Influence of Dry Period Bacterial Intramammary Infection on Clinical Mastitis in Dairy Cows

Milk samples were taken from 1920 quarters (480 cows, six herds) on four occasions to examine the relationship between quarter level intramammary infection (IMI) during the dry period and clinical mastitis in the next lactation. All quarters were sampled at drying off and within 1 wk of calving, and...

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Bibliographic Details
Published in:Journal of dairy science 2002-10, Vol.85 (10), p.2589-2599
Main Authors: Green, M.J., Green, L.E., Medley, G.F., Schukken, Y.H., Bradley, A.J.
Format: Article
Language:English
Subjects:
Animal bacterial diseases
Animal productions
Animals
Bacterial diseases
Biological and medical sciences
Cattle
Corynebacterium - isolation & purification
dry period
Enterobacter - isolation & purification
Enterococcus faecalis - isolation & purification
Escherichia coli - isolation & purification
Female
Fundamental and applied biological sciences. Psychology
Infectious diseases
intramammary infection
Lactation
Logistic Models
mastitis
Mastitis, Bovine - microbiology
Medical sciences
Milk - microbiology
Risk Factors
Serratia - isolation & purification
Staphylococcus - isolation & purification
Streptococcus - isolation & purification
Terrestrial animal productions
Vertebrates
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Summary:Milk samples were taken from 1920 quarters (480 cows, six herds) on four occasions to examine the relationship between quarter level intramammary infection (IMI) during the dry period and clinical mastitis in the next lactation. All quarters were sampled at drying off and within 1 wk of calving, and two quarters from each cow were sampled both 0 to 7 and 8 to 14 d before calving. Milk samples were collected from all cases of clinical mastitis during the following lactation. Logistic regression models were developed to investigate the associations between IMI present during the sampling period and clinical mastitis. The probability of a quarter succumbing to clinical mastitis increased when Streptococcus dysgalactiae, Streptococcus faecalis, Escherichia coli, or Enterobacter spp. were cultured at drying off and when Escherichia coli, coagulase-positive staphylococcus, Serratia spp., or Streptococcus faecalis were cultured in two out of three late dry and post-calving samples. Quarters from which Corynebacterium spp. were isolated at drying off were at an increased risk of clinical mastitis, whereas the presence of Corynebacterium spp. in the late dry and post-calving samples was associated with a reduction in the risk of clinical mastitis. The risk of mastitis for specific pathogens increased if the same species of bacteria that had caused mastitis was isolated at least twice in the late dry and post-calving samples. Kaplan-Meier survival plots indicated that clinical mastitis associated with dry period infections was more likely to occur earlier in lactation than clinical mastitis not associated with dry period infections. There was evidence of quarter susceptibility to IMI or the possibility that infection with one organism led to clinical mastitis with another.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(02)74343-9