Journal of Veterinary Medical Science
Online ISSN : 1347-7439
Print ISSN : 0916-7250
ISSN-L : 0916-7250
Volume 54 , Issue 6
Showing 1-35 articles out of 35 articles from the selected issue
  • Srihadi AGUNGPRIYONO, Yoshio YAMAMOTO, Nobuo KITAMURA, Junzo YAMADA, K ...
    1992 Volume 54 Issue 6 Pages 1063-1069
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    The stomach of the lesser mouse deer (Tragulus javanicus) was observed macroscopically. It consisted of only three compartments, rumen, reticulum and abomasum without omasum. The rumen was S-shaped with large ventral and caudoventral blind sacs and the reticulum was larger than the abomasum. Internally, the rumen was covered with numerous ruminal papillae even on the pillars and the ruminoreticular fold. These papillae were leaf- or tongue-like shaped and varied in size and density. The reticulum had honey-combed crests and the secondary crests were found rarely. The lips of the reticular groove were prominent and more developed in the aboral part than in the oral one. A sac-like transition zone, which had more prominent mucosal folds than had the floor of thc reticular groove, was observed between the caudal end of the reticular groove and the abomasum. Mucosal folds of the abomasum were spiral, low but rather thick. These findings were discussed in view of comparison with other ruminants and of possible functional implications.
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  • Terumasa SHIMADA, Sohjin SHIKANO, Kenichiro ONO, Atsushi SAITO, Naoyos ...
    1992 Volume 54 Issue 6 Pages 1071-1075
    Published: December 15, 1992
    Released: February 15, 2008
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    Changes of splenic lymphocyte subpopulation after Babesia microti and Babesia rodhaini inoculation in mice were examined by flow cytometric analysis. The B. microti inoculated mice showed a longer period of time from inoculation to the onset of increase or decrease parasitaemia (%), packed cell volume, total spleen cell numbers and surface immunoglobulin positive splenic cell numbers than respective periods in B. rodhaini inoculated mice. The Thy-1 positive cell numbers in B. microti inoculated mice and B. rodhaini inoculated mice pre-immunized with homologous parasites were significantly higher than that of B. rodhaini inoculated mice. The ratio of L3T4 positive cell/Lyt-2 positive cell after inoculation with B. microti was quite similar to that in B. rodhaini mice pre-immunized. However, the ratio in B. rodhaini inoculated mice revealed a lack of an increasing phase. These results suggested that the T-cell dependent early immune response, especially suppressor activity, was closely related to the difference in the course of infection between the non-lethal B. microti and the lethal B. rodhaini infection in mice.
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  • Sakae KONDOH, Yoh-Ichi MIYAKE, Yutaka NAKAHORI, Yasuo NAKAGOME, Yoshih ...
    1992 Volume 54 Issue 6 Pages 1077-1080
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    A bovine XY female in Holstein-Friesian heifer, which appeared as female with uterus and ovaries but did not show the estrus until 23 months old after the birth, was cytogenetically and molecularbiologically examined. As results of chromosome analysis, leucocyte and fibroblasts from skin, spleen and kidney examined had only metaphase plates with 60, XY. From these results and the clinical characteristics, this case was clearly diagnosed as a pure XY female. It was ascertained that the two genes, ZFY and AMG gene which located on the short arm of the Y chromosome (Yp) were detected in normal bulls and a XY female, but were not detected in normal cow, mother cow and half-sib heifer by Southern blotting.
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  • Kozo ADACHI, Akemi YOSHIMOTO, Takashi HASEGAWA, Takamasa SHIMIZU, Yosh ...
    1992 Volume 54 Issue 6 Pages 1081-1084
    Published: December 15, 1992
    Released: February 15, 2008
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    Due to the potential for anti-erythrocyte membrane antibodies as possible enhancers of erythrocyte destruction, the presence of serum anti-erythrocyte membrane antibodies in 31 dogs with Babesia gibsoni infection admitted to a veterinary hospital was investigated by an enzyme linked immunosorbent assay (ELISA) and immunoblotting analyses. This infection resulted in an increase of anti-erythrocyte membrane antibodies in 84% (IgG) and 74% (IgM) of 31 infected dogs, respectively. This was confirmed by the similarity in the protein profiles of the erythrocyte membrane antigens immunoblotted with rabbit antiserum to dog erythrocyte membrane antigens and infected dog serum. These results suggest the production of anti-erythrocyte membrane antibodies was induced by B. gibsoni infection.
