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Abstract

Dairy heifers represent the future of a dairy herd, and are expected to freshen with a healthy and well-developed udder, capable of producing an optimal amount of high quality milk. A high proportion of heifers have infected mammary quarters at calving, with coagulase-negative staphylococci (CNS)...

Author(s)
Piepers, S.; Vliegher, S. de; Kruif, A. de; Opsomer, G.; Barkema, H. W.
Publisher
Elsevier, Amsterdam, Netherlands
Citation
Veterinary Microbiology, 2009, 134, 1/2, pp 113-120
Abstract

Non-aureus staphylococci (NAS) are the bacteria most frequently isolated from bovine milk. Objectives of this study were to determine herd-level associations between antimicrobial use (AMU) and prevalence of antimicrobial resistance (AMR) and antimicrobial resistance genes in NAS according to...

Author(s)
Nobrega, D. B.; Buck, J. de; Barkema, H. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 8, pp 7425-7436
Abstract

Staphylococcus species, categorized into Staphylococcus aureus and non-aureus staphylococci (NAS), are frequent causes of mastitis in dairy cattle around the world. Current treatments using antimicrobials are under increasing scrutiny due to rising prevalence of multi-drug resistance in S. aureus....

Author(s)
Qu Yue; Zhao HuaNan; Nobrega, D. B.; Cobo, E. R.; Han Bo; Zhao ZhongHua; Li ShuMei; Li MengYue; Barkema, H. W.; Gao Jian
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 2, pp 1571-1583
Abstract

Mastitis is the most prevalent and costly disease in dairy cattle worldwide, with implications for animal health and welfare as well as production and economics. Nonlactating heifers are an often-neglected group of animals concerning mastitis management, as they are assumed to be free of mastitis....

Author(s)
Naqvi, S. A.; Buck, J. de; Dufour, S.; Barkema, H. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 4, pp 3233-3247
Abstract

Emergence and spread of antimicrobial resistance is a major concern for the dairy industry worldwide. Objectives were to determine: (1) phenotypic and genotypic prevalence of drug-specific resistance for 25 species of non-aureus staphylococci, and (2) associations between presence of resistance...

Author(s)
Nobrega, D. B.; Naushad, S.; Naqvi, S. A.; Condas, L. A. Z.; Saini, V.; Kastelic, J. P.; Luby, C.; Buck, J. de; Barkema, H. W.
Publisher
Frontiers Media S.A., Lausanne, Switzerland
Citation
Frontiers in Microbiology, 2018, 9, February, pp 256
Abstract

Non-aureus staphylococci (NAS), a heterogeneous group of a large number of species and subspecies, are the most frequently isolated pathogens from intramammary infections in dairy cattle. Phylogenetic relationships among bovine NAS species are controversial and have mostly been determined based on...

Author(s)
Naushad, S.; Barkema, H. W.; Luby, C.; Condas, L. A. Z.; Nobrega, D. B.; Carson, D. A.; Buck, J. de
Publisher
Frontiers Media S.A., Lausanne, Switzerland
Citation
Frontiers in Microbiology, 2016, 7, December, pp 1990
Abstract

Heifer mastitis is a disease that potentially threatens production and udder health in the first and subsequent lactations. In general, coagulase-negative staphylococci (CNS) are the predominant cause of intramammary infection and subclinical mastitis in heifers around parturition, whereas ...

Author(s)
Vliegher, S. de; Fox, L. K.; Piepers, S.; McDougall, S.; Barkema, H. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 3, pp 1025-1040
Abstract

Milk losses associated with mastitis can be attributed to either effects of pathogens per se (i.e., direct losses) or effects of the immune response triggered by intramammary infection (indirect losses). The distinction is important in terms of mastitis prevention and treatment. Regardless, the...

Author(s)
Detilleux, J.; Kastelic, J. P.; Barkema, H. W.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Preventive Veterinary Medicine, 2015, 118, 4, pp 449-456
Abstract

Risk factors for intramammary infections caused by coagulase-negative staphylococci, contagious major pathogens and environmental major pathogens in early lactating heifers were evaluated at the herd, heifer and quarter levels. In total, 764 quarters of 191 dairy heifers in 20 randomly selected...

Author(s)
Piepers, S.; Peeters, K.; Opsomer, G.; Barkema, H. W.; Frankena, K.; Vliegher, S. de
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Preventive Veterinary Medicine, 2011, 99, 2/4, pp 91-101
Abstract

Earlier field observations suggest that teat apex colonization by Staphylococcus chromogenes pre-partum in dairy heifers protects udder quarters against elevated somatic cell counts early post-partum. To explain these findings, the in vitro inhibitory capability of S. chromogenes from teat apices...

Author(s)
Vliegher, S. de; Opsomer, G.; Vanrolleghem, A.; Devriese, L. A.; Sampimon, O. C.; Sol, J.; Barkema, H. W.; Haesebrouck, F.; Kruif, A. de
Publisher
Elsevier Science B.V., Amsterdam, Netherlands
Citation
Veterinary Microbiology, 2004, 101, 3, pp 215-221

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