Cull Rates of Dairy Cattle with Antibodies to Bovine Leukemia Virus1
نویسندگان
چکیده
Therelationshipof cullrateto agewasinvestigatedretrospec tively in dairy cows with and without antibodiesto bovineleu kemiavirus(BLV).Bankedserafromeightannualherdtests on one 200-cowherdwere testedfor presenceof BLV antibodies by agar-gelimmunodiffusionusing the M, 51,000glycoprotein antigenof BLV.Age-specificcull rateswerecomputedfor BLVantibody-positiveandantibody-negativecowsyearlyfrom2 to 7 yearsof age.Cullrates,transformedby theArc-sinsquareroot, were analyzedby weightedregression.Transformedcull rates increasedsignificantlyasBLV-antibody-positive cowsaged(onetailedP = 0.023)but not as antibody-negativecows aged(onetailedP = 0.59).A Mantel-Byarsurvivalanalysisshowedsignifi cantlylongersurvivalbeyond3.5 yearsof ageamongantibodynegativecows thanamongantibody-positivecows(P = 0.008).
منابع مشابه
Cull rates of dairy cattle with antibodies to bovine leukemia virus.
The relationship of cull rate to age was investigated retrospectively in dairy cows with and without antibodies to bovine leukemia virus (BLV). Banked sera from eight annual herd tests on one 200-cow herd were tested for presence of BLV antibodies by agar-gel immunodiffusion using the Mr 51,000 glycoprotein antigen of BLV. Age-specific cull rates were computed for BLV-antibody-positive and anti...
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