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  • Eisuke KUME, Chiyo DOI, Shin-ichi ITAGAKI, Yoshikazu NAGASHIMA, Kunio ...
    1992 Volume 54 Issue 6 Pages 1085-1090
    Published: December 15, 1992
    Released: February 15, 2008
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    Experimental diabetes was induced in both control and unilaterally nephrectomized male mice by injecting streptozotocin (SZ) (50 mg/kg × 5 days) one week after nephrectomy. The time course changes in the glomerular lesions were examined for up to 12 weeks after completion of the SZ-injection (12WAI). In unilateral nephrectomized and diabetic mice, mild segmental expansion of the mesangial area developed at 4WAI, and it progressed to prominent segmental glomerulosclerosis at 12WAI. In the electron microscopic examination at 12WAI, marked expansion of the mesangial area, segmental thickening of the glomerular basement membrane, fusion of the foot processes of podocytes and a prominent increase in the number of microvilli of capillary endothelial cells were observed. On the other hand, mild to moderate expansion of the glomerular mesangial area was only sporadically found in unnephrectomized diabetic mice at 12WAI. Interestingly, Bowman's capsules of diabetic mice were generally lined with flattened epithelia but those of non-diabetic mice with cuboidal or low columnar epithelia.
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  • Kazunori IKE, Kazuyoshi KAWAHARA, Hirofumi DANBARA, Katsumi KUME
    1992 Volume 54 Issue 6 Pages 1091-1098
    Published: December 15, 1992
    Released: February 15, 2008
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    A total of 115 strains of Escherichia coli isolated from chickens with colisepticemia in Japan were examined for chicken lethality and virulence factors. It was found that serum resistance and aerobactin-mediated iron uptake are the most prevalent characteristics in these strains. Among them, S-20, a representative virulent strain of serotype O2, was further studied. S-20 harbored a conjugative 100-megadalton (Mdal) plasmid, designated pKI100. Curing and reintroduction experiments showed that pKI100 encodes both serum resistance and aerobactin-mediated iron uptake, and the diminished virulence of the pKI100-cured strain was fully restored by the reintroduction of the plasmid. These results demonstrated that pKI100 is the virulence plasmid of the S-20 strain, and that serum resistance and aerobactin-mediated iron uptake are the virulence factors in E. coli strains which cause avian colibacillosis.
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  • Hee Tae CHEONG, Yoshiyuki TAKAHASHI, Hiroshi KANAGAWA
    1992 Volume 54 Issue 6 Pages 1099-1103
    Published: December 15, 1992
    Released: February 15, 2008
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    This study was undertaken to examine the developmental capacity of reconstituted mouse embryos, and the influences of nucleus and cytoplasm on the development of these embryos following reciprocal pronuclear transplantation between in vitro 2-cell blocked and nonblocked embryos. Karyoplast containing pronuclei was transferred into the perivitelline space of the enucleated zygote and fused to cytoplasm with electrofusion. Maximum fusion rate was obtained when a field strength of 1.5 kV/cm was used. The fusion rates were high (86.2±3.2 to 90.6±2.0%) regardless of the strains of donor nucleus and recipient cytoplasm. Developmental rates of reconstituted embryos to the blastocyst stage, which were similar to that of the F1 (C57BL/6J × CBA) control were high when F1 embryos were used as the cytoplasm recipients (88.8±1.5 and 91.9±2.0%). When ICR embryos were used as the recipient cytoplasm, developmental rates were significantly reduced (71.5±2.9 and 54.1±3.2%), and affected by the source of nucleus. There were no significant differences in the cell number of embryos that developed to blastocysts and in the developmental rates to live young among the embryos reconstituted with different nuclei and cytoplasm, and the ICR control. The results of this study show that the development of reconstituted embryos is hardly affected by nuclear transplantation and electrofusion procedures. It is indicated that the recipient cytoplasm, rather than the donor nucleus, has the greater influence on the in vitro development of the reconstituted embryos to the blastocyst stage.
