Reading fiber fractions

Spot it

1. Sign 01Two forages have similar NDF but different intakeClose

   MeaningDigestibility, uNDF, rate, chop, fragility, or fermentation may differ.

   Next checkCompare NDFD at the same time point, uNDF, lignin, particle form, and actual intake.

Compare

• Amount vs behavior

  NDF

  • Amount of cell wall
  • Expressed as feed concentration

  NDFD

  • Fraction of NDF disappearing
  • Requires an incubation time

  One does not substitute for the other.

Field notes on this focus

1. Note 01The same NDF can describe a different forageNDF gives cell-wall amount; digestibility, lignin, uNDF, rate, and particle form determine how that wall behaves.4 min · 2026-09-17

Also touches this focus

1. Note 01Chemical fiber is not effective fiberGrinding can leave the NDF percentage intact while removing much of the particle structure that stimulates chewing.4 min · 2026-09-17
2. Note 02Never drop the digestibility clockNDFD30 and NDFD48 are different measurements because the microbes had different amounts of time.4 min · 2026-09-17
3. Note 03Chop length is not peNDFChop length is a harvester setting; peNDF is the fiber structure that actually reaches the rumen after moisture, processing, mixing, and sorting.3 min · 2026-09-10
4. Note 04Read manure before you rewrite the ticketThe alley is a daily report card on the ration the cow actually ate and fermented — consistency, fiber, and grain tell you before the mixer does.3 min · 2026-09-09