Erythrokinetics in normal cats     

D B Gillis  R A Mitchell 《American journal of veterinary research》1974,35(1):31-33

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The place of clinical instruction in veterinary education     

B Mitchell 《The Veterinary record》1970,86(19):566-569

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Animal Health and Housing          下载免费PDF全文

W. R. Mitchell 《The Canadian veterinary journal. La revue veterinaire canadienne》1968,9(5):125

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Cultivation In Tissue Culture Of An Infectious Agent From Coital Exanthema Of Cattle. A Preliminary Report   总被引：5，自引：3，他引：2       下载免费PDF全文

A. S. Greig  G. L. Bannister  D. Mitchell    C. A. V. Barker 《Canadian journal of veterinary research》1958,22(4):119-122

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Evaluation of the complement fixation test for the diagnosis of pleuropneumonia of swine caused by Haemophilus pleuropneumoniae.   总被引：10，自引：6，他引：4       下载免费PDF全文

L H Lombin  S Rosendal    W R Mitchell 《Canadian journal of veterinary research》1982,46(2):109-114

Evaluation of diagnostic sensitivity and specificity was based on test results of 346 sera from pigs known to be infected and 139 sera from pigs known not to be infected. All sera were tested with a monospecific antigen (serotype 1) and a polyspecific antigen (serotypes 1-5). The sensitivity of the polyspecific antigen was approximately 85% at serum dilution 1:2 and was significantly higher than the monospecific antigen at all serum dilution levels. The specificity of the two antigen preparations was not significantly different at any dilution and increased from approximately 78% to 1:2 to 100% at 1:128. When pigs from herds with unknown incidence of infection were studied, it was found that a high proportion seroconverted, presumably as a response to subclinical infection. However, the antibody titres waned rapidly. This indicated that seroreaction expresses current or recent infection. Thus, the complement fixation test provides a reliable means of diagnosing pleuropneumonia of pigs and might be useful as a tool to control this disease.  相似文献   

Effects of propranolol on thyroid function in the dog   总被引：1，自引：0，他引：1  

S A Center  J Mitchell  R F Nachreiner  P W Concannon  T J Reimers 《American journal of veterinary research》1984,45(1):109-111

The effect of propranolol on thyroid function was evaluated in 6 mature euthyroid Beagles. Propranolol was administered orally in doses of 20 mg given 3 times daily for 2 weeks and then increased to 40 mg given 3 times daily for an additional 2 weeks. Six age- and sex-matched, euthyroid Beagles served as controls. Serum base-line concentrations of tetraiodothyronine (T4), triiodothyronine (T3), and reverse triiodothyronine (rT3) were measured before propranolol administration and at weekly intervals thereafter. Thyroid response to 5 IU of aqueous thyroid stimulating hormone administered IV was monitored before propranolol administration and at the 2- and 4-week treatment intervals. The T4, T3, and rT3 concentrations were measured by radioimmunoassay. There were no significant differences in base-line or postthyroid stimulating hormone serum concentrations of T4, T3, or rT3 in any individual or between the treatment or control groups at any treatment interval (P greater than 0.05). Seemingly, the therapeutic use of propranolol in euthyroid dogs should not alter thyroid hormone metabolism.  相似文献   

Reducing airborne pathogens and dust in commercial hatching cabinets with an electrostatic space charge system     

Mitchell BW  Waltman WD 《Avian diseases》2003,47(2):247-253

Commercial hatcheries typically infuse hydrogen peroxide or formaldehyde gas into hatching cabinets to reduce airborne pathogens that may lead to disease transmission during the hatch. A nonchemical option, an electrostatic space charge system (ESCS), was customized for full-sized commercial hatching cabinets and was tested extensively in broiler hatcheries. The ESCS cleans air by transferring a strong negative electrostatic charge to dust and microorganisms that are aerosolized during the hatch and collecting the charged particles on grounded plates or surfaces. In studies with three poultry companies, the ESCS resulted in significant (P < 0.0001) reductions of airborne dust of 77%-79%, in Enterobacteriaceae and fungus levels not significantly different (P > or = 0.05) from those with formaldehyde, and in 93%-96% lower Enterobacteriaceae than with no treatment or with hydrogen peroxide treatment (P < 0.01). The ESCS significantly (P < 0.05) reduced airborne Salmonella by 33%-83% compared with no treatment or hydrogen peroxide treatment. Results of this study suggest that the ESCS is a viable alternative to chemical treatment for reducing airborne pathogens in full-sized commercial hatchers, and it also provides dust control and containment, which should be helpful in reducing cross contamination and loading of ventilation ducts within different areas of the hatchery.  相似文献   

