variation amongst the neutralizing epitopes of bluetongue viruses isolated in the united states in 1979-1981.neutralizing epitopes present on field isolates of bluetongue virus (btv) serotypes 10, 11, 13 and 17 were evaluated with a panel of polyclonal and neutralizing monoclonal antibodies (mabs). a total of 91 field isolates were evaluated, including 15 isolates of btv-10, 29 isolates of btv-11, 26 isolates of btv-13, and 21 isolates of btv-17. the viruses were isolated from cattle, goats, sheep, elk and deer in idaho, louisiana, nebraska and, predominantly, california, in the years 1979, 1980 and 19 ...19921379766
enzootic toxoplasmosis in sheep in north-central united states.of 1,564 serum samples from adult ewes from 33 farms in iowa, minnesota, south dakota, kansas, and nebraska where toxoplasmosis-induced ovine abortions had been diagnosed, 65.5% were found positive for toxoplasma gondii antibodies using the modified agglutination test. toxoplasma gondii antibody titers of ewes were: less than 64 (34.5%), 64 (14.9%), 256 (22.0%), 1,024 (14.5%), and greater than 4,096 (13.8%). thus, 28.3% of sheep had high titers (greater than 1,024) indicating recently acquired t ...19892795369
reproductive problems associated with bluetongue virus activity in nebraska.abortions, stillborn calves, neonatal mortalities and excessive numbers of weak, slow-starting newborn have contributed to significant losses within the valuable breeding herds at the roman l. hruska u.s. meat animal research center. conception rates of 70 to 80%, abortion storms and neonatal mortality of 5 to 25% have been observed. vaccination programs control most of the common diseases that contribute to production losses. management and nutrition are considered adequate. excessive dystocia ...19852989844
bluetongue in western nebraska: an area herd study. 19852989845
cell culture adaptation and propagation of a reovirus-like agent of calf diarrhea from a field outbreak in nebraska. 19724623479
gastrointestinal nematode parasites from domestic sheep, ovis aries, in nebraska. 19705534024
risk factors for seroprevalence of ovine lentivirus in breeding ewe flocks in nebraska, usa.the prevalence of and risk factors for ovine lentivirus (olv) infection in 1466 breeding ewes in nine us meat animal research center (marc) flocks were determined using a recombinant transmembrane protein (ptm) enzyme-linked immunosorbent assay (elisa) to detect serum anti-olv antibodies and define infection. based on multivariable logistic regression, confinement birth and rearing (odds ratio (or) = 1.6), older weaning ages (or = 1.1 week-1), and older age (or = 1.3-2.5 year-1 beyond age 1 year ...19979234413
risk factors associated with herd-level exposure of cattle in nebraska, north dakota, and south dakota to bluetongue evaluate herd-level risk factors for seropositive status of cattle to 1 or more bluetongue viruses.200515934613
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