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  • Bela ELIAS, Mihaly ALBERT, Sandor TUBOLY, Pal RAFAI
    1992 Volume 54 Issue 6 Pages 1105-1110
    Published: December 15, 1992
    Released: February 15, 2008
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    The interaction between Bordetella bronchiseptica and type D toxigenic pasteurella multocida was studied in five groups of 4 specific-pathogen-free (SPF) piglets each. At 28 days of age, piglets of groups 3 and 4 were inoculated into both nostrils with 108 colony-forming-units (CFU) of a non-dermonecrotic toxin (DNT)-producing, phase I strain of B. bronchiseptica. Piglets of groups 1 and 3 were treated intranasally with a sonic extract of the non-toxic strain of B. bronchiseptica and those of groups 2 and 4 with B. bronchiseptica DNT into the left nostril. Sonic extract and DNT treatment was started at 33 days of age and lasted for 5 days. Piglets of group 5 served as controls. At the age of 37 days piglets of all groups except group 5 were inoculated into both nostrils with 5 × 107 CFU of toxigenic P. multocida. At slaughter at 50 days of age, P. multocida was recovered from the left nasal cavity of 3 piglets of group 2 and all piglets of group 4. In piglets inoculated with B. bronchiseptica DNT the mucosal epithelial cells of the left nasal cavity showed loss of cilia, regressive lesions such as vacuolation, karyopycnosis and necrosis, hypertrophy of the epithelium, infiltration of the epithelium and submucosa by inflammatory cells, could also be seen. The results suggest that action of the B. bronchiseptica DNT on the nasal mucosa is a precondition of the growth of P. multocida in the nasal cavity. It appears that colonization by P. multocida presupposes presence of a mucosal injury inflicted by B. bronchiseptica DNT in itself without involvement of the other virulence factors.
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  • Isao SHIBATA, Yutaka HATANO, Yuji INABA
    1992 Volume 54 Issue 6 Pages 1111-1115
    Published: December 15, 1992
    Released: February 15, 2008
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    Hysterectomy-produced colostrum-deprived 5- and 27-day-old pigs were inoculated intramuscularly (IM) or intranasally (IN) with the temperature-sensitive and thymidine kinase-deficient ZHtsTK- strain of Aujeszky's disease virus (ADV), and the nasal swabs and organs of the pigs were periodically collected for virus isolation. No abnormal clinical signs were observed in these pigs, except for a mild febrile response. Viral shedding in the nasal swabs with low titers was detected in the pigs inoculated IN between postinoculation day (PID) 1 and 5, but not in those of the pigs inoculated IM. No contact infection, however, occurred in the cohabiting pigs. Viruses with low titers were isolated only from the muscles and lymph nodes at the site of inoculation in the pigs inoculated IM on PID 2 and 4, but not from any organs of the pigs inoculated IN. To investigate the ability of the ZHtsTK- strain to establish a latent infection in pigs, the pigs inoculated IM or IN with the ZHtsTK- strain were treated with prednisolone. No virus was detected in the trigeminal ganglia or the nasal swabs collected after prednisolone treatment by the cocultivation method. The immunological evaluation demonstrated that immunization of pigs with this strain was effective in preventing clinical signs caused by ADV infection. The duration of virus shedding was markedly shortened in immunized pigs, particularly in those immunized twice and the total quantity of virus recovered from immunized pigs was reduced in comparison with unimmunized pigs.
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  • Mitsuharu MATSUMOTO, Hayao NISHINAKAGAWA, Masamichi KUROHMARU, Yoshihi ...
    1992 Volume 54 Issue 6 Pages 1117-1124
    Published: December 15, 1992
    Released: February 15, 2008
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    Effects of estrogen and progesterone on the first abdomino-inguinal mammary gland and the associated blood vessels in ovariectomized mice were investigated morphometrically, and light and electron microscopically. Although there were no significant differences in the area of the fat pad of the mammary gland among the experimental groups, the area of the mammary parenchyma and diameters of the blood vessels supplying the mammary gland, i.e., A. et V. circumflexa ilium profunda and A. et V. epigastrica caudalis superficialis, reached the maximal value in ovariectomized mice treated with estradiol (E)+progesterone (P). Similarly, the blood capillaries around buds and ducts of the mammary gland were most densely distributed in E+P treated mice. In the adipose tissues of the mammary stroma in intact mice, fat cells were of multilocular type in the tieripheral regions around the main vessel, and of unilocular type in the other part. In E and E+P treated mice, however, fat cells were mostly of unilocular type. These findings suggest that the formation of mammary fat tissues may occur in advance of that of the mammary parenchyma. By TEM, epithelial cells of the mamrnary parenchyma contained a large number of mitochondria and ribosomes, well-developed Golgi apparatus and rER; and large lipid droplets. Endothelial cells of blood capillaries displayed numerous pinobytotic vesicles, longer marginal folds and microvillous processes. Each organelle in these two cell types increased in number or developed to a greater degree in E+P treated mice than the other experimental groups. These observations prove the development of the mammary gland and associated blood vessels induced by the administration of E+P in ovariectomized mice, and indicate the close participation of ovarian steroid hormones in the development of the mammary parenchyma and vasculature.
