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dc.contributor.authorMcParland, Sinead
dc.contributor.authorDillon, Pat
dc.contributor.authorFlynn, James
dc.contributor.authorRyan, N.
dc.contributor.authorArkins, S.
dc.contributor.authorKennedy, Aideen E.
dc.date.accessioned2019-09-17T15:05:53Z
dc.date.available2019-09-17T15:05:53Z
dc.date.issued2019-03-14
dc.identifier.citationMcParland, S., Dillon, P., Flynn, J., Ryan, N., Arkins, S. and Kennedy, A. Effect of using internal teat sealant with or without antibiotic therapy at dry-off on subsequent somatic cell count and milk production. Journal of Dairy Science, 2019, 102(5), 4464-4475. doi: https://dx.doi.org/10.3168/jds.2018-15195en_US
dc.identifier.urihttp://hdl.handle.net/11019/1784
dc.descriptionpeer-revieweden_US
dc.description.abstractThe objective of this study was to assess the effect of treating cows with teat sealant only compared with antibiotic plus teat sealant at drying off on weekly somatic cell count, potential intramammary infection, and milk production across the entire subsequent lactation. In 3 research herds in the south of Ireland, cows with SCC that did not exceed 200,000 cells/mL in the previous lactation (LowSCC) were randomly assigned to 1 of 2 treatments at drying off: internal teat sealant alone (ITS) or antibiotic plus teat sealant (AB+ITS). Cows with SCC that exceeded 200,000 cells/mL in the previous lactation were treated with AB+ITS and included in the analyses as a separate group (HighSCC). Weekly individual animal composite SCC records were available for 654 cow lactations and were transformed to somatic cell scores (SCS) for the purpose of analysis. Data were divided into 3 data sets to represent records obtained (1) up to 35 DIM, (2) up to 120 DIM, and (3) across the lactation. Foremilk secretions were taken from all quarters at drying off, at calving, 2 wk after calving, and in mid-lactation and were cultured to detect the presence of bacteria. The LowSCC cows treated with ITS alone had higher daily milk yield (0.67 kg/d) across lactation compared with LowSCC cows treated with AB+ITS. The LowSCC cows treated with ITS alone had higher SCS in early, up to mid, and across lactation compared with LowSCC cows treated with AB+ITS. We detected no difference in weekly SCS of LowSCC cows treated with ITS alone and SCS of HighSCC cows. The least squares means back-transformed SCC across lactation of the LowSCC cows treated with ITS alone, LowSCC cows treated with AB+ITS, and HighSCC cows were 41,523, 34,001, and 38,939 cells/mL respectively. The odds of LowSCC cows treated with ITS alone having bacteria present in their foremilk across lactation was 2.7 (95% confidence interval: 1.91 to 3.85) and 1.6 (1.22 to 2.03) times the odds of LowSCC cows treated with AB+ITS and of HighSCC cows treated with AB+ITS, respectively. In this study, Staphylococcus aureus was the most prevalent pathogen isolated from the population. Recategorizing the threshold for LowSCC cows as ≤150,000 cells/mL or ≤100,000 cells/mL in the previous lactation had no effect on the results. The results indicate that herds with good mastitis control programs may use ITS alone at dry-off in cows with SCC <200,000 cells/mL across lactation with only a small effect on herd SCC.en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesJournal of Dairy Science;Vol. 102 (5)
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectteat sealanten_US
dc.subjectdry-offen_US
dc.subjectintramammary infectionen_US
dc.subjectmastitis controlen_US
dc.titleEffect of using internal teat sealant with or without antibiotic therapy at dry-off on subsequent somatic cell count and milk productionen_US
dc.typeArticleen_US
dc.embargo.terms2020-03-14en_US
dc.identifier.doihttps://dx.doi.org/10.3168/jds.2018-15195
dc.contributor.sponsorDairy Research Irelanden_US


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    Teagasc LIvestock Systems Department includes Dairy, Cattle and Sheep research.

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Attribution-NonCommercial-ShareAlike 3.0 United States
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