Cytology of Post-Treatment Histoplasmosis     

Meinkoth J  Crystal M  Cowell R  Thiessen A 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1997,26(3):118-118

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What is your diagnosis? Palmar carpal bone fracture     

Vidal MA  Gaschen L  Mitchell CF 《Journal of the American Veterinary Medical Association》2007,231(3):379-380

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What is your diagnosis? Rhodococcus equi     

Thieman KM  Clark J  Johnson PJ  Essman S  Giuliano EA  Mitchell J;American College of Veterinary Radiology 《Journal of the American Veterinary Medical Association》2007,230(4):509-510

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In vitro biomechanical comparison of equine proximal interphalangeal joint arthrodesis techniques: prototype equine spoon plate versus axially positioned dynamic compression plate and two abaxial transarticular cortical screws inserted in lag fashion     

Sod GA  Mitchell CF  Hubert JD  Martin GS  Gill MS 《Veterinary surgery : VS》2007,36(8):792-799

Objectives— To compare in vitro monotonic biomechanical properties of an equine spoon plate (ESP) with an axial 3‐hole, 4.5 mm narrow dynamic compression plate (DCP) using 5.5 mm cortical screws in conjunction with 2 abaxial transarticular 5.5 mm cortical screws (DCP‐TLS) inserted in lag fashion for equine proximal interphalangeal (PIP) joint arthrodesis. Study Design— Paired in vitro biomechanical testing of 2 methods of stabilizing cadaveric adult equine forelimb PIP joints. Animal Population— Cadaveric adult equine forelimbs (n=18 pairs). Methods— For each forelimb pair, 1 PIP joint was stabilized with an ESP (8 hole, 4.5 mm) and 1 with an axial 3‐hole narrow DCP (4.5 mm) using 5.5 mm cortical screws in conjunction with 2 abaxial transarticular 5.5 mm cortical screws inserted in lag fashion. Six matching pairs of constructs were tested in single cycle to failure under axial compression with load applied under displacement control at a constant rate of 5 cm/s. Six construct pairs were tested for cyclic fatigue under axial compression with cyclic load (0–7.5 kN) applied at 6 Hz; cycles to failure were recorded. Six construct pairs were tested in single cycle to failure under torsional loading applied at a constant displacement rate (0.17 radians/s) until rotation of 0.87 radians occurred. Mean values for each fixation method were compared using a paired t‐test within each group with statistical significance set at P<.05. Results— Mean yield load, yield stiffness, and failure load for ESP fixation were significantly greater (for axial compression and torsion) than for DCP‐TLS fixation. Mean (± SD) values for the ESP and DCP‐TLS fixation techniques, respectively, in single cycle to failure under axial compression were: yield load 123.9 ± 8.96 and 28.5 ± 3.32 kN; stiffness, 13.11 ± 0.242 and 2.60 ± 0.17 kN/cm; and failure load, 144.4 ± 13.6 and 31.4 ± 3.8 kN. In single cycle to failure under torsion, mean (± SD) values for ESP and DCP‐TLS, respectively, were: stiffness 2,022 ± 26.2 and 107.9 ± 11.1 N m/rad; and failure load: 256.4 ± 39.2 and 87.1 ± 11.5 N m. Mean cycles to failure in axial compression of ESP fixation (622,529 ± 65,468) was significantly greater than DCP‐TLS (95,418 ± 11,037). Conclusion— ESP was superior to an axial 3‐hole narrow DCP with 2 abaxial transarticular screws inserted in lag fashion in resisting static overload forces and cyclic fatigue. Clinical Relevance— In vitro results support further evaluation of ESP for PIP joint arthrodesis in horses. Its specific design may provide increased stability without need for external coaptation support.  相似文献   

Effects of ractopamine supplementation on growth performance and carcass characteristics of feedlot steers differing in biological type     

Gruber SL  Tatum JD  Engle TE  Mitchell MA  Laudert SB  Schroeder AL  Platter WJ 《Journal of animal science》2007,85(7):1809-1815

