A	additive ratio (%)
d	pellet diameter (mm)
dm	die diameter (mm)
E	elasticity modulus for pellet compression (MPa)
Ej	specific pellet compression work (mJ·mm−2)
F, Fmax	compaction force; current and maximum, respectively (N)
Fc, Fcm	compressive force; in the elastic loading range and maximum, respectively (N)
k, ku	water absorption by crushed and uncrushed pellets, respectively (g H2O·g−1 DM) (DM—dry matter)
la	agglomerate length (mm)
lc	die height (mm)
lp	pellet length (mm)
Ls	specific compaction work (kJ·kg−1)
Lv	specific work for pellet shift in the die (kJ·kg−1)
MC	moisture content (% wb)
ms0, ms1	weight of the pellet sample before and after soaking in water, respectively (g)
p	compaction pressure (MPa)
pm	maximum agglomeration pressure (MPa)
se	end piston displacement (mm)
sm	piston displacement at maximum agglomeration pressure (mm)
t	material temperature (°C)
vp	pellet shift in the die (mm)
x	fraction particle size, geometric mean of particle size (mm)
Δl	pellet deformation under load (mm)
ρp	DM single pellet density (kg·m−3)
σc	tensile strength (MPa)
CC	calcium carbonate
CS	cassava starch
WS	wheat straw