California Mastitis Test

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The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform

Claro N. Mingala - One of the best experts on this subject based on the ideXlab platform.

K E Leslie - One of the best experts on this subject based on the ideXlab platform.

  • Test characteristics from latent class models of the California Mastitis Test
    Preventive Veterinary Medicine, 2006
    Co-Authors: C J Sanford, G P Keefe, J Sanchez, R T Dingwell, H W Barkema, K E Leslie, I R Dohoo
    Abstract:

    We evaluated (using latent-class models) the ability of the California Mastitis Test (CMT) to identify cows with intramammary infections on the day of dry-off. The positive and negative predictive values of this Test to identify cows requiring dry-cow antibiotics (i.e. infected) was also assessed. We used 752 Holstein-Friesian cows from 11 herds for this investigation. Milk samples were collected for bacteriology, and the CMT was performed cow-side, prior to milking on the day of dry-off. At the cow-level, the sensitivity and specificity of the CMT (using the four quarter results interpreted in parallel) for identifying all pathogens were estimated at 70 and 48%, respectively. If only major pathogens were considered the sensitivity of the CMT increased to 86%. The negative predictive value of the CMT was >95% for herds with major-pathogen intramammary-infection prevalence <15%, so that selective dry-cow therapy might be reasonable for such herds if cows were screened with the CMT.

  • Test characteristics from latent-class models of the California Mastitis Test.
    Preventive veterinary medicine, 2006
    Co-Authors: C J Sanford, G P Keefe, J Sanchez, R T Dingwell, H W Barkema, K E Leslie, I R Dohoo
    Abstract:

    We evaluated (using latent-class models) the ability of the California Mastitis Test (CMT) to identify cows with intramammary infections on the day of dry-off. The positive and negative predictive values of this Test to identify cows requiring dry-cow antibiotics (i.e. infected) was also assessed. We used 752 Holstein-Friesian cows from 11 herds for this investigation. Milk samples were collected for bacteriology, and the CMT was performed cow-side, prior to milking on the day of dry-off. At the cow-level, the sensitivity and specificity of the CMT (using the four quarter results interpreted in parallel) for identifying all pathogens were estimated at 70 and 48%, respectively. If only major pathogens were considered the sensitivity of the CMT increased to 86%. The negative predictive value of the CMT was >95% for herds with major-pathogen intramammary-infection prevalence

  • evaluation of the California Mastitis Test to detect an intramammary infection with a major pathogen in early lactation dairy cows
    Canadian Veterinary Journal-revue Veterinaire Canadienne, 2003
    Co-Authors: R T Dingwell, K E Leslie, Y H Schukken, Jan M Sargeant, Leo L Timms
    Abstract:

    The purpose of this study was to evaluate the usefulness of the California Mastitis Test (CMT) to detect an intramammary infection caused by a major Mastitis pathogen in early lactation cows. The gold standard used for comparison was bacteriological culture of single milk samples. The sensitivity (82.4%) and specificity (80.6%) of a positive CMT were highest on the 4th day of lactation.

  • sensitivity and specificity of somatic cell count and California Mastitis Test for identifying intramammary infection in early lactation
    Journal of Dairy Science, 2001
    Co-Authors: Jan M Sargeant, K E Leslie, J E Shirley, B J Pulkrabek, G H Lim
    Abstract:

    Associations between values for the somatic cell count (SCC) or the California Mastitis Test (CMT) and intramammary infection (IMI) were studied in 131 dairy cows from three herds during the first 10 d postcalving. Intramammary infection was defined as the presence of one or two bacterial species in one or both quarter milk samples taken within 12 h of calving and at d 3 postcalving. Quarter milk samples identified IMI in 36% of glands. Values for SCC declined at a significantly faster rate over the first 10 d postcalving in non-infected quarters than in infected quarters. The usefulness of quarter milk SCC and CMT for screening was evaluated by calculating the sensitivity and specificity for various threshold values and days postcalving. A SCC threshold of 100,000 cells/ml for quarter samples evaluated on d 5 postcalving had the maximal sensitivity and specificity for detecting IMI. Evaluation of the CMT samples taken on d 3 postcalving using a threshold reaction of greater than zero had the highest sensitivity and specificity for detecting IMI. With this CMT sampling scheme, the sensitivities for detecting IMI with any pathogen, IMI with a major pathogen, and IMI with a minor pathogen were 56.7, 66.7, and 49.5, respectively. The CMT could have a useful role in dairy herd monitoring programs as a screening Test to detect fresh cows with IMI caused by major pathogens.

Roderick T. Salvador - One of the best experts on this subject based on the ideXlab platform.

I R Dohoo - One of the best experts on this subject based on the ideXlab platform.

