PERINATAL LAMB MORTALITY IN WESTERN AUSTRALIA: 5. VIBRIONIC INFECTION     

S. M. Dennis B.V.Sc.  Ph.D.  F.R.C.V.S.  M.A.C.V.Sc. 《Australian veterinary journal》1975,51(1):11-13

Vibrionic abortion was diagnosed in sheep on 48 occasions between 1963-65 and 3 of these were associated with other major abortion pathogens. The outbreaks were scattered throughout the agricultural area of Western Australia. Time-of-death of 91 infected lambs was: ante-parturient death 50.5%, parturient death 13.2% and post-parturient death 36.3% (deaths occurring immediately after death 28.6%, deaths delayed after death 2.2%, and late post-parturient death 5.5%). The majority of lambs had gross lesions, mainly subcutaneous oedema and excess fluid and fibrin in the serous cavities. The characteristic gross liver foci were present in 37.4% of the infected lambs examined. Seven lambs with signs of starvation had liver lesions: necrotic foci (6) and hepatomegaly (1); Campylobacter fetus subsp. intestinalis was recovered from the liver and/or gall bladder of each of the lambs. Epizootiological observations were reported including outbreaks under hot semi-arid conditions.  相似文献   

Diagnostic ultrasound examination of the dorsal aspect of the equine metacarpophalangeal joint     

Paula D. Modransky DVM  Norman W. Rantanen DVM  MS  Michael L. Hauser BS  Barrie D. Grant DVM  MS 《Journal of Equine Veterinary Science》1983,3(2):56-58

Diagnostic ultrasonography was used to demonstrate villonodular synovitis of the equine metacarpophalangeal joint. The presence of the soft tissue, intracapsular mass was confirmed with conventional radiography and positive contrast arthrography. The mass was surgically excised and submitted for histopathologic identification.  相似文献   

Hands-on CPD for rural practice?     

Dennis JD 《The Veterinary record》2000,146(13):383

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Effect of time and temperature on PrPCWD immunoreactivity as evidenced by Western blot.     

Joni Triantis  Michelle M Dennis  Mo D Salman  Daniel H Gould 《Journal of veterinary diagnostic investigation》2007,19(4):389-391

The protease-resistant infectious prion protein, PrPres, that causes transmissible spongiform encephalopathies, is remarkably resistant to conventional physical and chemical sterilization methods, including heat. It was hypothesized that thermal-dependent PrPres degradation has been underestimated, and the effect of prolonged incubation at 37 degrees C, 55 degrees C, and 80 degrees C on PrPres detection was examined using brain homogenates from chronic wasting disease-affected elk and mule deer (PrPCWD). Immunoblotting demonstrated progressive loss of PrPCWD immunoreactivity with time in all incubated samples as temperature increased, and PrPCWD was virtually undetectable after 90 days of incubation at 55 degrees C and 80 degrees C. These results indicate that decontamination methods and tissue disposal systems maintaining elevated temperatures for long periods of time could interfere with immunodetection, and the reliability of assays for PrPres detection could be compromised when applied to tissues exposed to heat with time. Although these results may suggest that such prolonged heat treatment could destroy prions, the observed loss of immunoreactivity does not necessarily correlate with a concurrent loss of infectivity. Bioassay is needed to determine if samples that have been incubated under these conditions retain infectivity.  相似文献   

Risk factors associated with a skewed natal sex ratio in captive black rhinoceroses (Diceros bicornis) in the United States.     

Patricia M Dennis  Paivi J Rajala-Schultz  Julie A Funk  Evan S Blumer  R Eric Miller  Thomas E Wittum  William J A Saville 《Journal of zoo and wildlife medicine》2007,38(4):533-539

The skew toward males in the sex ratio of calves is considered to be a problem for the captive population of black rhinoceroses (Diceros bicornis) in North America. This study used a retrospective case-control design to determine whether there was a predisposition toward birth of male calves over female calves and to examine risk factors associated with the occurrence of any detected skewed natal sex ratio in captive black rhinoceroses in the United States. The study population included captive female black rhinoceroses housed in the United States that had given birth to at least one calf of known sex. This study confirmed a skewing of the natal sex ratio toward male calves in the captive black rhinoceros population. The skewed ratio was found in calves born to wild-born dams, for which an increased time in captivity, irrespective of age, was associated with an increased likelihood of a male calf. Dams between 12 and 19 yr of age had a decreased likelihood of a male calf. The data also suggested a possible trend for the southern subspecies of black rhinoceros (Diceros bicornis minor) to be more likely to produce male calves than the eastern subspecies (Diceros bicornis michaeli). No associations were found with the sex of offspring in captive-born dams: however, this lack of association could be a result of low power in the study.  相似文献   

