The same fraction was calculated to 0.9 for goats (Pfeffer, 1989). Correlating the inevitable
loss to DM intake would be reasonable, as the microbial flow would increase with intake.
However, there might be differences in this inevitable loss due to variations in diet. High
forage diets stimulate saliva secretion and rumen microbial flow more than low forage diets
with the same intake level and this influences faecal P excretion. Determinations of ADP
corrected for this inevitable loss could give valuable information concerning P availability
from different sources. However, dietary levels should be low enough to avoid large amounts
of excess P (fraction c) in the faeces