Effect of Mycobacterium avium subsp. paratuberculosis serostatus on carcass weight and conformation and fat cover scores

  • Ivan Mato ADSG Xundeva, Pol. Ind. Lalín 2000, Parcela B2/B3, 36500 Lalín (Pontevedra)
  • Natividad Pesqueira ADSG Xundeva, Pol. Ind. Lalín 2000, Parcela B2/B3, 36500 Lalín (Pontevedra)
  • Camino Factor ADSG Xundeva, Pol. Ind. Lalín 2000, Parcela B2/B3, 36500 Lalín (Pontevedra)
  • Fernando Camino Santiago de Compostela University, Institute of Food Analysis and Research (Animal Health and Epidemiology Unit), Veterinary Faculty of Lugo, Campus Universitario, 27002 Lugo
  • María L Sanjuán Santiago de Compostela University, Institute of Food Analysis and Research (Animal Health and Epidemiology Unit), Veterinary Faculty of Lugo, Campus Universitario, 27002 Lugo
  • Eduardo Yus Santiago de Compostela University, Institute of Food Analysis and Research (Animal Health and Epidemiology Unit), Veterinary Faculty of Lugo, Campus Universitario, 27002 Lugo
  • Francisco J. Diéguez Santiago de Compostela University, Institute of Food Analysis and Research (Animal Health and Epidemiology Unit), Veterinary Faculty of Lugo, Campus Universitario, 27002 Lugo Santiago de Compostela University, Veterinary Faculty of Lugo, Dept. Anatomy and Animal Production, Campus Universitario, 27002 Lugo
Keywords: Johne´s disease, carcass traits, serology, ELISA, economic losses

Abstract

The paper was designed to assess the influence of Mycobacterium avium subsp. paratuberculosis (MAP) infection status of cows at culling (antibody positive vs negative) on carcass traits: weight and conformation and fat cover scores. A generalized least squares linear model was used to assess the influence of MAP on weight. Subsequently, a random effects logistic regression was completed in order to model the relation between MAP and conformation score (fair vs poor carcasses). A random effects ordered logistic model was used to estimate the influence on fat cover. The results indicated that seropositives had carcass weights 58.45 (34.65-83.35) kg lower than seronegatives. Regarding conformation score, the odds of having poor conformation instead of fair was 3.85 (1.35-11.85) times higher in seropositives. The odds of seropositives achieving a higher fat cover was approximately 5 (1.41-9.09) times lower than the odds for seronegatives. The estimated effects could be useful when assessing the economic benefits of a paratuberculosis control program.

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Published
2017-04-20
How to Cite
Mato, I., Pesqueira, N., Factor, C., Camino, F., Sanjuán, M. L., Yus, E., & Diéguez, F. J. (2017). Effect of Mycobacterium avium subsp. paratuberculosis serostatus on carcass weight and conformation and fat cover scores. Spanish Journal of Agricultural Research, 15(1), e0502. https://doi.org/10.5424/sjar/2017151-10266
Section
Animal health and welfare