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In animals: A system for comparing animals with a herd, or area, based on the average of the group; usually the figure 100 is used for an average index; animals receiving an index of 100 or over are the top end while those indexing less than 100 are the bottom end.
In plants: Determination of the presence of disease by removing buds or other parts for inoculation of a susceptibe indicator plant that exhibits specific symptoms of a transmissible disease.
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