Article (Scientific journals)
Milk prolactin response and quarter milk yield after experimental infection with coagulase-negative staphylococci in dairy heifers.
Piccart, K.; Piepers, S.; Verbeke, J. et al.
2015In Journal of Dairy Science, 98 (7), p. 4593-4600
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Keywords :
coagulase-negative staphylococci; dairy heifer; experimental mastitis; prolactin
Abstract :
[en] Coagulase-negative staphylococci (CNS) are the most common bacteria involved in subclinical mastitis in dairy cows. Remarkably, CNS-infected dairy heifers produce more milk than uninfected heifers. Because the lactation hormone prolactin (PRL) is also involved in mammary gland immunity, we investigated the milk PRL response and the mammary quarter milk yield following experimental CNS challenge. Eight healthy Holstein-Friesian heifers in mid-lactation were experimentally infected using a split-udder design with 3 different CNS strains: one Staphylococcus fleurettii (from sawdust bedding) and 2 Staphylococcus chromogenes strains (one isolate from a teat apex, the other isolate from a chronic intramammary infection). Three mammary quarters per heifer were simultaneously inoculated with 1.0x10(6) cfu, whereas the remaining mammary quarter was infused with sterile phosphate-buffered saline, serving as a control. An existing radioimmunoassay was modified, validated, and used to measure PRL frozen-thawed milk at various time points until 78h after challenge. The mean milk PRL level tended to be higher in the CNS-challenged mammary quarters compared with the control mammary quarters (7.56 and 6.85ng/mL, respectively). The increase in PRL over time was significantly greater in the CNS-challenged mammary quarters than in the control mammary quarters. However, no difference was found in the PRL response when comparing each individual CNS strain with the control mammary quarters. The mean mammary quarter milk yield tended to be lower in the CNS-infected mammary quarters than in the control mammary quarters (1.73 and 1.98kg per milking, respectively). The greatest milk loss occurred in the mammary quarters challenged with the intramammary strain of S. chromogenes. Future observational studies are needed to elucidate the relation between PRL, the milk yield, and the inflammatory condition, or infection status, of the mammary gland.
Research center :
FARAH - Fundamental and Applied Research for Animals and Health - ULiège
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Piccart, K.;  Ghent University, 9820 Merelbeke, Belgium > M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine
Piepers, S.;  Ghent University, 9820 Merelbeke, Belgium > M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine
Verbeke, J.;  Ghent University, 9820 Merelbeke, Belgium > M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine
Melo de Sousa, Noelita ;  Université de Liège > Département des sciences fonctionnelles (DSF) > Département des sciences fonctionnelles (DSF)
Beckers, Jean-François  ;  Université de Liège > Département des sciences fonctionnelles (DSF) > Département des sciences fonctionnelles (DSF)
De Vliegher, S.;  Ghent University, 9820 Merelbeke, Belgium > M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine
Language :
English
Title :
Milk prolactin response and quarter milk yield after experimental infection with coagulase-negative staphylococci in dairy heifers.
Publication date :
2015
Journal title :
Journal of Dairy Science
ISSN :
0022-0302
eISSN :
1525-3198
Publisher :
American Dairy Science Association, United States - Illinois
Volume :
98
Issue :
7
Pages :
4593-4600
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 March 2016

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