Nasal granuloma caused by Pseudallescheria boydii     

J C Brearley  I A McCandlish  M Sullivan  C O Dawson 《Equine veterinary journal》1986,18(2):151-153

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Maedi-visna virus infection in commercial flocks of indigenous sheep in Britain     

G C Pritchard  J B Spence  M J Arthur  M Dawson 《The Veterinary record》1984,115(17):427-429

The recent identification of maedi-visna virus infection in three commercial flocks of indigenous sheep in Britain is described. In one flock the evidence suggested that overt clinical disease was present. The implications of the findings are discussed.  相似文献   

Influence of fiber form in a complete mixed ration on incidence of left displaced abomasum in postpartum dairy cows.     

L J Dawson  E P Aalseth  L E Rice  G D Adams 《Journal of the American Veterinary Medical Association》1992,200(12):1989-1992

During the fall of 1982, increased incidence of left displaced abomasum (LDA) was seen in a group of cows fed a complete pelleted ration (3/16 inch) at the university's dairy center during the early postpartum period. Of these, 17.4% developed LDA when fed this experimental ration, whereas only 1.6% of the remaining cows in the herd developed LDA. The latter cows (as a control) were fed loose alfalfa hay, sorghum silage, and an 18% crude protein mix. Most of the fiber in the experimental diet or pelleted diet was alfalfa hay (30% as-fed basis) that was ground through a quarter-inch screen for incorporation into the pellet. Another 10% of the dietary fiber was contributed by cottonseed hulls. Thus, increased incidence of LDA may be associated with short length of the dietary fiber in the pelleted form.  相似文献   

Effect of feeding frequency on forage fiber and nitrogen utilization in sheep     

L D Bunting  M D Howard  R B Muntifering  K A Dawson  J A Boling 《Journal of animal science》1987,64(4):1170-1177

Four crossbred wether lambs (38 kg) with permanent ruminal and abomasal cannulae were used in a 4 X 4 Latin square arrangement of treatments to determine the effect of feeding frequency (FF) on forage fiber and N utilization. Lambs were offered 900 g of good quality (vegetative) Kentucky-31 tall fescue hay in equal portions either 2, 4, 8 or 16 times daily. Water consumption increased (P less than .05; linear) with increased FF. Apparent total tract digestibilities of dry matter, organic matter and cell wall constituents were not affected (P greater than .05) by FF, but apparent total tract digestibility of crude protein decreased (P less than .05; linear) with increased FF. Ruminal and post-ruminal digestion of acid detergent fiber (percent of total tract digestion) differed (P less than .05; cubic) among FF treatments. Although N retention was not affected (P greater than .05) by FF, increased FF decreased (P less than .05; linear) mean ruminal ammonia-N concentrations. Both the quantity of total N reaching the abomasum and the efficiency of microbial crude protein synthesis tended to increase (P greater than .05) with increased FF. In addition, the daily quantity of microbial N reaching the abomasum was affected (P less than .05; cubic) by FF. Ruminal pH was not affected (P greater than .05) by FF, whereas total volatile fatty acid concentrations (VFA) decreased (P less than .05; linear) with increased FF. Responses in molar proportions of individual VFA to FF were variable, and suggest that increasing FF elicits significant changes in the distribution of fermentation end-products.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Hydrops foetalis in dwarf calves associated with twinning     

PAW HARPER  MR LATTER  JF WILKINS 《Australian veterinary journal》1995,72(6):236-238

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Paroxysmal atrial fibrillation: A case report     

Michael S. Miller MS  VMD  Kenneth E. Gertsen DVM  Howard Dawson DVM 《Journal of Equine Veterinary Science》1987,7(2)

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Influence of chemotactic agents on the locomotion of equine polymorphonuclear and mononuclear leucocytes     

A D Sedgwick  J Dawson  P Lees 《Research in veterinary science》1987,43(1):55-58

Subpopulations of equine leucocytes, polymorphonuclear and mononuclear cells, were separated from whole blood on a discontinuous Percoll gradient and used in studies of chemokinesis and chemotaxis. Polymorphonuclear cells responded to the chemo-attractant properties of zymosan-activated plasma in Boyden chamber and agarose microdroplet assays but they responded only slightly (Boyden chamber) or not at all (agarose microdroplet) to the peptide N-formyl-methionyl-leucyl-phenylalanine (FMLP). Equine mononuclear cell movement was increased by FMLP in both assay systems and these cells also responded to zymosan activated plasma in the Boyden chamber assay but not in the agarose microdroplet. It is concluded that factors controlling equine polymorphonuclear and mononuclear cell movements into inflammatory exudates may differ.  相似文献   

Bovine spongiform encephalopathy: detection of fibrils in the central nervous system is not affected by autolysis     

A.C. Scott  G.A.H. Wells  M.J. Chaplin  M. Dawson 《Research in veterinary science》1992,52(3):823-336

The effect of autolysis on the electron microscopic detection of the characteristic abnormal fibrils, originally called 'scrapie-associated fibrils', was investigated in four different areas of the central nervous system (CNS) from 10 clinically suspect BSE cattle after post mortem delay and compared with the histopathological diagnosis. The tissues for fibril detection were subjected to controlled incubations to simulate autolysis. Fibril detection in all areas sampled from nine animals in which BSE was confirmed by histopathology was not affected by combined post mortem delays and specific controlled treatments. Detection of fibrils from the cervical spinal cord was no less sensitive than from brain areas. Fibrils were not detected in the one suspect case in which histopathology did not reveal lesions of BSE. The study confirms that fibril detection is of diagnostic value in BSE when post mortem autolysis renders CNS material unsuitable for histopathology.  相似文献   

Serum protein changes in grass sickness     

P Johnson  A M Dawson  D L Mould 《Research in veterinary science》1983,35(2):165-170

Polyacrylamide gel electrophoresis was used to compare serum taken from ponies before and during clinical illness confirmed as grass sickness. A consistent rise in the level of haptoglobin was seen in serum from animals which had shown symptoms for more than two days. Serum albumin was also shown to have altered mobility at the onset of clinical disease. Estimation of the haemoglobin-binding capacity confirmed the haptoglobin increase. This haptoglobin has been purified and some of its properties determined. In contrast to the situation in acute inflammatory conditions no other acute-phase proteins increased to a significant extent in grass sickness. It is concluded that the neurotoxin known to be present in sera of animals experiencing acute grass sickness cannot itself be detected by polyacrylamide gel electrophoresis but may be bound to serum albumin.  相似文献   

The pathology and aetiology of guttural pouch mycosis in the horse   总被引：7，自引：0，他引：7  

W R Cook  R S Campbell  C Dawson 《The Veterinary record》1968,83(17):422-428

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