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Cardiovascular, acid-base, electrolyte, and plasma volume changes in ponies developing alimentary laminitis. Twelve Shetland ponies were fed a high-starch ration. Seven ponies which had a transitory metabolic acidosis developed laminitis 56 hours (+/- 3.5, SEM) after overfeeding. These ponies also developed persistent hypokalemia, hyperthermia, and increased heart rate 24 hours before the onset of lameness. Serum sodium, serum chloride, hematocrit, plasma volume, and blood volume were unchanged. At the onset of clinical signs of laminitis, cardiac output and blood pressure increased, but total peripheral resistance was unchanged. None of the measured or calculated values predicted the onset of lamini...
Biochemical changes in horses during a 50-mile endurance ride. Blood samples were taken from 15 horses before and after a 50-mile ride to examine the changes occurring in some biochemical constituents. There was a significant (P less than 0.05) decrease in plasma potassium, calcium and magnesium concentrations and a rise in inorganic phosphate but there was no alteration in plasma sodium, chloride or protein levels or change in haematocrit. After the ride there was a highly significant (P less than 0.01) fall in blood glucose corresponding with increased lipolysis and a rise in plasma free fatty acids (P less than 0.001) and glycerol (P less than 0.001). ...
Specific reaction of aloe extract with serum proteins of various animals. We found that aloe extract contains a lectin-like substance which reacts with serum proteins of various animals. Furthermore, in human serum 2 proteins, alpha2-macroglobulin and alpha1-antitrypsin, were shown to be reactive with aloe extract.
Radioimmunoassay technique for detecting urinary excretion products after administration of synthetic anabolic steroids to the horse. 1. Cross-bred and thoroughbred geldings were injected with veterinary doses of various synthetic anabolic steroids. Urines collected sequentially from treated animals were analysed, following solvent extraction, by radioimmunoassay using 19-[3H]nortestosterone and an antibody raised against a 19-nortestosterone immunogen. 2. Urinary excretion of 19-nortestosterone and/or its cross-reacting metabolites was detectable for various times after administration of different nortestosterone esters, as follows: phenylpropionate (400 mg), greater than 14 days; cyclohexylpropionate (100 mg), greather tha...
[Strongyloides westeri Ihle, 1917 (Nematoda: Strongyloididae. II. Parasitological and haematological features of experimental infection (author’s transl)]. Experimental infections using 600,000 infective larvae of Strongyloides westeri were carried out in seven worm-free Shetland ponies, four foals and thee yearlings. In the foals, the prepatent period varied from ten to fourteen days, the patent period ranging from forty-three to eighty-three days. Within approximately two months after infection, a decrease in the concentration of haemoglobin and an increase in the beta-globulin fraction of the protein pattern of the serum, practically coinciding with the maximum S. westeri faecal egg counts, were recorded. In the yearlings, the prepatent period...
Serological response in mares affected by contagious equine metritis 1977. A serum agglutination and antiglobulin test is described for the detection of antibodies to the contagious equine metritis organism. A provisional interpretation of the test is proposed and using this interpretation the results of 66 such tests are discussed.
A study of the hearing ability of horses. The ability of 10 horses to hear frequencies between 14 and 25 Kc/s was tested. The horses appeared to perceive ultrasounds by showing either fright reactions or Pryer reflexes to all of the 12 frequencies. The highest frequencies were heard less by older animals, and elicited more reactions in geldings than in mares.
Ameloblastic ondontoma in a foal. A 4 month old foal with right sided maxillary enlargement and considerable upper airway obstruction had an ameloblastic odontoma in the right maxillary sinus. This odontogenic tumour, probably congenital in nature, had extensively distorted the structure and contours of the sinus, and displaced the adjacent turbinates and nasal septum.
Some studies on equine strains of Escherichia coli. A detailed study was made of 194 equine strains of E. coli, involving biochemical and serological characters. In these, the equine strains closely resembled E. coli from other sources, and shared antigenic characters with strains isolated from different animal species.
Splenectomy in the horse. Splenectomy was successfully performed on 2 aged horses to facilitate experimental studies of Babesia equi infection. Resection of part of the 17th rib provided the most acceptable approach and avoided many complications encountered on removing part of the 16th rib.
Neurologic signs and neuropathology associated with a case of equine infectious anemia. Neurologic signs and neuropathologic lesions associated with a case of equine infectious anemia in a 7 year old Quarter-horse mare were studied. Clinical signs included depression, disorientation, circling, knuckling at the fetlock and hypermetria. The neuropathologic lesions were characterized by a granulomatous ependymitis, subependymal encephalitis, choroiditis and hydrocephalus. These lesions were associated with signs of neurologic dysfunction which were the cause of the prominent clinical features.
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