C. Barchiesi, P. Williams, and A. Velásquez. 2018. Extrusion of lupin and pea decrease the
ruminal degradability improving true ileal digestibility of crude protein. Cienc. Inv. Agr.
45(3): 231-239. The aim of this work was to evaluate the effect of the extrusion of dehulled
lupins (Lupinus albus L.) and peas (Pisum sativum L.) on the ruminal degradability and
intestinal digestibility of their protein contents. Ruminal degradability was evaluated in situ in
the rumens of two fistulated cows. The true ileal crude protein (CP) digestibility was evaluated
via a bioassay with Sprague Dawley laboratory rats as the animal model. Extrusion caused
soluble fraction decreases in both feeds (P<0.05), with a 29 % decrease in the extruded dehulled
lupins (EDL) and a 59 % decrease in the extruded peas (EP). The degradable fraction (B) in
EP increased by 19 % compared to that in raw peas (RP) (P<0.05), and there was no effect
of extrusion on the degradable fraction in lupins (P>0.05). Extrusion decreased the effective
degradability (ED) of lupins by 12 % (P<0.05). Moreover, in EP, extrusion presented no effect
on the ED (P>0.05). The extrusion process had a greater impact on the reduction of the effective
degradability in lupins than it did in peas. Nevertheless, extrusion increased the true ileal CP
digestibility of the ruminal postfermentation residues in both feeds.