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  • Kensuke HIRASAWA, Jin-Soo HAN, Makio TAKEDA, Shin-ichi ITAGAKI, Kunio ...
    1992 Volume 54 Issue 6 Pages 1125-1129
    Published: December 15, 1992
    Released: February 15, 2008
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    The mode of occurrence of encephalomyocarditis (EMC) virus-induced myocarditis in mice was pathologically and virologically investigated using 2 virus variants (highly diabetogenic EMC-D and non-diabetogenic EMC-B) and 2 mouse strains (diabetes-susceptible BALB/c and diabetes-resistant C57BL/6). Mice were inoculated with 105 PFU/head of the virus intraperitoneally and observed up to 7 days post inoculation (7DPI). As compared with EMC-B-infected BALB/c and EMC-D-infected C57BL/6 mice, EMC-D-infected BALB/c mice developed marked myocarditis and exhibited a heart virus titer of more than 100 times above that of the others after 4DPI. Electron microscopically, small aggregations of virus-like particles, with 20-25 nm in diameter, were found in the cytoplasm of degenerated cardiomyocytes showing mitochondria and myofibrillar degeneration in EMC-D-infected BALB/c mice.
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  • Miho OHUE, Takashi MAKITA
    1992 Volume 54 Issue 6 Pages 1131-1135
    Published: December 15, 1992
    Released: February 15, 2008
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    The interrelationship between lipid droplets and mitochondria in the interscapular brown adipose tissue of the hamster was investigated by electron microscopy. The membranous structure of mitochondria began to degenerate at the site in contact with lipid droplets. From that site, mitochondrial cristae also began to collapse. After being completely surrounded by lipid droplets, these degenerating mitochondria became vacuolated within them. Finally, lipid infiltrated into these vacuoles. Mitochondrion-like structures found in the lipid droplets may be possibly residues of the degenerating mitochondrial membranes.
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  • Naotoshi TSUJI, Tomoo ITABISASHI, Yoshio NAKAMURA, Noriyuki TAIRA, Mas ...
    1992 Volume 54 Issue 6 Pages 1137-1143
    Published: December 15, 1992
    Released: February 15, 2008
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    For obtaining the preliminary data on the pathogenesis of sudden death in calves naturally heavily infected with Strongyloides papillosus, we monitored 8 Holstein calves experimentally infected with the larvae on electrocardiographic and pneumographic changes. Six calves died suddenly on days 11 to 17 after infection. Sinus tachycardia had been recorded continuously since 1 to 6 days before death. Heart rates increased gradually until death. Since 1 or 2 days before death, various patterns of tachyarrhythmia and bradyarrhythmia had been observed among patterns of sinus tachycardia. Arrhythmias included serious ventricular premature beat, paroxysmal ventricular tachycardia, complete atrioventricular block and so on. The terminal pattern observed suddenly in all of the cases was ventricular arrhythmias consisting of serial ventricular tachycardia, flutter and fibrillation, which were followed by respiratory arrest. Abnormal pneumograms were not obtained before the terminal ventricular fibrillation. Two of 8 calves recovered from the infection, only one of which showed sinus arrest and the second degree of atrioventricular block transiently. We concluded that calves heavily infected with the larvae died due to sudden cardiac arrest.
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  • Tsutomu SEKIZAKI, Shigeru MIYAZAKI, Hiroya ITO, Tamae ASAWA, Isao NONO ...
    1992 Volume 54 Issue 6 Pages 1145-1149
    Published: December 15, 1992
    Released: February 15, 2008
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    Type 1 fimbriae from chicken pathogenic Escherichia coli strain PDI-386 (serotype O78) was purified and characterized. Because of the acid-induced autoagglutination (T. Sekizaki, Y. Nakasato, and I. Nonomura, J. Vet. Med. Sci. 54, 493-499, 1992), the fimbriae could be easily purified by repeating acid sedimentation, washing, and dissolving in buffer (pH 8.0). In electron microscopy, the purified fimbriae showed a filament of 8 nm in diameter and 10 μm in average length. The molecular mass of the protein subunit of the purified fimbriae estimated by sodium dodecyl sulfate-polydcrylamide gel electrophoresis (SDS-PAGE) was 19, 000 daltons. The amino acid composition and its NH2-terminal sequence were similar to the previously described one of the Klebsiella pneumoniae type 1 fimbriae. Moreover, there was an immunological relatedness between them. These results indicated that a molecular diversity found between the fimbriae of E. coli and that of K. pneumoniae has already been existed among chicken pathogenic E. coli strains.
