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Best time to sample for accurate Somatic Cell Counts

It has been recognized that there exists diurnal variation in Somatic Cell Counts (SCC). This study evaluated how sampling time between milkings affects the sensitivity and specificity of somatic cell count as an indicator for...more


Hyperimmunization of lactating dairy cattle is associated with increased immunoglobulin levels and decreases severe clinical mastitis

More than 1000 second lactation or greater lactating dairy cattle were enrolled in a trial to determine the effect of hyperimmunization (HI) on severe clinical mastitis. Cows in the control group were immunized with three doses...more


No difference in innate immune response between Holsteins and Jerseys when challenged with intramammary Escherichia coli.

There have been some concerns that Holsteins are at greater risk for E. coli mastitis than Jerseys because of their higher milk production. This study compared the acute phase and cytokine response of Holstein and Jersey cows...more


Dry cow treatment may have an impact on antimicrobial resistance of fecal Escherichia coli

Eight farms practicing selective dry cow treatment were studied. Fecal and quarter milk samples were taken twice at two week intervals within four weeks of dry off and four weeks post calving from 162 cows (84 receiving DCT and...more


Q-fever pathogen related to increased somatic cell counts

In two separate studies, an association between PCR-based detection of Coxiella burnetii in milk and chronic subclinical mastitis in lactating dairy cows was identified. In a case-control study, quarter level C. burnetii status...more


No correlation between bulk milk SCC and clinical mastitis incidence

The objective of this study was to evaluate the association of pathogen-specific incidene rate of Clinical Mastitis (IRCM) with bulk milk somatic cell count (BMSCC). In total, 106 dairy farms in 10 provinces of Canada...more


Heifer rearing conditions affect length of productive life in Swedish dairy cows

Heifer rearing practices may have an influence on performance and longevity in the herd. After feed costs, heifer replacement costs are the largest expense for dairy herds worldwide. Researchers in Sweden evaluated various...more


Evaluation of the California Mastitis Test as a precalving treatment tool for Holstein heifers

Efficacy of precalving intramammary treatment of heifers with antimicrobials can vary among herds and risks for antimicrobial residues exists. California Mastitis testing (CMT), milk electrical conductivity and bacterial culture...more


Periparturient use of parenteral micronized procaine penicillin to reduce the risk of clinical mastitis in heifers after calving

Peripartum mastitis in heifers can be a significant problem for dairy herds, resulting in loss of milk premiums, decreased production and premature culling. Several interventions (prepartum intramammary antimicrobial infusion,...more


Host response in bovine mastitis experimentally induced with Staphylococcus chromogenes

Experimental bovine mastitis models have been developed for many bovine mastitis pathogens (e.g., E. coli, S. aureus, S. uberis); however, none exists for coagulase-negative staphylococci (CNS). The host response to intramammary...more


Heifer teats sprayed in the dry period with an iodine teat sanitizer have reduced Streptococcus uberis teat-end contamination and less Streptococcus uberis intra-mammary infections at calving

The bovine mammary gland is at greater risk for new intramammary infection during the peripartum period and first calf heifers usually have a higher incidence of clinical mastitis early in lactation than older cows. Management...more


Coagulase-negative staphylococci isolated from bovine extramammary sites and intramammary infections in a single dairy herd

Coagulase negative staphylococci (CNS) isolates were obtained from extramammary swab samples on 66 dairy cows (perineum, udder skin, teat apices and streak canal) and compared with bovine mastitis isolates. Species...more


Antimicrobial resistance and genotypic characterization of coagulase-negative staphylococci over the dry period

“Blanket” antimicrobial dry cow therapy (DCT) (where long acting antimicrobials are administered to all cows at dry off regardless of infection status) is practiced in many countries. A study was conducted to determine the...more


A review of prevention and control of heifer mastitis via non-antibiotic strategies

Clinical and subclinical mastitis is a significant problem in first lactation dairy cattle, resulting in substantial financial losses. Mastitis is a multifactorial disease and numerous risk factors and management strategies have...more


Antimicrobial susceptibility of coagulase-negative Staphylococcus isolated from bovine milk

CNS associated with bovine mastitis consist of more than 30 species and subspecies which may have varying levels of resistance to antimicrobials. It has been hypothesized that CNS may serve as a reservoir for the transfer of...more


Teat canal closure in non-lactating heifers and its association with udder health in consecutive lactation

Prevalence of intramammary infection in 1st calf heifers at calving ranges from 18 to 55%. Animal and teat related risk factors have been indentified. In this study from Northern Germany, six dairy herds with more than 50% of...more


Prevalence and herd-level risk factors for intramammary infection with coagulase Prevalence and herd-level risk factors for intramammary infection with coagulase–negative staphylococci

In a Dutch study of 49 dairy herds, the prevalence of coagulase-negative staphylococci (CNS) was estimated. All quarters of high somatic cell count cows (SCC>250K) and high somatic cell count heifers (SCC>150K) were sampled for...more


Fecal shedding of Klebsiella pneumoniae contributes to environmental contamination.

Klebsiella pneumoniae is a common cause of clinical mastitis on well-managed farm and, in the past, bedding derived from wood products has been considered to be the main source. Proposed solutions have included renovating...more


Beta-Hydroxybutyrate (BHBA) levels affect the bactericidal activity of bovine neutrophils against Escherichia coli

Extracellular neutrophils traps (NET), consisting of granule and nuclear neutrophils constituents, have been identified and provide additional microbial killing. This study evaluated the effect of increasing BHBA levels,...more


Escherichia coli mastitis in cattle being treated for Staphylococcus aureus intramammary infection

Six of 23 Holstein cattle enrolled in a trial to evaluate the efficacy of extended intramammary therapy plus vaccination for subclinical Staphylococcus aureus mastitis versus intramammary therapy alone succumbed to acute or...more

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