Vagus indigestion related to a liver hemangioma.          下载免费PDF全文

R A Curtis  J J de Groot 《The Canadian veterinary journal. La revue veterinaire canadienne》1967,8(3):75-76

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Dictyocaulus viviparus in calves: effect of rotational grazing on the development of infections.     

M Eysker  J H Boersema  J B Cornelissen  F N Kooyman  W A de Leeuw 《Veterinary parasitology》1992,41(1-2):127-135

A study was made of the possibility of reducing lungworm infections in young grazing calves by rotational grazing for weekly periods on six paddocks. For this purpose three groups of four calves each were grazed on separate pastures in 1989, whereas a fourth group served as a permanently housed control group. Two groups of calves were infected experimentally with six doses of 10 larvae of Dictyocaulus viviparus during the first 3 weeks on pasture. In the third group, low natural infections with overwintered larvae occurred. One of the experimentally infected groups was rotationally grazed for weekly periods on six small plots while both other groups were set-stocked. Faecal larval counts and worm counts in tracer calves demonstrated lower lungworm infections in the rotationally grazed group than in both set-stocked groups. However, the numbers of worms found after challenge infection and subsequent necropsy were relatively high in the rotationally grazed group, indicating that development of immunity was less than in both other groups. Owing to the dry weather conditions in the summer of 1989, no serious clinical signs of husk developed in any of the three groups. These dry conditions, however, did not prevent the build-up of heavy pasture infectivity with gastrointestinal nematodes resulting in heavy worm burdens and serious clinical signs in tracer calves grazing for 4 days in August and September-October, respectively. This implies that rotational grazing did not have a clear effect on build-up of gastrointestinal nematode infections.  相似文献   

Mechanism of resistance to fenarimol in Aspergillus nidulans     

M.A. de Waard  J.G.M. van Nistelrooy 《Pesticide biochemistry and physiology》1979,10(2):219-229

Mycelial uptake of [¹⁴C]fenarimol (10 μg/ml) by 20 fenarimol-resistant mutants of Aspergillus nidulans was compared with uptake by wild-type strain 003. Uptake of the fungicide during the initial 10 min of incubation was significantly lower in all mutant strains than in the wild-type strain indicating that resistance is related with reduced uptake. Upon prolonged incubation a gradual decrease of accumulated radioactivity in the wild-type strain was observed. A few mutants displayed resistance to unrelated chemicals such as p-fluorophenylalanine or d-serine; this phenomenon appeared not to be due to a decreased uptake of the corresponding natural amino acids. Incorporation of [³H]adenine and [¹⁴C]leucine by mycelium of mutant M193 was hardly inhibited after 5 hr of incubation with the fungicide, whereas a distinct effect was found with the wild-type strain. At this time also fungitoxicity to the wild-type strain became apparent. Probably, this effect is indirectly caused by inhibition of ergosterol biosynthesis. Mycelium of mutant M193 incorporated [¹⁴C]acetate slightly less effectively than the wild-type strain. After 2 hr of incubation with this radiochemical leakage of [¹⁴C]acetate metabolites from mycelium of the mutant strain was observed. This indicates that resistance might be correlated with increased excretion of fungal metabolites, which in turn may be related with reduced fitness of fenarimol-resistant mutants.  相似文献   

Reticulosis of the visual system in a dog     

J. S. Smith  A. de  Lahunta R. C. Riis 《The Journal of small animal practice》1977,18(10):643-652

A 7-year-old male Kerry Blue Terrier had been compensating for a visual deficit for approximately 2 months. Five days before examination, the dog had suddenly lost all vision and the pupils had become widely dilated and unresponsive to light. Ophthalmic examination revealed inflammation of the optic discs. Response to therapy was favourable but temporary.
Post mortem findings consisted of granulomatous optic neuritis, meningoencephalitis and chorioretinitis, similar to reticulosis.  相似文献   

Serological characterization of strains of Moraxella bovis using double immunodiffusion.   总被引：4，自引：3，他引：1       下载免费PDF全文

C Gil-Turnes  F L de Araujo 《Canadian journal of veterinary research》1982,46(2):165-168

