The pathogenesis of enteric colibacillosis in neonatal unsuckled calves.     

G R Pearson  E F Logan 《The Veterinary record》1979,105(8):159-164

The development of pathological lesions in the small intestine of neonatal calves is described. Seven newborn calves were challenged orally with a known enteropathogenic strain of E coli 0101k?(A) and killed at varying times after inoculation. Adhesion of bacteria to the mucosa of the small intestine was observed in all calves. A few organisms were seen in the distal small intestine at three hours after inoculation and thereafter adhesion progressed anteriorly along the intestine in calves killed from six to 36 hours. In these calves pathological changes occurred between six and 12 hours after inoculation. Villi were stunted and thickened and the epithelial surface was irregular. A further calf, anaesthetised from five-and-a-half to 10 hours after inoculation and repeatedly sampled from the distal small intestine, developed similar lesions abruptly at nine hours after inoculation. Villus and crypt lengths in the challenged calves were compared with those in three normal uninoculated control calves.  相似文献   

The behavior of particulate material in the treatment lagoons of a bleached kraft pulp mill     

J. M. Bewers  G. J. Pearson 《Water, air, and soil pollution》1972,1(4):347-358

The effect of treatment lagoons on the suspended particulate matter contained in Bleached Kraft Mill Effluent (B.K.M.E.) has been studied. Good settling characteristics for coarse material (> 10 μm diam) were found, but fine particles (< 1 μm diam) remain in suspension throughout the treatment system. When the treated effluent is discharged into the brackish water of a narrow tidal cove, the increased ionic strength of the medium promotes the combination of fine particles. This flocculation effect produces a larger concentration of coarse material in the treated effluent than was contained in the raw mill discharge. A procedure for artificial flocculation, within the treatment system, is suggested as a method of improving both the treatment efficiency and the physical properties of the effluent released to the marine environment.  相似文献   

A SURVEY OF MYCOBACTERIOSIS OF FERAL PIGS IN THE NORTHERN TERRITORY   总被引：6，自引：0，他引：6  

L. A. Corner  R. H. Barrett†  A. W. D. Lepper  V. Lewis‡  C. W. Pearson † 《Australian veterinary journal》1981,57(12):537-542

Seven hundred and fifty-one feral pigs from the subcoastal plains of the Northern Territory were examined. The sample population consisted of 52.4% females and 47.6% males. They ranged in age from newborn piglets to mature animals of over 72 months. Of the pigs examined 47.7% had macroscopic abscesses and of these 80.2% were probably caused by mycobacteria. Tissues from 193 pigs were examined bacteriologically and 93 strains of mycobacteria were isolated. These were typed as M. bovis (37 strains); M. avium serotype 2 (1); M. intracellulare serotypes 6 (2), 7 (3), 9 (1) and 18 (1); M. intracellulare double serotypes 6 + 12 (1), 8 + 12 (1) and 11 + 25 (1); M. intracellulare unclassified serotype (4); M. scrofulaceum serotype 41 (1); M. scrofulaceum unclassified serotype (7); M. gordonae (2); M. kansasii (1); M. simiae (2); M. szulgai (2); M. vaccae (1); and M. xenopi (2). Additionally, 3 strains were unidentifiable members of the M. avium-M. intracellulare-M. scrofulaceum (MAIS) complex, one strain was a Runyon's group IV and 4 strains were typed as members of the genus Rhodococcus. Five strains were non-viable on subculture and 10 did not conform to any currently recognised species of mycobacteria. Of the 93 strains, 3 were isolated from tissue that did not contain macroscopic lesions, viz. M. simiae, Runyon's group IV and an unidentifiable member of the MAIS complex. It was concluded that the feral pig is probably an end host for both M. bovis and atypical mycobacteria and not a significant source of infection for cattle. M. bovis is not a significant cause of mortality in feral pigs but mycobacterioses are a significant cause of morbidity. With increasing age, the proportion of pigs having lesions increased whereas the proportion of lesions from which mycobacteria could be isolated decreased.  相似文献   

Some behavioural and physiological changes in pregnant goats and sheep during adaptation to laboratory conditions.     

R A Pearson  D J Mellor 《Research in veterinary science》1976,20(2):215-217

Eight goats and 12 sheep were examined during their first six to eight weeks in the laboratory. Plasma corticosteroid concentrations in four untamed goats and four untamed sheep were elevated during the first week but thereafter remained at basal values. In contrast, low corticosteroid concentrations were observed throughout in four tame goats and in four untamed sheep sampled only after they had been in the laboratory for two weeks. Plasma glucose concentrations were elevated during the first week in the untamed goats. In four partially tamed sheep a rise in heart rate which occurred transiently during handling for 4-6 min did not occur when these animals showed tame behaviour after two to three weeks, and in four untamed sheep a rise in plasma corticosteroid concentration, which occurred transiently when seven blood samples were taken in 90 min, did not occur when these sheep were judged to be tame after five to six weeks.  相似文献   

A cross-indexing system for a personal reference file     

L D Pearson 《Journal of the American Veterinary Medical Association》1970,157(3):344-348

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Isolation of Herpesvirus from Equine Leukocytes: Comparison with Equine Rhinopneumonitis Virus   总被引：1，自引：1，他引：0       下载免费PDF全文

L. Kemeny  James E. Pearson 《Canadian journal of veterinary research》1970,34(1):59-65

An agent which possessed the properties of herpesviruses was isolated from the leukocytes of 71 out of 80 (88.7%) apparently normal Iowa horses. It was ether- and heat-sensitive, DNA type, and produced type-A intranuclear inclusion bodies in cell cultures. Electron micrographs revealed a virion of typical herpesvirus structure. Leukocyte isolate virus could be differentiated from equine rhinopneumonitis virus (ERV) by serum neutralization, by growth differences in rabbit kidney cells, and by fluorescent antibody staining. Specific neutralizing antibody against this agent was found in a pooled serum sample from normal horses and in the serums of herpesvirus carrier horses. Serum from a mare inhibited growth of both ERV and leukocyte viral isolates. Normal sheep, calf, and rabbit serum did not neutralize either virus.  相似文献   

Surgery of the male genital tract in cattle: a review of 121 cases     

H Pearson 《The Veterinary record》1972,91(21):498-509

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Clinical and pathologic evaluation of ruptured cranial cruciate ligament repair in the dog     

D M McCurnin  P T Pearson  W M Wass 《American journal of veterinary research》1971,32(10):1517-1524

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THE ROLE OF ZINC SULFATE IN WOUND HEALING     

E.B. Leeds  H.S. Soroff  E. Pearson  C.T. Cloutier  M.S. Schwartz 《Veterinary surgery : VS》1976,5(1):61-62

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Streptococcus agalactiae in dairy heards. Its incidence and relationship to cell count and inhibitory substance levels in bulk milk   总被引：1，自引：0，他引：1  

D O Greer  J K Pearson 《The British veterinary journal》1973,129(6):544-554

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