خيارات البحث
النتائج 341 - 350 من 430
Acquired immunity after primary caseous lymphadenitis in sheep
1993
Pepin, M. | Pardon, P. | Marly, J. | Lantier, F. | Arrigo, J.L.
Caseous lymphadenitis (CIA) caused by Corynebacterium pseudotuberculosis is a worldwide disease of sheep and goats and is characterized by development of pyogranulomas in lymph nodes and lungs. Control of this disease by vaccination remains controversial, although toxoid vaccines are now commercially available in some countries. To determine the efficacy of acquired immunity to control CLA, the effect of primary infection on subsequent challenge exposure was investigated. Adult seronegative ewes were primarily inoculated with a streptomycin-sensitive strain of C pseudotuberculosis on the external part of the left ear and thereafter challenge-exposed by inoculation of the streptomycin-resistant strain 19R in the right ear. This protocol indicated that primary infection with at least 10(7) viable bacteria induced strong protection against subsequent challenge exposure; the ewes with primary infection did not develop lesions as a result of challenge exposure, whereas immune-naive ewes developed numerous pyogranulomas in the right car, in lymph nodes draining the inoculation site, and in the lungs. However, ewes with primary infection remained carriers of the disease as a result of primary inoculation. These results offer experimental support for development of more effective vaccination to control CLA, in sheep and goats, and this model indicates that animals with primary infection can be used as positive controls for protection when testing a candidate vaccine against CLA.
اظهر المزيد [+] اقل [-]Radiographic study of homotypic variation of long bones in dogs
1993
Markel, M.D. | Sielman, E.
Dogs have been used extensively as an experimental model for studying musculoskeletal disorders. Many of these studies incorporated sequential radiography to quantitate a particular treatment's effect, using the contralateral bone as the control condition. The contralateral bone can be used as a control only if there is bilateral symmetry between right and left limbs. We performed radiography (craniocaudal and lateromedial views) on 10 pairs of humeri, radii, femora, and tibiae from dogs, using an alignment jig, to radiographically determine homotypic geometric variations of long bones. The bones were divided into 5 regions: proximal epiphysis, proximal metaphysis, diaphysis, distal metaphysis, and distal epiphysis. The total bone diameter, medullary diameter, and cortical width (total of medial + lateral cortex or total of cranial + caudal cortex) were measured at specified slices throughout each of these regions. Fourteen of 540 homotypic comparisons revealed significant differences between right and left bones at either a slice or region. Although there were only 14 significant differences between right and left bones at any region or slice, measurements were more precise with lower coefficients of variation in the diaphyseal and epiphyseal regions. Homotypic differences in diaphyseal and epiphyseal regions were < 5.3 and 7.5%, respectively power = 0.8). In metaphyseal regions, however, homotypic differences were larger; these differences could have been as large as 11.5% for total bone diameter, 15.6% for medullary diameter, and 80.0% for cortical width without achieving significant differences between populations (power = 0.8). This study validated the concept of using the contralateral limb as the control condition in orthopedic studies using dogs, particularly when evaluating the geometric properties of long bones radiographically.
اظهر المزيد [+] اقل [-]Antibiotic resistance of Escherichia coli and Salmonella from apparently healthy slaughtered cattle and pigs, and diseased animals in Zambia
1993
Ngoma, M. (University of Zambia, Lusaka) | Suzuki, A. | Takashima, I. | Sato, G.
Development of haploid and diploid mouse parthenogenones: Effect of oocyte aging in vivo
1993
Pinyopummin, A. (Hokkaido Univ., Sapporo (Japan). Faculty of Veterinary Medicine) | Takahashi, Y. | Hishinuma, M. | Kanagawa, H.
Confirmed nucleotide sequence of fanF of Escherichia coli K99 fimbriae
1993
Abe, N. (National Inst. of Health, Tokyo (Japan)) | Moriishi, K. | Saito, M. | Naiki, M.
Nutritional secondary hyperparathyroidism occurring in a strain of German shepherd puppies
1993
Kawaguchi, K. (Hokkaido Univ., Sapporo (Japan). Faculty of Veterinary Medicine) | Braga, I.S.III | Takahashi, A. | Ochiai, K. | Itakura, C.
Effects of gamma-irradiation from cobalt-60 on pathogenicity of Eimeria tenella
1993
Youn, H.J. | Kang, Y.B. (Rural Development Administration, Anyang (Korea Republic). Veterinary Research Institute) | Jang, D.H. (Seoul National University, Seoul (Korea Republic). College of Veterinary Medicine)
Epidemiological studies on the respiratory cryptosporidiosis of broiler in Korea
1993
Oh, M.H. | Eun, G.S. | Kim, H.J. | Chung, U.I. (Miwon Institute of Animal Science, Seoul (Korea Republic))
Localization of adrenergic receptors in bovine esophageal groove
1993
Kang, T.M. | Cho, J.Y. | Yang, I.S. (Seoul National University, Seoul (Korea Republic). College of Veterinary Medicine) | Park, J.H. (Cheju National University, Cheju (Korea Republic). College of Agriculture)
Development of antigen for the microplate latex agglutination test on toxoplasmosis in animals
1993
Suh, M.D. | Lee, E.G. (Gyeongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)