This European Standard defines general rules for the enumeration of probiotic yeasts in feed samples
(additives, premixtures and feeding stuffs) that contain yeast as a single microorganism component or in a
mixture with other microorganisms. The standard is not applicable to mineral feeds which are defined as
complementary feedingstuffs composed mainly of minerals and containing at least 40% crude ash (Council
Directive 79/373/EEC) [4].
There are different categories of feed samples:
a) Additives which contain about 10<(UP)9> CFU/g to 10<(UP)10> CFU/g (CFU = colony forming units):
b) Premixtures which contain about 10<(UP)8>CFU/g,
c) Feeds, meal or pellets, which contain about 10<(UP)6> CFU/g and include complete feedingstuffs, and milk
replacers.
The detection limit is as defined in EN ISO 7218.
BS EN 15789:2009 Referenced Document
EN ISO 6887-1 Microbiology of the food chain - Preparation of test samples, initial suspension and decimal dilutions for microbiological examination - Part 1: General rules for the preparation of the initial suspension and decimal dilutions - Amendment 1: Requirements
EN ISO 7218 Microbiology of food and animal feeding stuffs - General requirements and guidance for microbiological examinations - Amendment 1 (ISO 7218:2007/Amd 1:2013, Corrected version 2014-04-15)*， 2013-08-01 Update
ISO 6498 Animal feeding stuffs - Guidelines for sample preparation*， 2012-06-01 Update
BS EN 15789:2009 history
1970BS EN 15789:2021 Animal feeding stuffs: Methods of sampling and analysis. Detection and enumeration of Saccharomyces cerevisiae used as feed additive (British Standard)
2009BS EN 15789:2009 Animal feeding stuffs - Isolation and enumeration of yeast probiotic strains