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https://hdl.handle.net/2440/75367
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Type: | Journal article |
Title: | Efficacy of a novel internal dry period teat sealant containing 0.5% chlorhexidine against experimental challenge with Streptococcus uberis in dairy cattle |
Author: | Petrovski, K. Caicedo-Caldas, A. Williamson, N. Lopez-Villalobos, N. Grinberg, A. Parkinson, T. Tucker, I. |
Citation: | Journal of Dairy Science, 2011; 94(7):3366-3375 |
Publisher: | Amer Dairy Science Assoc |
Issue Date: | 2011 |
ISSN: | 0022-0302 1525-3198 |
Statement of Responsibility: | K. R. Petrovski, A. Caicedo-Caldas, N. B. Williamson, N. Lopez-Villalobos, A. Grinberg, T. J. Parkinson, and I. G. Tucker |
Abstract: | The incidence of clinical mastitis and infection status at calving was assessed in quarters treated with 1 of 2 internal teat sealants at the time of dry off. Two contralateral quarters per cow (n = 63 cows) were treated with a sealant that contained 0.5% chlorhexidine; the other quarters were treated with a commercial teat sealant. Ten cows were untreated (controls). On d 2, 4, and 16 after dry off, cows were challenged with Streptococcus uberis S210 strain. Cows were examined daily for 34 d after drying off and cases of clinical mastitis were recorded. Milk samples were collected for culture from any quarters that developed clinical mastitis during the first 34 d after drying-off and from all quarters on d −5 and 0 relative to treatment and at the first and twentieth milking after calving. The incidence of clinical mastitis during the examination period was lower in treated quarters (n = 7/252; 1.5%; lower incidence for those treated with chlorhexidine-containing teat sealant n = 3/126; 1.2%) than in untreated quarters (n = 13/40; 26.8%). The protection against intramammary infection after calving, adjusted for the effect of cow, was higher in quarters treated with the novel teat sealant (89/105; 15.2%; 95% CI = 9.6–23.4) than in those treated with the commercial teat sealant (71/104; 31.7%; 95% CI = 23.5–41.3) and untreated controls (6/28; 78.6%; 95% CI = 59.8–90.0), respectively. Quarters treated with teat sealants were less likely to have an intramammary infection after calving and had a lower incidence of clinical mastitis during the early dry period than did untreated controls in this challenge study. |
Keywords: | internal teat sealant challenge dry period Streptococcus uberis |
Rights: | © American Dairy Science Association®, 2011 |
DOI: | 10.3168/jds.2010-3744 |
Published version: | http://dx.doi.org/10.3168/jds.2010-3744 |
Appears in Collections: | Animal and Veterinary Sciences publications Aurora harvest 4 |
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