Cull rates of dairy cattle with antibodies to bovine leukemia virus

Mark Thurmond, Randy L. Carter, Chris B. Maden, Mark C. Thurmond, Chris B. Maden, Randy L. Carter

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The relationship of cuH rate to age was investigated retrospec tively 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 antibody-negative cows yearly from 2 to 7 years of age. Cull rates, transformed by the Arc-sin square root, were analyzed by weighted regression. Transformed cull rates increased significantly as BLV-antibody-positive cows aged (one-tailed P = 0.023) but not as antibody-negative cows aged (one-tailed P = 0.59). A Mantel-Byar survival analysis showed significantly longer survival beyond 3.5 years of age among antibody-negative cows than among antibody-positive cows (P = 0.008).

Original languageEnglish (US)
Pages (from-to)1987-1989
Number of pages3
JournalCancer Research
Volume45
Issue number5
StatePublished - May 1 1985

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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    Thurmond, M., Carter, R. L., Maden, C. B., Thurmond, M. C., Maden, C. B., & Carter, R. L. (1985). Cull rates of dairy cattle with antibodies to bovine leukemia virus. Cancer Research, 45(5), 1987-1989.