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Bacillus cereus in the housing environment of dairy cows

contamination routes, effect of teat-cleaning, and measures to improve hygiene in the cubicles and alleys

Magnusson, Madeleine (2007). Bacillus cereus in the housing environment of dairy cows. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:42
ISBN 978-91-576-7341-1
[Doctoral thesis]

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The spore-forming bacterium Bacillus cereus can survive pasteurisation and thus a limiting factor for the shelf life of pasteurized milk. The occurrence of B. cereus spores in the housing environment of dairy cows was investigated and the routes of contamination elucidated also measures to improve hygiene in cubicles and alleys were tested. High numbers of spores were found in deep sawdust bedded cubicles hence a source of contamination of milk via soiled teats. In laboratory tests, type of different bedding material, pH, and the availability of nutrient in form of faeces in the beds were shown to be important factors for the growth of B. cereus. In deep sawdust bedded cubicles more frequent adding of fresh bedding and entire bed replacement had a limited effect on reducing spore content in the beds. It was shown by experimentally feeding spores to cows that highly contaminated feed could be a potential source of contamination via faeces and soiled teats. The effects of different premilking teat-cleaning methods were evaluated on experimentally spore contaminated teats. The most effective method in reducing the milk spore content (96 % reduction) was the use of a moist washable towel with or without soap followed by drying with a dry paper towel. Mechanical scrapers on top of the slatted floor reduced the amount of manure on alley floor, hence reducing the faecal contamination in the cubicles, and improving the hygiene score of udder and teats. The drainage capacity of slatted floors was tested in a laboratory arrangement. For loose faeces from high-yielding dairy cows, the greater void ratio the better drainage capacity, irrespective of slat and slot widths was obtained.

Authors/Creators:Magnusson, Madeleine
Title:Bacillus cereus in the housing environment of dairy cows
Subtitle:contamination routes, effect of teat-cleaning, and measures to improve hygiene in the cubicles and alleys
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2007
Number of Pages:47
ALLI. Magnusson, M., Christiansson, A. & Svensson, B. 2007 Bacillus cereus spores during housing of dairy cows: Factors affecting contamination of raw milk. Accepted for publication in Journal of Dairy Science doi:10.3168/ jds.2006-754. II. Magnusson, M., Svensson, B., Kolstrup, C. & Christiansson, A. 2007. Bacillus cereus in free stall bedding. Submitted. III. Magnusson, M., Christiansson, A., Svensson, B. & Kolstrup, C. 2006. Effect of different premilking manual teat-cleaning methods on bacterial spores in milk. Journal of Dairy Science 89:3866-3875. IV. Magnusson, M., Herlin, A.H. & Ventorp, M. 2007. Scrapers on slatted floors for dairy cows: Effect on hygiene. Manuscript. V. Magnusson, M., Ventorp, M. & Nilsson, C. 2007. Drainage capacity of concrete slatted floors for dairy cattle. Submitted.
Place of Publication:Alnarp
ISBN for printed version:978-91-576-7341-1
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:dairy cattle, animal housing, bacillus cereus, milk products, quality, slatted floors, contamination, foods
Keywords:Bacillus cereus spore, bedding material, cleanliness, contamination, dairy cattle, milk quality, slatted floor, scraper, teat cleaning, udder hygiene.
Permanent URL:
ID Code:1402
Department:(LTJ, LTV) > Rural Buildings and Animal Husbandry (until 121231)
Deposited By: Madeleine Magnusson
Deposited On:20 Apr 2007 00:00
Metadata Last Modified:02 Dec 2014 10:11

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