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  • Masao AKUZAWA, Mitsuru MORIZONO, Kyoko SUDO, Nobuhiro YASUDA, Karoku O ...
    1992 Volume 54 Issue 6 Pages 1151-1155
    Published: December 15, 1992
    Released: February 15, 2008
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    Serum amylase activity was analyzed chromogenically (blue starch method) and its isoenzyme was separated by cellulose acetate membrane electrophoresis in newborn pigs comparing with those in adult pigs. Serum amylase activity in newborn pigs was about one half of adults' and increased with age. Serum amylase isoenzymes were separated into 4 fractions from the cathode. The isoenzymes were also classified in 5 types on the basis of the combination of these 4 fractions. Incidences of the fractions and the types were not significantly different between adults and newborns. After the iron dextran treatment, serum amylase activity as well as levels of erythrocytes, hemoglobin and packed cell volume increased. The rates of increase in hemoglobin and packed cell volume were more significant in the double treatment group than in the single treatment group, while serum amylase activity increased similarly in these 2 groups. The increase in serum amylase activity seemed to indicate that the development of amylase-producing organs was reinforced by the iron compound treatment. It is thought that serum amylase activity may be an indicator of healthy growth in newborn pigs.
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  • Tokihiro MATSUZAWA, Makoto HATSUGAI, Katsuhiko MORIGUCHI
    1992 Volume 54 Issue 6 Pages 1157-1163
    Published: December 15, 1992
    Released: February 15, 2008
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    Histochemical study on the changes of the aminopeptidase activities in rat testes after surgically-induced cryptorchidism was conducted comparing them with the histochemical changes in regenerated hepatic cells of the partially hepatectomized rat liver. Methionine-aminopeptidase in Leydig cells gradually increased after cryptorchid was induced, whereas the enzyme activity in regenerated hepatic cells decreased. These histochemical observations were coincident with the data obtained by enzyme assay. The present study has indicated that in the rat cryptorchid testis the increase of methionine-aminopeptidase activity was caused by hyperplastic Leydig cells.
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  • Yasuhiko FURUZAWA, Yasushige OHMORI, Tohru WATANABE
    1992 Volume 54 Issue 6 Pages 1165-1173
    Published: December 15, 1992
    Released: February 15, 2008
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    The application of immunohistochemical technique with antisera for glucagon (Glu), insulin (Ins), somatostatin (Som) and pancreatic polypeptide (PP) to serial sections of the cat pancreas permitted the quantitative evaluation of the population of 4 endocrine cell types and that of the area, larger diameter and density of islets. The pancreas was divided macroscopically into the 4 portions, duodenal, gastric, anastomotic and splenic. The duodenal portion was characterized by the localization of PP-immunoreactive (IR) cell-rich islets, the dissemination of PP-IR cells in the exocrine parenchyma and the absence of Glu-IR cells. In the duodenal portion, the area, the larger diameter and the density of islets were significantly smaller than those in the other 3 portions. On the contrary, the other 3 portions were marked with the deficiency of PP-IR cells and the existence of Glu-IR cell-rich islets. Ins-IR cells, identified as compact cell masses without any other types of cells, occupied a major part of every islet, composing much the same population throughout the 4 portions. The Som-IR cell population appeared to be closely in parallel with the Glu-IR cell population in all of the portions. It is concluded that all islets are similar in the Ins-IR cell population, but different in the complementary arrangement of Glu- and PP-IR cells. Based on this difference, 2 types of islets can be classified.
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  • Hirofumi DANBARA, Ryozo MORIGUCHI, Shoko SUZUKI, Yutaka TAMURA, Mayumi ...
    1992 Volume 54 Issue 6 Pages 1175-1178
    Published: December 15, 1992
    Released: February 15, 2008
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    Salmonella choleraesuis strains with and without 50-kilobase plasmid (pKDSC50) were intravenously inoculated into Yorkshire pigs. By the inoculation of 7.2×105 -3.5×107 cells, RF-1 strain with pKDSC50, but not 31N-1 strain without the plasmid, caused a septicemia. The inoculation of 8.7×109 RF-1 cells killed pigs at 2-4 day postinfection with severe hemorrhage on the whole body. Pigs with a similar number of 31N-1 cells (8.3×109 cells), showed milder hemorrhage, and they died at 6 day postinfection. These results indicated that pKDSC50 is reduired for RF-1 strain to express the full virulence causing a heavy cutaneous pig septicemia.
