Isolation of Aerobic Bacterial Species Associated with Palpable Udder Defects in Non-Dairy Ewes.

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dc.citation.issue16
dc.citation.volume14
dc.contributor.authorZeleke MM
dc.contributor.authorKenyon PR
dc.contributor.authorFlay KJ
dc.contributor.authorAberdein D
dc.contributor.authorPain SJ
dc.contributor.authorVelathanthiri N
dc.contributor.authorRidler AL
dc.contributor.editorZecconi A
dc.coverage.spatialSwitzerland
dc.date.accessioned2024-10-03T02:20:20Z
dc.date.available2024-10-03T02:20:20Z
dc.date.issued2024-08-09
dc.description.abstractThe objectives of these studies were to identify associations between udder half defects (hard or lump) and bacteria isolated from milk or mammary tissue swabs, to compare with samples from normal udder halves at different physiological time points and to compare bacterial species isolated via milk and swabs of mammary tissue from within the same udder halves. A total of 1054 samples were aseptically collected from each udder half of 199 non-dairy breed (Romney) ewes from three different studies (Study A, n = 77; Study B, n = 74; and Study C, n = 48). Conventional bacterial culture and MALDI-ToF mass spectrometry were used for bacterial identification. Of the 225 samples from which bacteria were isolated, Mannheimia haemolytica and Streptococcus uberis were the dominantly identified species from defective udder halves, whereas coagulase-negative staphylococcus (CNS) species, mostly Staphylococcus simulans and Staphylococcus chromogenes, were more frequently isolated from normal udder halves. The ongoing presence of bacterial species over time was variable, although less frequently identified species showed less stability over time. A very high agreement (91.5%) of bacterial species identified was observed between the mammary tissue swab and udder half milk samples during post-weaning. In summary, palpable udder half defects were associated with bacterial positivity, and the ongoing presence of the bacteria over time was dependent on the species involved. Hence, culling ewes with palpable udder half defects that had more stable bacterial species could contribute to reducing the recurrence of palpable defects or mastitis.
dc.description.confidentialfalse
dc.edition.editionAugust-2 2024
dc.format.pagination2317-
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/39199850
dc.identifier.citationZeleke MM, Kenyon PR, Flay KJ, Aberdein D, Pain SJ, Velathanthiri N, Ridler AL. (2024). Isolation of Aerobic Bacterial Species Associated with Palpable Udder Defects in Non-Dairy Ewes.. Animals (Basel). 14. 16. (pp. 2317-).
dc.identifier.doi10.3390/ani14162317
dc.identifier.eissn2076-2615
dc.identifier.elements-typejournal-article
dc.identifier.issn2076-2615
dc.identifier.number2317
dc.identifier.piiani14162317
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71589
dc.languageeng
dc.publisherMDPI (Basel, Switzerland)
dc.publisher.urihttps://www.mdpi.com/2076-2615/14/16/2317
dc.relation.isPartOfAnimals (Basel)
dc.rights(c) 2024 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectbacteria
dc.subjecthard udder
dc.subjectnon-dairy ewe
dc.subjectpalpable udder defect
dc.subjectudder lump
dc.titleIsolation of Aerobic Bacterial Species Associated with Palpable Udder Defects in Non-Dairy Ewes.
dc.typeJournal article
pubs.elements-id491396
pubs.organisational-groupCollege of Health
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