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Article: Subclinical and Clinical Mastitis in Heifers Following the Use of a Teat Sealant Precalving
- Article from:
- Journal of Dairy Science
- Article date:
- January 1, 2007
- Author:
CopyrightCopyright American Dairy Science Association Jan 2007. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
This study investigated the effect in heifers of infusion of a bismuth subnitrate teat-canal sealant and bacterial intramammary infection (IMI) precalving on prevalence of postcalving IMI and incidence of clinical mastitis in the first 2 wk postcalving. Glands (n = 1,020) from heifers (n = 255) in 5 seasonally calving, pasture-fed dairy herds were randomly assigned within heifer to 1 of 4 treatment groups (no treatment; mammary gland secretion collection; infusion of a teat sealant; or sample collection with infusion of teat sealant). Heifers within a herd were enrolled on one calendar day, 31 d on average before the planned start of the seasonal calving period. Duplicate milk ...