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  • Takamitsu TSUBOI, Yoshitaka KANAZAWA, Tomotaro SYOJI, Shuichi TOKUHISA
    1992 Volume 54 Issue 6 Pages 1179-1181
    Published: December 15, 1992
    Released: February 15, 2008
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    Bovine follicular oocytes collected from bovine ovaries were exposed to bovid herpesvirus 1 (BHV-1). After washings, these oocytes were cultured to mature. As a result BHV-1 could not be removed from the oocytes and could replicate in the oocytes with cumulus cells, but not in the oocytes without the cells. Moreover, the specific fluorescence for BHV-1 was detected in the cumulus cells by a indirect immunofluorescent technique. Therefore these findings suggested BHV-1 could be absorbed in the oocytes but the replication of BHV-1 was done in the cumulus cells.
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  • Minoru SAKAGUCHI, Ryohei NISHIMURA, Nobuo SASAKI, Toshikazu ISHIGURO, ...
    1992 Volume 54 Issue 6 Pages 1183-1185
    Published: December 15, 1992
    Released: February 15, 2008
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    Enhancing effect of an opiate agonist-antagonist butorphanol (0.2 mg/kg) on sedation induced by medetomidine (80 μg/kg) was evaluated in pigs. Butorphanol significantly enhanced the depth of medetomidine-induced sedation and prolonged the duration of that assessed by posture score and spontaneous movement of pigs. The combination of medetomidine and butorphanol produced excellent muscle relaxation and moderate surface analgesia which was enough for procedures with mild pain in pigs.
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  • Tomoko TAJIMA, Takeshi HIRONAO, Taketsugu KAJIKAWA, Hitoshi KAWAMURA
    1992 Volume 54 Issue 6 Pages 1187-1189
    Published: December 15, 1992
    Released: February 15, 2008
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    We evaluated a soluble tetrazolium/formazan assay using 2, 3-bis (2-methoxy-4-nitro-5-sulfophenyl)-5-[(Phenylamino)-carbonyl]-2H-tetrazolium hydroxide (XTT) for chicken cell growth. Fifty microliter of solution containing 1 mg/ml of XTT and 0.025 mM phenazine methosulfate was added to the cells in a well of 96-well microplate. After 4 hr incubation at 37°C, the absorbance was measured at 490 nm. Under this condition, absorbances were well correlated with cell number of Marek's disease tumor cells and chicken embryo fibroblasts. Proliferation of chicken lymphocytes stimulated with mitogens was also effectively measured. The formazan of XTT is water-soluble and can be quantitated in culture medium without the necessity for extraction with organic solvents. Thus XTT assay is simple and useful for the quantity assay with chicken cells.
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  • Shigeru TAKAHASHI, Akiyoshi FUKAMIZU, Toshihisa HATAE, Yuji YAMADA, Fu ...
    1992 Volume 54 Issue 6 Pages 1191-1193
    Published: December 15, 1992
    Released: February 15, 2008
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    Angiotensinogen, the precursor of a vasoactive octapeptide angiotensin II, is the only known natural substrate of renin, and its reaction exhibits strict species specificity and is the rate-limiting step in the renin-angiotensin system that controls the blood pressure. We measured blood pressure and heart rate of the transgenic mice with overproduced human angiotensinogen, and showed no significant difference in these parameters between transgenic and nontransgenic mice. We also provided evidence that mouse renin could not cleave human angiotensinogen, indicating a lack of angiotensin production from the human substrate. These results suggested that the blood pressure of transgenic mice is normally maintained, probably due to the inability of mouse renin to release angiotensin from the transgene products.
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  • Tatsuya TAKIZAWA, Kazuyoshi ARISHIMA, Masako YAMAMOTO, Masahiko KUSANA ...
    1992 Volume 54 Issue 6 Pages 1195-1198
    Published: December 15, 1992
    Released: February 15, 2008
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    Measurements of the inner diameters (calibers) of the ductus arteriosus (DA) and pulmonary artery (PA) were made in late fetal rats and newborn rats, the latter being obtained by spontaneous or caesarean delivery. The fetal and newborn pups were frozen instantly with an acetone-dry ice mixture. The chests of these whole-body frozen pups were shaved with a surgical knife gradually from the back toward the ventral side to expose the DA and PA for measurements of their calibers. As a result, it was revealed that the DA was almost closed 180 min after birth, but that the closure and shirinkage of the DA were accelerated to some extent by caesarean delivery. On the other hand, there was no remarkable change in the PA throughout the postnatal period observed, regardless of the type of delivery, spontaneous or caesarean.
