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Journal of Dairy Science Vol. 98 No. 9, 2015
UPDATING AND ASSESSING THE CNCPS FEED LIBRARY
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forces equation [16] to a sum >100% DM leads to an
overestimation of fecal appearance and an underestima-
tion of apparent TDN. Further, because soluble fiber
is also calculated by difference (equation [5]; Table 2),
an increase in the concentration of any component less
digestible than soluble fiber (i.e., NDF) results in an
increase in fecal nutrient appearance and decrease in
apparent TDN. For these reasons, ensuring laboratory
results are internally consistent and adhering to the
framework of equation [16] is critical for the accurate
prediction of ME. Furthermore, due to the potential to
obscure the true NDF content of forages, the adoption
Figure 8.
Frequency distributions generated from a Monte Carlo simulation for selected chemical components in the reference diet. Each
graph displays the range of possible outcomes for each component and the relative likelihood of occurrence. EE = ether extract.