Characterisation of Pasteurella multocida isolated from fowl cholera outbreaks on turkey farms     

PJ BLACKALL  JL PAHOFF  D MARKS†  N FEGAN  CJ MORROW‡ 《Australian veterinary journal》1995,72(4):135-138

SUMMARY: Biochemical profiles, restriction endonuclease analysis (REA) and ribotyping were used to investigate Pasteurella multocida isolates from outbreaks of fowl cholera on 7 turkey farms in New South Wales. While only a single isolate was available from 5 of the farms, multiple isolates, 4 and 12 respectively, were available from the other 2 farms. The available field evidence suggested that 8 outbreaks had occurred with one farm suffering 2 outbreaks. The isolates obtained were all confirmed as Pasteurella multocida . Biochemical profiles allocated the isolates to 4 groups, 3 being variants of P multocida subsp multocida and the fourth being P multocida subsp septica . REA performed with Hpall established 7 groups. Ribotyping using the Hpall digests probed with the 16S rRNA operon of Haemophilus paragallinarum recognised the same 7 groups as REA. Unlike the biochemical profiles, both REA and ribotyping provided a fine subdivision that identified outbreaks as either related or unrelated. The REA and ribotyping patterns as well as biochemical profiles were stable for all isolates from the outbreaks in which multiple isolates were obtained from either the same bird or from different birds. REA and ribotyping were found to be superior to biotyping methods for the investigation of fowl cholera outbreaks.  相似文献   

Uptake of PCBs by potatoes grown on sludge-amended soils     

B. Gosselin  L. M. Naylor  N. I. Mondy 《American Journal of Potato Research》1986,63(10):563-566

Katahdin potatoes were grown on soil treated with anaerobically digested sewage sludge to determine the level of PGBs absorbed. The sewage sludge treated soil contained 1.52±0.71µg/g PCB. Potato plant leaves and tuber pulp contained less than the detectable level (<0.007µg/g) of PCB. Potato peels contained 0.04µg/g PCB which is less than the FDA tolerance limit. From these data it appears unlikely that potatoes grown in PCB-contaminated soil will absorb sufficient quantities of PCBs to pose a significant health risk, especially if the potatoes are peeled prior to eating.  相似文献   

The haematology and histopathology ofTrypanosoma congolense infection in cattle     

Dennis C. Naylor 《Tropical animal health and production》1971,3(4):203-207

Summary The experimental findings are discussed as a whole in relation to the findings of other workers. The conclusion is drawn that the development of a primary anaemia of exceptional character complicated by haemodilution, plays a very important part in the pathogenesis ofT. congolense infection in cattle.

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Résumé Le résultat des expériences sont discutées comme un tout en relation avec les résultats d’autres chercheurs. La conclusion étant que le dévelopment d’une anémie primaire de caractère exeptionnel compliqué d’hémodilution, joue un r?le très important dans la pathogenèse de cette maladie.

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Parts 1 & 2 published in Trop. Anim. Hlth. Prod. (1971) 3, 95 & 159.  相似文献   

Intellectual development of children from interracial matings     

L Willerman  A F Naylor  N C Myrianthopoulos 《Science (New York, N.Y.)》1970,170(964):1329-1331

Interracial offspring of white mothers obtained significantly higher IQ scores at 4 years of age than interracial offspring of Negro mothers, suggesting that environmental factors play an important role in the lower intellectual performance of Negro children.  相似文献   

A comparison of the pathogenicity of two strains of hog cholera virus: 2. Virological studies     

S. KAMOLSIRIPRICHAIPORN  CJ MORRISSY  HA WESTBURY 《Australian veterinary journal》1992,69(10):245-248

Quantitative and qualitative differences were demonstrated in the amount of virus in a range of tissues from pigs infected with either the Weybridge or New South Wales (NSW) strains of hog cholera (HC) virus. The titre of the Weybridge strain in samples, as assessed by either virus titration in cell culture or by the density of specific fluorescing cells in tissue sections, was higher than that for the NSW strain. This correlated with the greater severity of the clinico-pathological syndrome induced by the Weybridge strain. The implications of the differences in the virus content of tissues in the diagnosis of HC is discussed as is the use of monoclonal antibodies to differentiate HC and bovine virus diarrhoea viruses.  相似文献   

Familial incidence of hyperkalemic periodic paralysis in quarter horses.     