  • Test characteristics from latent class models of the California Mastitis Test
    Preventive Veterinary Medicine, 2006
    Co-Authors: C J Sanford, G P Keefe, J Sanchez, R T Dingwell, H W Barkema, K E Leslie, I R Dohoo
    Abstract:

    We evaluated (using latent-class models) the ability of the California Mastitis Test (CMT) to identify cows with intramammary infections on the day of dry-off. The positive and negative predictive values of this Test to identify cows requiring dry-cow antibiotics (i.e. infected) was also assessed. We used 752 Holstein-Friesian cows from 11 herds for this investigation. Milk samples were collected for bacteriology, and the CMT was performed cow-side, prior to milking on the day of dry-off. At the cow-level, the sensitivity and specificity of the CMT (using the four quarter results interpreted in parallel) for identifying all pathogens were estimated at 70 and 48%, respectively. If only major pathogens were considered the sensitivity of the CMT increased to 86%. The negative predictive value of the CMT was >95% for herds with major-pathogen intramammary-infection prevalence <15%, so that selective dry-cow therapy might be reasonable for such herds if cows were screened with the CMT.

  • Test characteristics from latent-class models of the California Mastitis Test.
    Preventive veterinary medicine, 2006
    Co-Authors: C J Sanford, G P Keefe, J Sanchez, R T Dingwell, H W Barkema, K E Leslie, I R Dohoo
    Abstract:

    We evaluated (using latent-class models) the ability of the California Mastitis Test (CMT) to identify cows with intramammary infections on the day of dry-off. The positive and negative predictive values of this Test to identify cows requiring dry-cow antibiotics (i.e. infected) was also assessed. We used 752 Holstein-Friesian cows from 11 herds for this investigation. Milk samples were collected for bacteriology, and the CMT was performed cow-side, prior to milking on the day of dry-off. At the cow-level, the sensitivity and specificity of the CMT (using the four quarter results interpreted in parallel) for identifying all pathogens were estimated at 70 and 48%, respectively. If only major pathogens were considered the sensitivity of the CMT increased to 86%. The negative predictive value of the CMT was >95% for herds with major-pathogen intramammary-infection prevalence

Baldassare Portolano - One of the best experts on this subject based on the ideXlab platform.

  • receiver operating characteristic curves for somatic cell scores and California Mastitis Test in valle del belice dairy sheep
    Veterinary Journal, 2013
    Co-Authors: Valentina Riggio, Lorenzo Luigi Pesce, Salvatore Morreale, Baldassare Portolano
    Abstract:

    Using receiver-operating characteristic (ROC) curve methodology this study was designed to assess the diagnostic effectiveness of somatic cell count (SCC) and the California Mastitis Test (CMT) in Valle del Belice sheep, and to propose and evaluate threshold values for those Tests that would optimally discriminate between healthy and infected udders. Milk samples (n=1357) were collected from 684 sheep in four flocks. The prevalence of infection, as determined by positive bacterial culture was 0.36, 87.7% of which were minor and 12.3% major pathogens. Of the culture negative samples, 83.7% had an SCC<500,000/mL and 97.4% had <1,000,000cells/mL. When the associations between SC score (SCS) and whole sample status (culture negative vs. infected), minor pathogen status (culture negative vs. infected with minor pathogens), major pathogen status (culture negative vs. infected with major pathogens), and CMT results were evaluated, the estimated area under the ROC curve was greater for glands infected with major compared to minor pathogens (0.88 vs. 0.73), whereas the area under the curve considering all pathogens was similar to the one for minor pathogens (0.75). The estimated optimal thresholds were 3.00 (CMT), 2.81 (SCS for the whole sample), 2.81 (SCS for minor pathogens), and 3.33 (SCS for major pathogens). These correctly classified, respectively, 69.0%, 73.5%, 72.6% and 91.0% of infected udders in the samples. The CMT appeared only to discriminate udders infected with major pathogens. In this population, SCS appeared to be the best indirect Test of the bacteriological status of the udder.

  • Receiver-operating characteristic curves for somatic cell scores and California Mastitis Test in Valle del Belice dairy sheep
    Veterinary journal (London England : 1997), 2013
    Co-Authors: Valentina Riggio, Lorenzo Luigi Pesce, Salvatore Morreale, Baldassare Portolano
    Abstract:

    Using receiver-operating characteristic (ROC) curve methodology this study was designed to assess the diagnostic effectiveness of somatic cell count (SCC) and the California Mastitis Test (CMT) in Valle del Belice sheep, and to propose and evaluate threshold values for those Tests that would optimally discriminate between healthy and infected udders. Milk samples (n=1357) were collected from 684 sheep in four flocks. The prevalence of infection, as determined by positive bacterial culture was 0.36, 87.7% of which were minor and 12.3% major pathogens. Of the culture negative samples, 83.7% had an SCC

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