A cross-sectional study of bluetongue virus and Mycoplasma bovis infections in dairy cattle: II. The association between a positive antibody response and reproduction performance

I. J. Uhaa, H. P. Riemann, Mark Thurmond, C. E. Franti

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In a cross-sectional study to determine the possible relationship between a positive antibody test to bluetongue virus (BTV) or Mycoplasma bovis infections and reproductive performance of dairy cows, data were collected on 572 California dairy cows during December 1986 for analysis. Serum samples were tested using an enzyme-linked immunosorbent assay (ELISA). Data on reproduction variables were extracted from the individual cow sheets of the California Dairy Herd Improvement Association records and interfaced with the serological results for analysis. Similar data analyses for both BTV and M. bovis were performed to identify and quantitatively assess the association of the reproduction variables and each agent. These associations were evaluated unconditionally using the x2 for categorical variables and Student's t-test for continuous variables. Logistic regression analysis was used to determine if reproduction variables with significant unconditional associations remained significant when adjusted for the effects of possible confounding factors. Both the BTV and M. bovis ELISA antibody titres indicated exposure to the agents. The results of the multiple logistic regression analyses indicated that cows seropositive for BTV were significantly older at first calving (p<0.03). For M. bovis, seropositive cows were more likely to have longer intervals from calving to last service and longer intervals from calving to pregnancy diagnosis than seronegative cows (p<0.05). The other reproduction variables examined were not significantly associated with ELISA seropositivity.

Original languageEnglish (US)
Pages (from-to)471-480
Number of pages10
JournalVeterinary Research Communications
Volume14
Issue number6
DOIs
StatePublished - Nov 1 1990
Externally publishedYes

Fingerprint

Mycoplasma bovis
Bluetongue virus
Mycoplasma Infections
cross-sectional studies
dairy cattle
Antibody Formation
Reproduction
Cross-Sectional Studies
calving
cows
antibodies
Enzyme-Linked Immunosorbent Assay
enzyme-linked immunosorbent assay
infection
dairy cows
Logistic Models
Dairy Herd Improvement Associations
Regression Analysis
pregnancy diagnosis
Antibodies

Keywords

  • bluetongue
  • cattle
  • ELISA
  • Mycoplasma
  • reproduction

ASJC Scopus subject areas

  • veterinary(all)

Cite this

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abstract = "In a cross-sectional study to determine the possible relationship between a positive antibody test to bluetongue virus (BTV) or Mycoplasma bovis infections and reproductive performance of dairy cows, data were collected on 572 California dairy cows during December 1986 for analysis. Serum samples were tested using an enzyme-linked immunosorbent assay (ELISA). Data on reproduction variables were extracted from the individual cow sheets of the California Dairy Herd Improvement Association records and interfaced with the serological results for analysis. Similar data analyses for both BTV and M. bovis were performed to identify and quantitatively assess the association of the reproduction variables and each agent. These associations were evaluated unconditionally using the x2 for categorical variables and Student's t-test for continuous variables. Logistic regression analysis was used to determine if reproduction variables with significant unconditional associations remained significant when adjusted for the effects of possible confounding factors. Both the BTV and M. bovis ELISA antibody titres indicated exposure to the agents. The results of the multiple logistic regression analyses indicated that cows seropositive for BTV were significantly older at first calving (p<0.03). For M. bovis, seropositive cows were more likely to have longer intervals from calving to last service and longer intervals from calving to pregnancy diagnosis than seronegative cows (p<0.05). The other reproduction variables examined were not significantly associated with ELISA seropositivity.",
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