Sera were produced in rabbits against nine Moraxella bovis strains isolated in Brazil and three in the United States. Antigens were prepared for double immunodiffusion tests by thawing concentrated suspensions of the strains. Sera were tested against homologous and heterologous antigen preparations by the double immunodiffusion method. Sera showing precipitin bands with heterologous antigens were absorbed. Antigenic differences were detected between the strains and a provisional grouping of strains of M. bovis was suggested on the basis of antigenic composition. Differences between isolates from different geographical locations were found and some strains appeared antigenically more complex than others. The relevance of this work to vaccine production was suggested.  相似文献   

Long-term study of incidence and financial loss due to cattle babesiosis in an Argentinian dairy farm     

A. A. Guglielmone  D. H. Aguirre  E. J. A. Sp  th  A. B. Gaido  A. J. Mangold  L. G. de Rí  os 《Preventive veterinary medicine》1992,12(3-4):307-312

The incidence and direct financial loss caused by babesiosis were evaluated in 121 Holstein Friesian female cattle that formed eight cohorts (1981–1988) of a dairy farm located approximately 24° 55′S 65° 29′W in Salta, Argentina. Female calves born in 1986 and 1987 (n=32) were vaccinated with a live Babesia vaccine at six months of age.

No cases of babesiosis occurred in the vaccinated cattle. The incidence of babesiosis in the six non-vaccinated cohorts was 23.6% (21/89). Eighteen of the cases were the result of Babesia bovis, one to Babesia bigemina and two to a mixed infection. Two cattle died of B. bovis infection in spite of drug treatment (diaminazene, 3.5 mg kg⁻¹). No disease occurred in cattle younger than seven months or older than 24 months. The number of cases according to age of cattle was: 7–9 months, 5; 10–12 months, 6; 13–24 months, 10.

Financial loss for the six cohorts that suffered clinical cases amounted to US $ 1624.6 (prices in October 1990)—62% were the result of physical losses and 38% to costs of control. A benefit-cost analysis of vaccination was carried out assuming that 95% of the mortality and morbidity losses of the six non-vaccinated cohorts was prevented after a single inculation of a live vaccine (cost of a dose plus administration was US $ 4.2. The benefit-cost ratio was 4:1 for each US dollar expended.  相似文献   

Esperimenti di lotta contro due specie di Microlepidotteri     

Pietri-Tonelli P. de  Barontini A. und Tomasucci G. 《Journal of pest science》1959,32(1):15

Ohne Zusammenfassung  相似文献   

The significance of the cytoplasmic droplet in the disintegration of semen in Guernsey bulls     

S W van Rensburg  S J van Rensburg  W H de Vos 《The Onderstepoort journal of veterinary research》1966,33(1):169-184

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Phagocytic and nitroblue tetrazolium reductive properties of mature and immature neutrophils and eosinophils from blood and bone marrow from cows     

I D Silva  N C Jain  L W George 《American journal of veterinary research》1989,50(5):778-781

Functional capabilities of morphologically mature (segmented) and immature granulocytes (neutrophils and eosinophils) from bone marrow from cows were studied and compared with similar activities of segmented granulocytes from blood. Phagocytosis of Escherichia coli and postphagocytic oxidative metabolic stimulation, measured by nitroblue tetrazolium (NBT) reduction, were evaluated simultaneously. Phagocytosis was observed readily in segmented neutrophils, neutrophilic bands, and metamyelocytes and rarely in myelocytes. Phagocytosis was not seen in promyelocytes and myeloblasts. Neutrophilic bands and metamyelocytes were phagocytically less active than were segmented neutrophils. Washed segmented bone marrow neutrophils possessed phagocytic activity similar to that of blood neutrophils, whereas the activity of unwashed segmented bone marrow neutrophils was markedly less than that of blood neutrophils. Reduction of NBT was observed only in blood segmented neutrophils and bone marrow segmented neutrophils; the magnitude of NBT reduction was significantly (P = less than 0.005) less in bone marrow neutrophils than in blood neutrophils. Eosinophils were phagocytically less competent than were neutrophils. The NBT reduction was observed only in eosinophils from blood, but not in eosinophils from bone marrow.  相似文献   

A pre-clinical foundation for the small animal physician     

W. de  VRIES 《The Journal of small animal practice》1984,25(6):367-373

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