Dairy

Shedding of Mycobacterium avium subsp. paratuberculosis into Milk and Colostrum of Naturally Infected Dairy Cows over Complete Lactation Cycles

Authors
  • Laura K. Bradner (Iowa State University)
  • Judith R. Stabel (United States Department of Agriculture)
  • Donald C. Beitz (Iowa State University)
  • Suelee Robbe-Austerman (United States Department of Agriculture)

Abstract

The primary mode of transmission of Mycobacterium avium subsp. paratuberculosis (MAP) is fecal-oral. However, MAP is also shed into the milk and colostrum of infected cows. The objective of this study was to identify ifan association exists between stage of MAP infection and days in lactation with the amount of MAP present in milk and colostrum of naturally infected cows. Results indicated that MAP is primarily shed in early lactation and in cows with advanced infection. This experiment provides crucial information to dairy producers pertaining to the threat of MAP transmission via milk and colostrum. Producers now know that allowing a calf to suckle even once is exposing it to the highest concentrations of MAP and therefore possibly infecting the newest generation of animals

Keywords: ASL R2793

How to Cite:

Bradner, L. K., Stabel, J. R., Beitz, D. C. & Robbe-Austerman, S., (2013) “Shedding of Mycobacterium avium subsp. paratuberculosis into Milk and Colostrum of Naturally Infected Dairy Cows over Complete Lactation Cycles”, Iowa State University Animal Industry Report 10(1). doi: https://doi.org/10.31274/ans_air-180814-118

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Published on
01 Jan 2013
Peer Reviewed