J M Naylor  J A Robinson  J Bertone 《Journal of the American Veterinary Medical Association》1992,200(3):340-343

The pedigrees of 17 horses with hyperkalemic paralysis were studied. All were first-, second-, or third-generation offspring of a common sire, 16 were registered Quarter Horses. Analysis indicated that it was unlikely that the concentration of hyperkalemic periodic paralysis in the offspring of this sire was attributable to chance. The familial nature of this condition should help veterinarians diagnostically. It also suggests that it is possible to reduce the incidence of this condition by breeding from non-affected lines of horses and reinforces the need for studies to determine whether the disease is genetic in origin. Although more affected horses were second-generation offspring, the proportion of horses affected was largest in the first generation and decreased progressively with each generation. This is probably because horses in the earlier generations have been observed for longer periods and thus clinical signs are more likely to have been noticed in these horses.  相似文献   

Relationships between metabolic changes and clinical signs in pregnant sheep given endotoxin.          下载免费PDF全文

J M Naylor  D S Kronfeld 《Canadian journal of veterinary research》1986,50(3):402-409

Groups of four pregnant ewes were allocated to the following feeding and intravenous endotoxin treatments: fed, Escherichia coli endotoxin (50 micrograms/kg X 75), fed, saline, fasted, E. coli endotoxin (50 micrograms/kg X 75) and fasted, saline. Endotoxin administration resulted in depression, fever, hypoglycemia, hypocalcemia and a reduction in nonesterified fatty acid and ketone body concentrations. Depression correlated best with body temperature (r = 0.76), fasted sheep showed smaller increases in body temperature and were less depressed following endotoxin. Three of eight endotoxin treated sheep died, mortality was not related to rectal temperature but was associated with lactic acidosis. Hypoglycemia was not associated with either death or depression. Fed sheep that were unable to stand had lower serum calcium concentrations than standing sheep.  相似文献   

Digestibility and rate of passage by lambs of water-stressed alfalfa     

D J Undersander  N A Cole  C H Naylor 《Journal of animal science》1987,64(6):1813-1820

Two lamb digestion experiments were conducted to evaluate the effect of alfalfa [Medicago sativa (L.)] grown under varying levels of water deficiency (stress) on the rate of passage and digestibility of various fibrous components. Experiment 1 consisted of a randomized complete block design in which 12 Suffolk X Hampshire crossbred wethers averaging 40 kg were fed alfalfa hay grown at three (10, 15 or 20 cm water/ha) levels of water per harvest. Experiment 2 consisted of a switchback design in which four Hampshire wethers averaging 45 kg were fed alfalfa hay grown at two (5 or 20 cm/ha) levels of water per harvest. Forage yields ranged from 1,420 (10 cm/ha in Exp. 1) to 4,200 (20 cm/ha in Exp. 2) kg/ha. In both experiments, water stress reduced cell wall constituents (neutral detergent fiber), acid detergent fiber, lignin and cellulose content of the alfalfa hay. Organic matter digestibility was decreased when the percentage of leaves fell below 60% at the highest yield. Digestibility of N and the rate of NDF digestibility were not affected by water stress. The second experiment additionally included nutrient balance and rate of passage measurements. Greater (P less than .10) amounts of N and P were absorbed from water-stressed than nonstressed hay. Ruminal retention time of particulate markers tended (P less than .10) to increase with greater water stress. The results of this study are interpreted to indicate that while moderate water stress may have little effect on in vivo digestibility of alfalfa, severe stress may reduce digestibility of fibrous fractions and total organic matter.  相似文献   

Efficacy of erythromycin compared with penicillin/streptomycin for the treatment of virulent footrot in sheep   总被引：2，自引：0，他引：2  

JK WEBB WARE  CJ SCRIVENER  AL VIZARD 《Australian veterinary journal》1994,71(3):88-89

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Effect of storage of smears on the staining of ram spermatozoa by eosin or trypan blue     

P. SUTTIYOTIN  CJ THWAITES 《Australian veterinary journal》1994,71(3):87-87

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