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Volume 43, Issue 6
Displaying 1-8 of 8 articles from this issue
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MASAJI TAGUCHI, MASAKATSU KATO, MASANORI KIMURA, MAMORU ISHIKAWA, TAKA ...1990 Volume 43 Issue 6 Pages 413-416
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSVarious congenital anomalies caused by bovine viral diarrhea-mucosal disease (BVD·EMD) virus occurred from December 1986 to July 1987 on a dairy farm rearing 370 Holstein-Friesian cattle in Abashiri, Hokkaido. During this period, congenital anomalies occurred in 25 (24.5%) out of 102 pregnant dams. They included 5 aborted fetuses, 4 persistently infected cattle, and 16 calves with malformations of the central nervous system. The virus was epidemiologically presumed to spread among cattle on the farm at the end of October 1986. The relationship between gestational days when infected and fetal outcomes was of great interest, indicating variation of squelae with fetal maturation. Infections before 90 gestational days induced mostly abortion and persistently infected cattle, while those between days 90 and 150 caused congenital neurological defects. Infections after 150 gestational days had no adverse effects on fetuses. It appears that BVD·EMD virus caused a considerably great loss to cattle production upon invading a farm with a low population of immune cattle, and congenital anomalies induced by the virus varied depending on the gestational day on infected.View full abstractDownload PDF (593K) -
KANEYOSHI KANEKO, MASAHIRO NABEYA, HIROAKI OGINO, DAI NAKABAYASHI, TAI ...1990 Volume 43 Issue 6 Pages 417-422
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSAbortion of cows caused by Chlamydia psittaci (Cp) infection occurred at a region of Niigata Pref., 1988. Out of 17 cases, 15 fetuses were aborted at 129-221 days of pregnancy. Macroscopically, edema and enlargement of the liver, spleen and lymph nodes were noted. Microscopically, focal necrosis in the same organs was observed, and Cp specific antigen was demonstrated at the site of the foci by the indirect immunofluorescence antibody technique. Cp was isolated from the livers of the 10 fetuses tested. Specific antibody titer to Cp in the sera of the cows rose significantly after abortion. A considerablg high percentage of infection with Cp among cows in herds in the region was revealed by means of Cp isolation from feces and serological examination. However, route of invasion of Cp was unclear. These chlamydial abortions in cows may be the first confirmed cases in Japan.View full abstractDownload PDF (4580K) -
YASUICHI EZAKI, WATARU SHIRAI1990 Volume 43 Issue 6 Pages 423-431
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSUsing 561 female Holsteins and 154 Japanese Black Cattle, over 18 months of age, with recorded birthdates, and within the confinement of a yearly cattle breeding center, eruption of permanent anterior teeth, crown wear (appearance of occlusal dentin, appearance of attrition in crown contact surface, formation of conical dentition) and exposure of the root were observed to obtain necessary information in age determination. As a result, the above parameters were suggested to be closely related to breeding and its environment. Otherwise, no great differences were noted between the Holstein and Japanese Black cattle.
Age, 23±2 months: first permanent incisors erupt. Age, 30±2 months: second permanent incisors erupt. Age, 36±3 months: third permanent incisors erupt. Age, 44±4 months: permanent canineteeth erupt. Age, 4 years: dentin appears in the occlusal surfaces of the firstand second permanent incisors. Age, 5 years: dentin appears in the occlusal surfaces of the third permanent incisors and cutting margins of the permanent canineteeth become slightly worn. Age, 6 years: dentin appears in the occlusal surfaces of the permanent canineteeth. Age, 7 years: attrition and conical dentition are recognized and the first permanent incisal roots are occasinally exposed. Age, 8 years: the first and second permanent incisal roots become oxposed and attrition and conical dentition are recognized. Age, 9 years: the third permanent incisal roots become exposed and attrition and conical dentition are recognized. Age, 10 years: all dental roots become exposed and attrition and conical dentition are recognized. Age, 11 years: all dental roots become exposed, crown is short, interdental space is produced, and attrition and conical dentition are recognized. Age >12 years: all dental roots become remarkably exposed, crown is short small with interdental space, and attrition, conical dentition, cup-like crown, transparent dentin, and crown missing. are rarely noted. In these stages, correct determination is difficult.View full abstractDownload PDF (7576K) -
YOSHIKUNI TOYOMITSU, MANABU HASE, KAZUNORI MIZOSHITA, YOSHIO KITANO, T ...1990 Volume 43 Issue 6 Pages 432-435
