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Usefulness of differential somatic cell count for udder health monitoring: association of differential somatic cell count and somatic cell score with quarter-level milk yield and milk components.
J Dairy Sci
January 2025
Department of Pathology and Microbiology, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC, Canada; Regroupement FRQNT Op+lait, Saint-Hyacinthe, QC, Canada. Electronic address:
Mastitis is the most common disease affecting dairy cattle and is associated with substantial milk loss. Somatic cell count (SCC) has been widely used as an indicator of udder inflammation (e.g.
View Article and Find Full Text PDFElimination of Methicillin-Resistant from Mammary Glands of Dairy Cows by an Additional Antibiotic Treatment Prior to Dry Cow Treatment.
Microorganisms
December 2024
Department Biological Safety, German Federal Institute for Risk Assessment, 10589 Berlin, Germany.
Methicillin-resistant (MRSA) have been isolated from quarter milk samples of dairy cows, raising concerns over transmission to consumers of raw milk. This study investigates whether pre-treatment before dry-off can increase the success rate of dry cow treatment against MRSA. MRSA positive cows were assigned to two treatment groups.
View Article and Find Full Text PDFUsefulness of differential somatic cell count for udder health monitoring: effect of intramammary infections, days in milk, quarter location, and parity on quarter-level differential somatic cell count and somatic cell score in apparently healthy dairy cows.
J Dairy Sci
December 2024
Department of Pathology and Microbiology, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC, Canada; Regroupement FRQNT Op+lait, Saint-Hyacinthe, QC, Canada. Electronic address:
Microbial infections of the mammary gland often cause mastitis, and it can lead to substantial economic losses within the dairy industry due to its direct negative impact on milk production and composition and the associated treatment costs. Somatic cell count has emerged as a critical indicator in monitoring udder health, and recently, the large-scale availability of differential cell count analysis potentially offers new insights into underlying physiological processes. Therefore, the main objective of this study was to estimate the variation of DSCC and SCC of individual quarter-level milk samples of cows according to 1) their intramammary infectious status; 2) parity of the cow; 3) quarter location; and 4) DIM at the time of sampling.
View Article and Find Full Text PDFUsefulness of differential somatic cell count for udder health monitoring: Identifying referential values for differential somatic cell count in healthy quarters and quarters with subclinical mastitis.
J Dairy Sci
December 2024
Department of Pathology and Microbiology, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC, Canada; Regroupement FRQNT Op+lait, Saint-Hyacinthe, QC, Canada. Electronic address:
Mastitis, an inflammation of the udder primarily caused by an intramammary infection, is one of the most common diseases in dairy cattle. Somatic cell count (SCC) has been widely used as an indicator of udder inflammation, assisting in the detection of subclinical mastitis. More recently, differential somatic cell count (DSCC), which represents the combined proportion of lymphocytes and polymorphonuclear leukocytes, has become available for routine dairy milk screening, though it was not yet widely studied.
View Article and Find Full Text PDFStaphylococci and mammaliicocci: Which species are important for udder health on organic dairy farms?
J Dairy Sci
February 2025
Department of Animal and Veterinary Sciences, University of Vermont, Burlington, VT 05405. Electronic address:
Variation in species distribution and diversity of staphylococci and mammaliicocci (SaM) causing intramammary infections in dairy cattle is associated with different management practices. Disparate selective pressures on organic dairies could potentially result in population differences of these mastitis-causing bacteria. The species-specific effect on quarter SCC of SaM for a population of certified organic dairies has not been described previously.
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