Investigations into the role of the thyrohyoid muscles in the pathogenesis of dorsal displacement of the soft palate in horses     

Ducharme NG  Hackett RP  Woodie JB  Dykes N  Erb HN  Mitchell LM  Soderholm LV 《Equine veterinary journal》2003,35(3):258-263

REASONS FOR PERFORMING STUDY: Contributes to the understanding of the pathogenesis of dorsal displacement of the soft palate during exercise so that management of this condition could be enhanced. HYPOTHESIS: That the thyrohyoid muscles play an important role in the stability of the laryngo-palatal relationship and that dysfunction of these muscles leads to dorsal displacement of the soft palate (DDSP) during exercise. METHODS: Ten horses were exercised on a high-speed treadmill under 4 different treatment conditions: control conditions (n = 10), after resection of thyrohyoid muscles (TH, n = 10), after sham-treatment (n = 5), or after restoration of function of the thyrohyoid muscles with surgical sutures (prosthesis-treatment, n = 6). During trials, the following determinations were made: videoendoscopy of the upper airway, gait frequency and pharyngeal and tracheal static pressures. RESULTS: None of the 10 horses developed DDSP during 2 separate treadmill-exercise trials under the control conditions. Seven of the 10 horses developed DDSP after resection of the TH muscles, 4 of 5 of these horses still experienced DDSP after sham-treatment, but 5 of 6 horses no longer experienced DDSP at exercise after the prosthesis-treatment. There were significant anomalies in airway pressures, respiratory frequency, and occurrence of DDSP in both the TH resection and sham-treatment conditions compared to control conditions. In contrast, no statistical differences were noted in any of the parameters measured between the prosthesis-treatment and control conditions. CONCLUSIONS: That the function of the TH muscles is important to the stability of the laryngo-palatal relationship and plays a role in the pathophysiology of exercise-induced DDSP. POTENTIAL RELEVANCE: Management of horses with DDSP could be enhanced by restoring the function of the TH muscles.  相似文献   

Welfare assessment of broiler breeders that are food restricted after peak rate of lay     

Hocking PM  Maxwell MH  Robertson GW  Mitchell MA 《British poultry science》2002,43(1):5-15

1. Broiler breeder females were reared on one of three growth curves (ad libitum, conventional or modified restriction) and given rations containing a high or low concentration of crude protein. After the peak rate of lay they were fed ad libitum or a decreasing quantity of food in response to declining egg production. The welfare of the birds was assessed by determining the changes in indices of welfare at 36, 48 and 60 weeks of age. 2. Body weight increased rapidly in restricted birds fed ad libitum post-peak and water intake declined. 3. Post-peak food restriction was associated with a decrease in resting and increased drinking and spot-pecking activities. Birds that were food restricted during rearing spent more time foraging and spot-pecking at 36 and 48 but not 60 weeks of age. 4. Immune function increased with age but was not affected by the experimental treatments. The heterophil-lymphocyte ratio in birds fed ad libitum during rearing was numerically lower at 36 and higher at 48 and 60 weeks of age compared with restricted birds. 5. There was no effect of treatment on plasma corticosterone concentration. Creatine kinase activity was high at 60 weeks in treatments that were characterised by poor reproductive status and the activities of other enzymes reflected differences in reproductive status and mortality. 6. There was no long-term welfare or production advantage from feeding low protein rations or more generous feeding during the rearing period compared with conventional food restriction programmes.  相似文献   

Fasciolosis in cattle and sheep     

Daniel R  Mitchell S 《The Veterinary record》2002,151(7):219

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