Effect of Johne's disease status on reproduction and culling in dairy cattle

Journal of Dairy Science
R L SmithY T Gröhn

Abstract

Among the costs attributed to Mycobacterium avium ssp. paratuberculosis (MAP) infection in dairy cattle, the effects on reproduction and culling are the least documented. To estimate the cost of MAP infections and Johne's disease in a dairy herd, the rates of calving and culling were calculated for cows in each stage of MAP infection relative to uninfected cows. Data from 6 commercial dairy herds, consisting of 2,818 cows with 2,754 calvings and 1,483 cullings, were used for analysis. Every cow in each study herd was tested regularly for MAP, and herds were followed for between 4 and 7 yr. An ordinal categorical variable for Johne's disease status [test-negative, low-positive (low-shedding or ELISA-positive only), or high-shedding] was defined as a time-dependent variable for all cows with at least 1 positive test result or 2 negative test results. A Cox regression model, stratified on herd and controlling for the time-dependent infection variable, was used to analyze time to culling. Nonshedding animals were significantly less likely to be culled in comparison with animals in the low-shedding or ELISA-positive category, and high-shedding animals had nonsignificantly higher culling rates than low-shedding or ELISA-positive anim...Continue Reading

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Citations

Jan 7, 2011·Journal of Clinical Microbiology·Abani K PradhanYnte H Schukken
Nov 2, 2015·Preventive Veterinary Medicine·Rebecca L SmithYrjö T Gröhn
Jun 21, 2015·Veterinary Research·Maia MartchevaJudy Stabel
Jan 15, 2015·Preventive Veterinary Medicine·Rebecca M MitchellYnte H Schukken
Mar 8, 2016·Journal of Dairy Science·Karsten DonatCarola Sauter-Louis
Jun 16, 2015·Journal of Dairy Science·A B Garcia, L Shalloo
Aug 16, 2016·Journal of Theoretical Biology·Mohammad A Al-MamunYrjö T Gröhn
Nov 14, 2016·Journal of Dairy Science·Tracey C PritchardEileen Wall
Aug 28, 2017·Journal of Dairy Science·Martina VelasovaJavier Guitian
Jun 15, 2019·BMC Veterinary Research·Richard WhittingtonJacobus H de Waard
Oct 30, 2018·Animal : an International Journal of Animal Bioscience·A BugueiroF J Diéguez
May 1, 2018·Journal of Dairy Science·Leslie J Verteramo ChiuYrjo T Grohn
Oct 7, 2020·Animals : an Open Access Journal From MDPI·Mary Garvey
Feb 27, 2017·Preventive Veterinary Medicine·R L SmithY T Gröhn
Sep 8, 2021·Frontiers in Veterinary Science·I M G A Santman-BerendsG van Schaik

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