Effects of ractopamine hydrochloride (RAC) supplementation on growth performance and carcass characteristics of feedlot steers differing in biological type were investigated using British, Continental crossbred, and Brahman crossbred calf-fed steers (n = 420). Steers of each type were weighed at reimplantation [British, mean BW = 375 kg (SD = 38 kg); Continental crossbred, mean BW = 379 kg (SD = 42 kg); Brahman crossbred, mean BW = 340 (SD = 32 kg)] and sorted into 7 BW blocks, each block consisting of 2 pens (10 steers per pen) per type. Pens within a block x type subclass were randomly assigned to RAC treatments (0 or 200 mg x steer(-1) x d(-1) fed during the final 28 d of the finishing period). The type x RAC interaction did not affect (P > 0.05) any of the traits evaluated in this study. Feeding RAC improved (P = 0.001) ADG (1.50 vs. 1.73 +/- 0.09 kg) and G:F (0.145 vs. 0.170 +/- 0.005), but did not affect (P = 0.48) DMI of steers. Dressing percentage, adjusted fat thickness, KPH percentage, and yield grade were not affected by RAC supplementation. Carcasses of steers fed RAC had heavier (P = 0.01) HCW (359 vs. 365 +/- 4.9 kg), larger (P = 0.046) LM areas (81.7 vs. 84.0 +/- 1.1 cm(2)), and tended (P = 0.07) to have lower mean marbling scores (487 vs. 477 +/- 5.2; Slight = 400, Small = 500) than did carcasses of control steers. Among the 3 biological types, Brahman crossbred steers had the lowest DMI and produced the lightest-weight carcasses that had the lowest mean marbling score (P < 0.05). Compared with Continental crossbred and Brahman crossbred steers, British steers produced carcasses with the greatest (P = 0.001) mean marbling scores. Continental crossbred steers had the heaviest BW and greatest dressing percentages and produced the heaviest carcasses with the largest LM areas (P < 0.05) compared with British and Brahman crossbred steers. In the present study, 28 d of supplementation with RAC at a dosage rate of 200 mg x steer(-1) x d(-1) elicited consistent responses in growth performance and carcass traits among 3 diverse biological cattle types.  相似文献   

Associations between cytokine gene expression and pathology in Mycobacterium bovis infected cattle     

Thacker TC  Palmer MV  Waters WR 《Veterinary immunology and immunopathology》2007,119(3-4):204-213

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Use of a Dental Composite to Correct Beak Deviation in Psittacine Species     

Rodney W. Schnellbacher  Alfred G. Stevens  Mark A. Mitchell  Hugues Beaufrere  Thomas N. Tully 《Journal of Exotic Pet Medicine》2010,19(4):290-297

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Isolation of intact sub-dermal secretory cavities from <Emphasis Type="Italic">Eucalyptus</Emphasis>     

Jason QD Goodger  Allison M Heskes  Madeline C Mitchell  Drew J King  Elizabeth H Neilson  Ian E Woodrow 《Plant methods》2010,6(1):20

Background  

The biosynthesis of plant natural products in sub-dermal secretory cavities is poorly understood at the molecular level, largely due to the difficulty of physically isolating these structures for study. Our aim was to develop a protocol for isolating live and intact sub-dermal secretory cavities, and to do this, we used leaves from three species of Eucalyptus with cavities that are relatively large and rich in essential oils.  相似文献   

A survey of Aleutian mink disease virus infection of feral American mink in Nova Scotia     

A. Hossain Farid  Priyanka Rupasinghe  Jessicca L. Mitchell  Kirsti Rouvinen-Watt 《The Canadian veterinary journal. La revue veterinaire canadienne》2010,51(1):75-77

Spleen samples from 14 mink that were trapped in 4 counties of Nova Scotia were tested for the presence of the Aleutian mink disease virus (AMDV) by polymerase chain reaction. Viral DNA was not detected in samples from Kings County (n = 2), but was detected in all the mink sampled from Colchester (n = 2) and Halifax (n = 6) counties, and 3 of 4 mink from Yarmouth County. The high level of AMDV-infected mink in Colchester and Halifax counties may pose a serious threat to the captive mink and wild animal populations. Because treatment of infected free-ranging mink is not an option, AMDV control strategies for the captive mink should be primarily focused on bio-security to protect clean ranches.  相似文献   

Characterisation of white line degeneration in sheep and evidence for genetic influences on its occurrence     

Joanne Conington  Laura Nicoll  Stephen Mitchell  L. Bünger 《Veterinary research communications》2010,34(5):481-489

Shelly hoof in sheep occurs when the hoof wall becomes detached from the laminar corium; it often then becomes impacted with debris leading to infection, pain and lameness. The problem of shelly hoof is under-reported and is often confused with classical footrot. A study was conducted using data on 9,169 Blackface and Texel sheep from 22 farms in the UK. The aim of the study was to estimate the prevalence of shelly hoof in these breeds, to quantify the genetic basis to shelly hoof, and to describe a pilot trail to characterise the physical properties of horn using Transmission Electron Microscopy (TEM). The results showed that shelly hoof has a high prevalence (47% for Blackface and 24% for Texel ewes) and is under moderate genetic control (h² = 0.3). The TEM images showed fragmented dorsal wall horn, microscopic crevices leading deeper into the hoof accompanied by bacteria and other micro-organisms. The invasion of bacteria was facilitated by separation of the cells in a characteristic ‘un-zipping’ phenomenon, poor attachment of the keratin to the cell membranes, poor cell membrane quality with a ‘lace-chain’ effect and incomplete keratinisation of the cells.  相似文献