| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Veterinary Medical Research Institute, College of Veterinary Medicine, Iowa State University, Ames 50011
2 College of Veterinary Medicine, Cornell University, Ithaca, New York 14853
3 320 Ash Avenue, Ames, Iowa 50014
Discard milk from sick or antibiotic-treated cows is often used as an economical alternative to milk replacer at dairy farms. This practice poses a health risk to calves if the discard milk is from cows with mycoplasma mastitis. Mycoplasma bovis, Mycoplasma californicum, and Mycoplasma canadense are among the agents known to cause contagious mastitis in cattle and occasionally pneumonia, otitis media, or arthritis in calves. This report describes a recent outbreak of calf polyarthritis and respiratory disease on a midwest dairy farm. The farm fed discard mycoplasma mastitic milk to its calves. On-the-farm pasteurization of the discard milk to 65°C for 1 h before feeding prevented additional illness in the calves. Discard milk samples were collected before and after heating and tested for mycoplasma by culture. Only samples collected before pasteurization yielded live cultures. Common mastitic mycoplasma agents were also tested for sensitivity to heat. It was determined that 65°C killed M. bovis and M. californicum after 2 min of exposure, while M. canadense remained viable for up to 10 min. Exposure to 70°C inactivated M. bovis and M. californicum after 1 min, but M. canadense samples were positive for up to 3 min. Thus, M. canadense appears to be more heat resistant than M. bovis and M. californicum. Heat treatment that results in the destruction of M. canadense should be used for the pasteurization of discard mycoplasma mastitic milk.
Key Words: mycoplasma • pasteurization • discard milk
Submitted on February 18, 2000
Accepted on May 5, 2000
This article has been cited by other articles:
|
|
 |
|
  D. A. Moore, J. Taylor, M. L. Hartman, and W. M. Sischo Quality assessments of waste milk at a calf ranch J Dairy Sci, July 1, 2009; 92(7): 3503 - 3509. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. A. Elizondo-Salazar and A. J. Heinrichs Review: Heat Treating Bovine Colostrum Professional Animal Scientist, December 1, 2008; 24(6): 530 - 538. [Abstract] [PDF]
|
|
|
|
|
|
J. R. Stabel Pasteurization of Colostrum Reduces the Incidence of Paratuberculosis in Neonatal Dairy Calves J Dairy Sci, September 1, 2008; 91(9): 3600 - 3606. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. Johnson, S. M. Godden, T. Molitor, T. Ames, and D. Hagman Effects of Feeding Heat-Treated Colostrum on Passive Transfer of Immune and Nutritional Parameters in Neonatal Dairy Calves J Dairy Sci, November 1, 2007; 90(11): 5189 - 5198. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. R. Stabel, S. Hurd, L. Calvente, and R. F. Rosenbusch Destruction of Mycobacterium paratuberculosis, Salmonella spp., and Mycoplasma spp. in Raw Milk by a Commercial On-Farm High-Temperature, Short-Time Pasteurizer J Dairy Sci, July 1, 2004; 87(7): 2177 - 2183. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. M. Godden, S. Smith, J. M. Feirtag, L. R. Green, S. J. Wells, and J. P. Fetrow Effect of On-Farm Commercial Batch Pasteurization of Colostrum on Colostrum and Serum Immunoglobulin Concentrations in Dairy Calves J Dairy Sci, April 1, 2003; 86(4): 1503 - 1512. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
