The use of microbial feed additives [probiotics or direct-fed microbials (DFM)] and enzymes in animal diets is not new. In 1924, Eckles and Williams published a report on the use of yeast as a supplementary feed for lactating cows,[1] while in 1947, M0llgaard reported improvements in health and skeletal formation in pigs with impaired mineral absorption supplemented with lactic acid bacil-lus.[2] However, it is only in the last two decades that a clear consensus has started to develop on how addition of such additives to the diet might stimulate productivity in farm animals.

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