| options for the control of bovine leukemia virus in dairy cattle. | the subclinical impact of bovine leukemia virus (blv) on the sustainability of the us dairy industry is only now being fully recognized. findings of recent longitudinal studies conducted in michigan dairy herds were consistent with the results of previous studies in showing that within-herd prevalence of blv-infected cattle was negatively associated with milk production and cow longevity. risk factors relating to routes of hematogenous transmission such as the use of shared hypodermic needles, s ... | 2014 | 24697767 |
| association between bovine leukemia virus, production, and population age in michigan dairy herds. | the objective of this study was to determine the herd-level effect of bovine leukemia virus (blv) infection on dairy production, culling, and cow longevity. during routine herd testing, dairy herd improvement association technicians collected milk samples from about 40 cows from each of 104 randomly selected michigan dairy herds averaging ≥120 milking cows and 11,686 kg of milk/yr. milk samples were analyzed for the presence of anti-blv antibodies by elisa, and herd- and lactation-specific estim ... | 2012 | 22281337 |
| bovine leukemia virus and cow longevity in michigan dairy herds. | to determine the association between infection with bovine leukemia virus (blv) and cow longevity, a stratified random sample of 3,849 holsteins in 112 michigan dairy herds was followed for an average of 597 d following testing for blv antibodies with an elisa milk test. the hazard ratio of 1.23 indicates that blv-positive cows were 23% more likely than their blv-negative herd mates to die or be culled during the monitoring period. this result is adjusted for lactation number, which is also posi ... | 2013 | 23332856 |
| effect of infection with bovine leukemia virus on milk production in michigan dairy cows. | the objective of this study was to determine the association between individual cow-level milk production and bovine leukemia virus (blv) infection as measured by milk blv-elisa. dairy herd improvement technicians collected milk samples from 10 cows from each of first, second, third, and 4+ parity cows in 105 holstein herds with ≥ 120 milking cows. milk samples were tested for the presence of anti-blv antibodies by elisa. additional data regarding the cows and the herds were collected by farm su ... | 2016 | 26723124 |
| bovine leukemia virus and mycobacterium avium subsp. paratuberculosis are not associated with shiga toxin-producing escherichia coli shedding in cattle. | bovine leukemia virus (blv) is a retrovirus that causes enzootic bovine leukosis in cattle, and mycobacterium avium subsp. paratuberculosis (map) is the etiologic agent of johne's disease in cattle. both diseases are chronic in nature and can lead to the disruption of normal immunological or physiological processes. cattle are the major reservoir of shiga toxin-producing escherichia coli (stec), a cause of foodborne illness in humans. we tested the hypothesis that cattle infected with blv or map ... | 2017 | 28221870 |