Sample the total mixed ration or grain and forages separately when fed conventionally. Mycotoxin content is not related to the amount of mold present. Mycotoxins are not necessarily evenly distributed in the affected feed. Isolated pockets may exist. Some mycotoxins could develop during lengthy transit to the laboratory.
Some mycotoxins continue to be produced in storage, particularly unfavourable storage.
For example dry grains, protein supplements, dry hay and concentrates. For example TMR, corn silage, haylage and high moisture grains. Judgement call as how best to handle. If in doubt, it is safer to handle as a wet feed. Mix the subsamples well, take a 500g composite sample and store in a cool dry place.