Endothelin-1, nitric oxide, and glutamate in the normal and glaucomatous dog eye     

Maria E. Källberg  Dennis E. Brooks  Kirk N. Gelatt  Gustavo A. Garcia-Sanchez†  Nancy J. Szabo  George N. Lambrou‡ 《Veterinary ophthalmology》2007,10(S1):46-52

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Measurement of retinal nerve fiber layer thickness in normal and glaucomatous Cocker Spaniels by scanning laser polarimetry     

Gustavo A. García-Sánchez†  Félix Gil-Carrasco‡  Jesús Jiménez Román‡  Dennis E. Brooks§  Ana Álvarez-Clau¶  Giselle Hosgood†  Simone Iwabe  Norma A. Moreno-Mendoza 《Veterinary ophthalmology》2007,10(S1):78-87

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Identification of a Streptococcus equi Strain Responsible for Four Outbreaks of Strangles in Colorado     

J.M. Rosser DVM  A.S. Waller PhD  BSc  J.L. Traub-Dargatz DVM  MS  DACVIM  M.D. Salman DVM  MPVM  PhD  DACPVM  R. Magnuson BS  J. Triantis MS  J.R. Newton BVSc  MSc  MRCVS 《Journal of Equine Veterinary Science》2007,27(9):395-397

The objective of this study was to use a new subtyping technique to determine the identity of five Streptococcus equi isolates from four outbreaks of strangles in Colorado during 2005−2006. All five of the isolates from the four strangles outbreaks in Colorado contained SeM allele 28. This SeM allele is typical of American isolates of S. equi and has previously been linked with strangles outbreaks in Minnesota in 1994 and Kentucky in 1995. Use of the new S. equi strain subtyping method allowed for characterization of recent S. equi isolates associated with outbreaks of strangles in Colorado. To our knowledge, this is the first report of typing of more recent isolates from North America. This approach, however, has been used in situations in the United Kingdom to differentiate the vaccine strain of S. equi from that of the wild type of the bacteria.  相似文献   

Spatial and seasonal variability of photosynthetic parameters and their relationship to leaf nitrogen in a deciduous forest     

Wilson KB  Baldocchi DD  Hanson PJ 《Tree physiology》2000,20(9):565-578

We used gas exchange techniques to estimate maximum rate of carboxylation (V(cmax)), a measure of photosynthetic capacity, in the understory and upper crown of a closed deciduous forest over two seasons. There was extensive variability in photosynthetic capacity as a result of vertical canopy position, species type, leaf age and drought. Photosynthetic capacity was greater in oaks than in maples and greater in the overstory than in the understory. Parameter V(cmax) was maximal early in the season but declined slowly throughout most of the summer, and then more rapidly during senescence. There was also an apparent decline during drought in some trees. Variability in V(cmax) as a result of species or vertical canopy gradients was described well by changes in leaf nitrogen per unit area (N(a)). However, temporal changes in V(cmax) were often poorly correlated with leaf nitrogen, especially in spring and summer and during drought. This poor correlation may be the result of a seasonally dependent fractional allocation of leaf nitrogen to Rubisco; however, we could not discount Rubisco inactivation, patchy stomatal closure or changes in mesophyll resistance. Consequently, when a single annual regression equation of V(cmax) versus N(a) was used for this site, there were substantial errors in the temporal patterns in V(cmax) that will inevitably result in modeling errors.  相似文献   

A comparison of the Sepsis-2 and Sepsis-3 definitions for assessment of mortality risk in dogs with parvovirus     

Kelsey Turley DVM  DACVECC  Kiko Bracker DVM  DACVECC  Catherine Fernan BS  Emily Gao MS  MPH  Alexandra Orsky BA  Danni Yang BA  Virginia Sinnott-Stutzman DVM  DACVECC 《Journal of Veterinary Emergency and Critical Care》2023,33(2):208-216

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