Feed samples are tested for bacterial contamination, they should not be taken from feed troughs or from under heaters. It is a sound practice to hold part of the final sample in storage for reference as needed. Incremental samples may be taken from bulk or bagged material by the use of a sampling spear (grain probe).
In the UK the correct procedure is defined in The Feeding Stuffs (Sampling and Analysis) Regulations 1982 (Statutory Instrument 1982 No 1144 Agriculture).
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