The value for AMTS Rumen pH < 5.8 is from an equation. This equation was adapted from Zebeli et. al. JDS 91:2046 (2008). It is calculated from peNDF and rumen degraded starch from concentrates. Their data showed a breakpoint where daily mean rumen pH decreased in a linear fashion as the number of hours below 5.8 increased starting around 4 hrs. This result is shown in outputs in AMTS.Cattle Recipes screen

Graph showing the relationship between rumen pH and time from Zebeli, et al

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