One of the biggest advancements in feed analysis from our forage testing labs has been the addition of uNDF240 as a measure of indigestibility. While NDFD30 is an estimate of the amount of fiber digested in 30 hours of contact with rumen fluid, uNDF240 is the amount that is undigested in 240 hrs. The concept is that after 10 days in rumen fluid the remaining fiber will not digest further. This Continue Reading