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  • Kiichi KANAYAMA, Tadashi SANKAI, Koichi NARIAI, Tuyoshi ENDO, Yuzi SAK ...
    1992 Volume 54 Issue 6 Pages 1199-1200
    Published: December 15, 1992
    Released: February 15, 2008
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    Artificial insemination was carried out by injecting semen into the upper part of the left uterine horn in rabbits with a duplex uterus. Ovulation was then induced by administration of hCG. As a result, implanted fetuses were observed not only in the left uterine horn but also in the right uterine horn. However, when similar insemination was carried out after ligation of the right utero-tubal junction, fertilization did not occur in the right oviduct. From these finding, we conclude that some of the spermatozoa injected into the left uterine horn was discharged into the vagina, entered the right uterine cervical canal, and reached the right oviduct to fertilize the ova.
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  • Yasuhiko FURUZAWA, Yumi UNE, Yasuo NOMURA
    1992 Volume 54 Issue 6 Pages 1201-1203
    Published: December 15, 1992
    Released: February 15, 2008
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    A cat that was suspected some insulin resistance was diagnosed as pituitary dependent hyperadrenocorticism from an adrenocorticotropic hormone (ACTH) stimulation test, dexamethasone suppression test and measure of endogenous plasma ACTH concentration. Histopathological examination revealed chromophobe adenoma in pituitary gland and hyperplasia in adrenal cortex.
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  • Yukio SEMIYA, Kan-ichi OHSHIMA, Hiroshi ITOH, Ryu-koh MURAKAMI
    1992 Volume 54 Issue 6 Pages 1205-1207
    Published: December 15, 1992
    Released: February 15, 2008
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    A 9-days-old calf which had exhibited depression and difficulty to stand and walk was examined pathologically and bacteriologically. The primary pathological changes consisted of multifocal necrosis in several visceral organs and fibrinopurulent meningitis. The necrotic lesions were most frequently found in the liver, and accompanied with mononuclear cell infiltration and Gram-positive small bacilli. The organisms were also present in the foci of mononuclear cells at the central gray matter of the mesencephalon. Listeria monocytogenes was isolated from the brain and other organs of the whole body.
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  • Hitoshi KAWAMURA, Tomoko TAJIMA, Takeshi HIRONAO, Taketsugu KAJIKAWA, ...
    1992 Volume 54 Issue 6 Pages 1209-1211
    Published: December 15, 1992
    Released: February 15, 2008
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    Replication of porcine cytomegalovirus was examined in fibroblast- and epithelial-like cell lines of the 19-PFT cell line derived from pig fallopian tube. The virus grew well in the fibroblast-like cell line than the epithelial-like cell line. Cytomegalic cytopathic effects of the virus were clearly observed under the microscope after dispersion of the infected cell culture by trypsin-versene and it was demonstrated that cytomegalic cytopathic effects could be used for infectivity titration. Intranuclear inclusions were formed in the infected cells and herpetic virus particles were observed in the nucleus and cytoplasm when infected cells were observed under the transmission electron microscope. Infected cells formed characteristic red plaque.
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  • Noboru MACHIDA, Takashi NAKAMURA, Keiji KIRYU, Shigeyuki HARAMAKI, Kim ...
    1992 Volume 54 Issue 6 Pages 1213-1216
    Published: December 15, 1992
    Released: February 15, 2008
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    A 20-year-old pony mare with persistent ventricular tachycardia (VT) was examined cardiopathologically. At necropsy, the heart was enlarged and rounded with both ventricular dilatation. In a longitudinal section of the ventricular septum, a large grayish white patchy lesion (5×25 mm) was detected in the relatively higher portion. Microscopically, the lesion was extensive myocardial fibrosis located in the vicinity of the proximal part of the left bundle branch. Partially the fibrotic lesion was in contact with the branch. Such a lesion might play an important role in creating a suitable background for the development of VT via automaticity or reentry mechanism.
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  • Shohkichi IWAMURA, Nobuo KOIZUMI, Yutaka MATSUBARA, Kazuhito HONJO, Ka ...
    1992 Volume 54 Issue 6 Pages 1217-1218
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    Changes in the levels of plasma cortisol, progesterone and total testosterone were examined in developing hairless and haired dogs. Cortisol levels in the hairless dogs seemed to be higher than those in haired dogs within the age of 4-5 weeks. No apparent changes were seen in the level of plasma progesterone between the groups of hairless females and haired females. Total testosterone levels in hairless males showed to be significantly lower than those in haired males at the age of 13-21 weeks.
