Table 1
Particle size distribution, physical effectiveness factors (pef), and physically effective fiber (peNDF) content of the feeds

Item	Rice straw	BF-based silage1)	Alfalfa hay	Concentrate mix
% dry matter (DM) retained on sieves
Above 19.0 mm	97.8	10.3	45.8	0.8
8.0–19.0 mm	1.2	8.2	10.7	53.9
1.18–8.0 mm	0.9	54.6	26.2	45.1
Below 1.18 mm	0.1	26.9	17.3	0.2
Pef8.0	99.0	18.5	56.5	53.9
pef1.18	99.9	73.1	82.7	39.4
peNDF8.0, % of DM	71.2	9.4	27.7	17.6
peNDF1.18, % of DM	71.8	37.0	40.6	12.9