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Comparison of J5 Vaccinates and Controls for Incidence, Etiologic Agent, Clinical Severity, and Survival in the Herd Following Naturally Occurring Cases of Clinical Mastitis

D. J. Wilson^*, Y. T. Grohn, G. J. Bennett, R. N. González, Y. H. Schukken and J. Spatz

^* Department of Animal, Dairy and Veterinary Science, Utah State University, Logan 84321
Department of Population Medicine and Diagnostic Sciences, Cornell University, Ithaca, NY 14850
Animal Health Centre, Te Aroha, New Zealand, 3320

¹ Corresponding author: David.Wilson{at}usu.edu

Holstein dairy cattle in 3 commercial herds were randomly allocated to J5 vaccination (n = 251) or untreated control (n = 306) groups. There were 221 new cases of clinical mastitis (CM) affecting 120 cows. Coliform mastitis cases had a higher percentage of severe quarter swelling or signs of systemic illness among control cows but not among J5 vaccinates, in comparison to noncoliform cases. Culling or death from CM affected 13 controls (4.3%) and 4 vaccinates (1.6%), with losses occurring earlier in lactation among controls, a higher hazard (probability of a cow dying on each day of lactation) for controls than vaccinates. The J5 vaccination was significantly associated with protection from culling for mastitis among the 15 Klebsiella cases; 2 out of 10 (20%) Klebsiella-infected controls were culled and 0 out of 5 vaccinates were culled. Cows in second lactation were at reduced hazard of culling for mastitis compared with older animals, even when adjusting for effects of J5 vaccination. When all CM cases (including subsequent new cases during the same lactation and multiple quarters or pathogens within the same cow on the same day) were evaluated, for the 221 cases of CM, the rate was significantly higher among vaccinates than controls (0.10 and 0.07 cases/30 d in milk, respectively). This was because J5 vaccinates had more subsequent new cases of CM in the same cow than controls. Pathogens isolated, which included mainly environmental bacteria, were not different among J5 vaccinates and controls. Immunization with J5 was associated with protection against severe clinical coliform mastitis signs, culling, and death loss from CM but not with any reduction in overall CM.

Key Words: clinical mastitis • bovine mastitis • dairy cattle • immunology

This article has been cited by other articles:

				D. J. Wilson, B. A. Mallard, J. L. Burton, Y. H. Schukken, and Y. T. Grohn Association of Escherichia coli J5-Specific Serum Antibody Responses with Clinical Mastitis Outcome for J5 Vaccinate and Control Dairy Cattle Clin. Vaccine Immunol., February 1, 2009; 16(2): 209 - 217. [Abstract] [Full Text] [PDF]

				D. J. Wilson, Y. T. Grohn, G. J. Bennett, R. N. Gonzalez, Y. H. Schukken, and J. Spatz Milk Production Change Following Clinical Mastitis and Reproductive Performance Compared Among J5 Vaccinated and Control Dairy Cattle J Dairy Sci, October 1, 2008; 91(10): 3869 - 3879. [Abstract] [Full Text] [PDF]