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  • Akio KIUCHI, Satoshi TAHARAGUCHI, Ryo HANAZAWA, Motonobu HARA, Teruo I ...
    1992 Volume 54 Issue 6 Pages 1219-1220
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    The genome of Malassezia pachydermatis isolates from dogs was resolved into six chromosomes by using pulsed-field gel electrophoresis and their molecular sizes were calculated as 820, 1, 100, 1, 400, 1, 470, 1, 660 and 1, 820 Kb, respectively. Comparison of electrophoretic patterns suggested that the chromosomes of M. pachydermatis were homozygous.
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  • Kozo ADACHI, Susumu MAKIMURA
    1992 Volume 54 Issue 6 Pages 1221-1223
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    To account for the conflict between the excessive destruction of erythrocytes and the number of parasitized erythrocytes in dogs infected with Babesia gibsoni, we examined the correlation between anti-erythrocyte membrane antibody level (AEMAL) and the number of erythrocytes (RBC count) in dogs with experimentally induced babesiosis using hematological examination and an enzyme linked immunosorbent assay (ELISA). In the infected dogs without splenectomy, more prominent reduction in RBC count accompanied with the elevated AEMAL was presented than anticipated from parasitemia until the 21st day. Furthermore, autoagglutinated erythrocytes and spherocytes were demonstrated in blood films. These results suggest that a humoral immunologic mechanism may be involved in a decrease in RBC count in dogs infected with B. gibsoni.
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  • Machiko NAKAMINE, Mamoru OHSHIRO, Yuichi AMEKU, Kikou OHSHIRO, Tomoats ...
    1992 Volume 54 Issue 6 Pages 1225-1227
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    The first outbreak of fowl cholera occurred in a flock of Muscovy ducks (Cairina moschata) in Okinawa Prefecture of Japan in November 1990. Fifty (25%) of 200 birds in a farm died of an acute disease. Remaining birds recovered after treatment with oxytetracycline. Pasteurella multocida subsp. multocida was isolated in pure culture from all tissues tested from two dead birds. Serovars of the isolates were identified as Carter's capusular type A. Heddleston's type 3·4·12, and Namioka's type 5:A which have not been demonstrated in Japan. Pathologically, multiple necrosis and bacterial aggregates were prominent in several organs, particularly in the liver. The isolate killed chickens when inoculated intravenously at a concentration of 108 colony forming units.
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  • Miho OHUE, Takashi MAKITA
    1992 Volume 54 Issue 6 Pages 1229-1232
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    Lipid globules in the white and brown adipose tissues in the rat were well preserved with prolonged postfixation in OsO4. The difference between the surface of white adipose tissue and that of brown adipose tissue was observed in such a way that the surface of the brown adipocyte was lumpy owing to the presence of intracellular lipid globules, and that the surface of the white adipocyte was considerably smooth. After the matrix of lipid globules was dissolved during specimen preparation, the subgranules embedded in the matrix were disclosed on the inner surface of the lipid globules. The cut surface of the white adipocyte contained a large lipid droplet and the amount of cytoplasm was poor, whereas the brown adipocyte had several lipid droplets and many small granules in the cytoplasm.
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  • Marc VASSART, Arnaud GRETH, Saud ANAGARIYAH, Francois MOLLET
    1992 Volume 54 Issue 6 Pages 1233-1235
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    Twenty-three biochemistry parameters and hematocrit were followed during 10 days in a 13 months old Arabian Oryx (Oryx leucoryx) during capture myopathy. An increase was found in bilirubin, creatine-kinase, alanine aminotransferase, and aspartate aminotransferase levels, but not in potassium level. Most of the parameters analyzed were the first given for this species.
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  • Ryohei NISHIMURA, Hwiyool KIM, Satoru MATSUNAGA, Minoru SAKAGUCHI, Nob ...
    1992 Volume 54 Issue 6 Pages 1237-1240
    Published: December 15, 1992
    Released: February 15, 2008
    JOURNALS FREE ACCESS
    The efficacy of atipamezole as a medetomidine antagonist was evaluated in pigs. The atipamezole doses (intramuscularly) were 80, 160, 320 and 480 μg/kg of body weight, which were one, two, four and six times higher than the preceding medetomidine dose (80 μg/kg, intramuscularly). Atipamezole effectively reversed medetomidine-induced sedation, and the optimal action was seen at doses of 160 and 320 μg/kg. Recovery from sedation was quick and smooth, and adverse effects such as hyperactivity or tachycardia were minimal with either dose.
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