Which of these would not apply to direct-fed microbials (DFMs)?

  • Live, naturally occurring microorganisms
  • Part of the normal flora of the GI tract
  • Used to provide microbial balance in the digestive tract
  • Non-viable, synthetic feed additives


In the US, Association of American Feed Control Officials (AAFCO) and the FDA recognize a list of microorganisms appropriate for animal feeds.   Direct-fed microbials have been long been utilized for a variety of animal health and production purposes. The term probiotic is often used interchangeably with DFM.