Host adapted intramammary infections in pregnant heifers which were co-housed and reared on fresh milk as calves

 

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dc.contributor.author Petzer, Inge-Marie en_ZA
dc.contributor.author Karzis, Joanne en_ZA
dc.contributor.author Lesosky, Maia en_ZA
dc.contributor.author Watermeyer, Johanna en_ZA
dc.contributor.author Badenhorst, Renette en_ZA
dc.date.accessioned 2015-10-28T07:07:40Z
dc.date.available 2015-10-28T07:07:40Z
dc.date.issued 2013 en_ZA
dc.identifier.citation Petzer, I. M., Karzis, J., Lesosky, M., Watermeyer, J. C., & Badenhorst, R. (2013). Host adapted intramammary infections in pregnant heifers which were co-housed and reared on fresh milk as calves. BMC veterinary research, 9(1), 49. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/14475
dc.identifier.uri http://dx.doi.org/10.1186/1746-6148-9-49
dc.description.abstract BACKGROUND:Heifers can calve down with intramammary infections (IMI) and udder damage. This will have a negative impact on their longevity, future milk yield and financial return. Co-housed pre-weaned calves that are fed fresh milk have the opportunity to suckle each other's teats and may infect udders of fellow heifer calves with pathogens present in milk. The prevalence of IMI in pregnant heifers in South Africa (SA) which were co-housed and reared on fresh milk as calves, is not known. Quarter secretion samples from both pregnant heifers (n=2065) and dry cows (n=5365) were collected for microbiological analysis from eight SA dairy herds. All heifers tested in this study were co-housed pre-weaning and were fed fresh milk as calves. RESULTS: The prevalence of coagulase negative staphylococci, Staphylococcus aureus, Streptococcus agalactiae, environmental streptococci, coliforms and samples with no bacterial growth in heifers was 26%, 0.9%, 0.08%, 1.4%, 0.4% and 66%, respectively. The overall prevalence ratio between heifers and cows for Staphylococcus aureus IMI was 0.76 (95% CI: 0.59, 0.98). Four of the individual herds had prevalence ratios of less than one (p<0.05), one herd had a prevalence ratio of 3.15 (95% CI: 1.52, 6.32), and the remaining 3 herds had a prevalence ratio not significantly different from 1.0. Marginally significant differences were found between Staphylococcus aureus IMI in pregnant heifers compared to cows in their second and later lactations (p=0.06, p=0.05, respectively) but no significant differences between heifers and cows in their first lactation. CONCLUSIONS: The presence of Streptococcus agalactiae IMI in heifers came as a surprise, especially as herd infection rates were low. The high prevalence ratio of Staphylococcus aureus between heifers and cows in one herd warrants further investigation due to the potential danger of udder damage in a young cow at the start of her productive life. The IMI in heifers with host adapted pathogens can also act as a source of new IMI for lactating dairy cows. en_ZA
dc.language.iso eng en_ZA
dc.publisher BioMed Central Ltd en_ZA
dc.rights This is an open access article distributed under the terms of the Creative Commons Attribution License en_ZA
dc.rights.uri http://creativecommons.org/licenses/by/2.0 en_ZA
dc.source BMC Veterinary Research en_ZA
dc.source.uri http://www.biomedcentral.com/bmcvetres/ en_ZA
dc.subject.other Heifer intramammary infections en_ZA
dc.subject.other Staphylococcus aureus en_ZA
dc.subject.other Streptococcus agalactiae en_ZA
dc.subject.other Co-housed calves en_ZA
dc.subject.other Fresh milk rearing systems en_ZA
dc.title Host adapted intramammary infections in pregnant heifers which were co-housed and reared on fresh milk as calves en_ZA
dc.type Journal Article en_ZA
dc.rights.holder 2013 Petzer et al.; licensee BioMed Central Ltd en_ZA
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Health Sciences en_ZA
dc.publisher.department Department of Medicine en_ZA
uct.type.filetype Text
uct.type.filetype Image


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This is an open access article distributed under the terms of the Creative Commons Attribution License Except where otherwise noted, this item's license is described as This is an open access article distributed under the terms of the Creative Commons Attribution License