP, DeBowes RM, Leipold HW.The effects of intra-articular administration of dimethylsulfoxide (DMSO) on chemically induced synovitis in the middle carpal joint of 6 weanling horses were evaluated. Following aseptic collection of synovial fluid, the middle carpal joint of each forelimb was injected with 50 mg of Na-monoiodoacetate to induce synovitis. Eight days after injection, synovial fluid was obtained and the right middle carpal joints were injected with 2 ml of 40% DMSO in lactated Ringer solution. The corresponding joints of the left limb (control) were injected with 2 ml of lactated Ringer solution. Sampling and ...
Frequency and severity of osteochondrosis in horses with cervical stenotic myelopathy.
American journal of veterinary research    June 1, 1991   Volume 52, Issue 6 873-879 
Stewart RH, Reed SM, Weisbrode SE.We compared the frequency and severity of osteochondrosis lesions in young Thoroughbred horses with cervical stenotic myelopathy (CSM) vs that in clinically normal Thoroughbreds of the same age. All lesions of the cervical vertebrae and appendicular skeleton were classified histologically as osteochondrosis or nonosteochondrosis and were measured for severity. Minimal sagittal diameter was significantly smaller in horses with CSM from C2 through C6; no difference was detected at C7. Severity of cervical vertebral osteochondrosis was greater in the horses with CSM, however frequency was not dif...
The identification of hepatotoxic pyrrolizidine alkaloid exposure in horses by the demonstration of sulphur-bound pyrrolic metabolites on their hemoglobin.
Veterinary and human toxicology    June 1, 1991   Volume 33, Issue 3 286-287 
Seawright AA, Hrdlicka J, Wright JD, Kerr DR, Mattocks AR, Jukes R.No abstract available
Molluscum contagiosum in three horses.
Journal of the South African Veterinary Association    June 1, 1991   Volume 62, Issue 2 68-71 
Lange L, Marett S, Maree C, Gerdes T.Suspected molluscum contagiosum was diagnosed in 3 horses in the Chingola district of Zambia. The horses were found to be suffering from a slow progressive skin disease with lesions on the chest, shoulders, inner and lateral aspects of the fore- and hindlimbs, the face, fetlocks, pasterns and on the lateral surfaces of the body. The lesions varied from 4 to 20mm in diameter, were hairless but covered by soft keratin projections which, when removed, left a raw elevated base tightly adherent to the epidermis. These lesions bled profusely when the animals were groomed. Older lesions were well cir...
Disposition of human drug preparations in the horse. I. Rectally administered indomethacin.
Journal of veterinary pharmacology and therapeutics    June 1, 1991   Volume 14, Issue 2 145-149 doi: 10.1111/j.1365-2885.1991.tb00816.x
Delbeke FT, Debackere M, Vynckier L.A high-performance liquid chromatographic method to measure urinary indomethacin levels is described. In 0.5 ml urine, 1 micrograms/ml of indomethacin could be detected. Alkaline hydrolysis of urine resulted in the decomposition of indomethacin. When two suppositories of Indocid corresponding to 200 mg indomethacin were administered rectally to four horses the drug was rapidly absorbed and remained detectable in urine from 1 to 12 h. The excretion rate peaked after 2-3 h while the maximal concentration ranged from 18.5 to 80.6 micrograms/ml. Only 8 to 16% of the indomethacin dose was eliminate...
[Immunopathogenesis of Borna disease].
Tierarztliche Praxis    June 1, 1991   Volume 19, Issue 3 267-270 
Stitz L, Richt JA, Rott R.An overview of the pathogenesis of Borna disease (BD) in rats as a model for the naturally occurring infection in horses and sheep is presented. Our findings revealed a virus infection in which a virus-specific T cell-mediated immune response leads to disease. The immune cells capable of mediating this immunopathological reaction were defined as helper/inducer T cells. In all, the described observations indicate that CD4+ T cells and macrophages trigger a delayed-type hypersensitivity reaction and cause BD together with other cells of the immune system.
The ammonia tolerance test in horses.
Journal of the South African Veterinary Association    June 1, 1991   Volume 62, Issue 2 48-50 
Van den Berg JS.Clinically normal horses (n = 8) with ages ranging from 5 to 8 years, were starved for 12 h and their plasma ammonia concentrations were measured. The mean fasting plasma ammonia concentration was 17.8 +/- 3.8 mumol l-1. After dosing ammonium chloride at a dose rate of 0.02 g kg-1, there was a significant increase in plasma ammonia concentration, with a maximum rise after 20 min (P less than 0.05). To investigate the influence of temperature on plasma ammonia concentrations of stored samples, 8 plasma samples were stored at -20 degrees C and 4 degrees C respectively. The plasma ammonia concent...