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSIn September 1987, on a pig breeding farm in Kagoshima Prefecture, 6 newborn piglets died suddenly prior to their eighth postnatal day. Clinical, pathological and microbiological examinations of 3 dead piglets revealed no particular findings nor any responsible bacteria. A viral test, however, detected a virus having a cytopathic effect on ESK cells, in the respective parenchymal organs of 2 dead piglets. In view of its physical, biological and serological properties, the above virus was identified as Getah virus belonging to alphavirus of the Togaviridae. Thus, the animal deaths were thought to be due to postpartal infection with Getah virus, considering that the neutralizing antibody titer to the isolated virus was <2 for all of piglets, their litters and dams immediately before death.View full abstractDownload PDF (3506K) -
MORIMI HENNA, TOMOATSU KERUMA1990 Volume 43 Issue 6 Pages 436-440
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSIn Kuro island of Okinawa Prefecture, to control Boophilus microplus, coumaphos 50% wettable powderhas been used for about sixteen years, and BPMC 20% emulsifiable concentrate for about six months. Recently, in most pastures, control of ticks with these tickicides has become considerably difficult. Thus, susceptibility of unfed larval ticks collected from 7 pastures in the island to one organophosphorus (coumaphos), two carbamates (BPMC and propoxur), and one pyrethroid (flumethrin) was examined in the laboratory using the knockdown method. The KT50 values of coumaphos and two carbamates for the ticks tested were larger than that of a cultured reference tick which is susceptible to several tickicides. On the contrary, KT50 value of flumethrin for ticks tested was smaller than that of a cultured reference tick. According to this result, pyrethroid tickicide was used for tick control in all the pastures. As a result, ticks disappeared completels in all the pastres. Based on these observations, it was suggested that the ticks tested are resistant to the organophosphorus and carbamates tickicides, and the knockdown method is useful for measuring susceptibility of ticks to several tickicides, as well as for choice of effective tickicides.View full abstractDownload PDF (627K) -
Potential Concerning Size, Using Platinum ElectrodesKEI SATO, TAIICHIRO KUBOTA1990 Volume 43 Issue 6 Pages 443-446
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSWhen platinum electrodes of four different lengths were buried in the rabbit's ear and a micro-current was applied, the shorter the electrodes were the greater the rise in potential and the faster the process was. The potentials then remained high throughout the experiment.
The positive potential was always greater, but the ratio of positive to negative decreased as the length of the electrodes was shortened.View full abstractDownload PDF (3866K) -
NOBORU MACHIDA, YOSHINORI YAMAGA, KATSUMOTO KAGOTA1990 Volume 43 Issue 6 Pages 447-450
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSIn three dogs with sinus bradycardia, the reasons for the development of sinus bradycardia were discussed on the basis of notifications and clinical findings. These cases were admitted to a veterinary hospital with individual clinical signs of persistent coughing (Case 1), a sudden onset of anorexia and vomiting (Case 2), and continuous diarrhea for 20 days (Case 3), respectively. All the cases showed bradycardia, marked depression, listlessness and blank expressions as the common findings. In view of the clinical signs, electrocardiographic findings or detailed questioning, sinus bradycardia observed in these cases was considered to have been caused by high vagal tone due to coughing (Case 1) and psychosomatic disease (Cases 2 and 3), respectively. Case 1 was given atropine sulfate orally, which established a normal heart rate and led to disappearance of coughing. The condition of Case 2, originating from uneasiness accompanying separation from the owner was resolved by his return home. In Case 3, all symptoms, including bradycardia, disappeared a few days after improvement of its surroundings.View full abstractDownload PDF (702K) -
SATOSHI OSAME, HIROYUKI SEO, SHIGERU ICHIJO, ICHIRO INADA, TOHRU EGUCH ...1990 Volume 43 Issue 6 Pages 453-458
Published: June 20, 1990
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSSomatic cell counts (SCC) of subclinical mastitis after oral administration of vitamin (vit.) A and E were examined for 141 dairy cows of six groups; vit. ADE, vit. A and placebo administration once and twice at a 4-day interval with the same volume. Tocopherol levels in serum and red blood cells in the vit. E group increased significantly after one day of administration, and in milk increased gradually. Retinol and retinyl palmitate levels in serum and milk in the vit. A groups increased significantly after one day of administration. On the cases of the once administration, SCC in milk decreased only in one group used together vit. A and E with normal tocopherol levels in serum. On the cases of twice administration, SCC in the group used together vit. A and E decreased significantly after one day of the second administration, but no changes were found in the groups of vit. A and placebo administration. SCC in the quarters below 3, 000, 000 cells/ml of the groups of twice administration of vit. A and E together decreased markedly to under 500, 000 cells/ml, but in the quarters over 3, 000, 000 cells/ml did not decrease to normal counts.
Consequently, SCC in subclinical mastitis were decreased effectively by the administration of vit. A and E together, and especially effect of vit. E was an important factor.View full abstractDownload PDF (899K)
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