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Associations Between Teat End Condition and Somatic Cell Counts in NZ Dairy Herds
Hawkins D.
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Objectives:
AIMS: The aims of the study were to determine associations of hyperkeratosis at a herd level with Bulk Milk Somatic Cell Count in NZ dairy herds. Methods:
METHODS:
Teat end scores of cows from 47 (39 spring and 8 split calving) dairy herds were examined. Herds were categorised as either ‘problem herds', those seeking professional help (n = 32), or ‘control herds', those selected from the FranklinVets database on the basis that the BMSCC was <254,000 cells/mL and they were willing to cooperate (n =15). Herds were visited during a single milking by one veterinarian during the lactation. (Day 153 on average; SD = 84; range = 26 to 357). Teat end hyperkeratosis was scored using the Mein et al (2001) teat end scoring system and categorised as normal (No ring and smooth), rough or very rough. An average of 75 cows (SD = 23; range = 24 to 181) were scored in each herd. Herd level milk production data was retrieved from an electronic database (fonterra.co.nz). The arithmetic mean bulk milk somatic cell count (BMSCC) was calculated for each herd for the 3 calendar months preceding the veterinary visit. Data were entered into a Microsoft Excel spread sheet and then analysed in IBM SPSS v20 using bivariate associations, general linear modelling and receiver operator curves (ROC) to test associations between BMSCC, herd size, herd category, stage of lactation at visit and prevalence of quarter and cow level hyperkeratosis. For the cow-level analysis, the highest score of any of the teat ends within a cow was the score assigned. This study was funded by Boerhinger-Ingelheim with support from FranklinVets and Cognosco. […]
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Affiliation of the authors at the time of publication
Franklin Vets, Waiuku, New Zealand
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