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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 71, No. 3, 2011, pp. 430-436
Bioline Code: cj11054
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 71, No. 3, 2011, pp. 430-436

 en RUMINAL DEGRADABILITY OF DRY MATTER AND CRUDE PROTEIN FROM MOIST DEHULLED LUPIN AND EXTRUDED RAPESEED MEAL
Barchiesi-Ferrari, Claudia & Anrique, René

Abstract

The flow of ruminal undegradable protein (RUP) to the small intestine can be increased if ruminal degradation of dietary protein is reduced. The objective of this study was to evaluate the effect of extrusion on ruminal degradability of dry matter (DM) and crude protein (CP) from dehulled lupin ( Lupinus albus check for this species in other resources L.) (DL) and rapeseed ( Brassica napus check for this species in other resources L.) meal (RM). Unextruded soybean ( Glicine max check for this species in other resources L.) meal (SBM) was used as a control. The DL was extruded at 130 °C with 20% moisture and RM was extruded at 120 °C with 20% moisture. Ruminal degradability was evaluated in situ by incubating feed samples for 2, 4, 8, 12, 24, and 48 h of fermentation in the rumen using three rumen-fistulated dairy cows. Values of CP soluble fraction ("a") in SBM, DL, extruded dehulled lupin (EDL), RM, and extruded rapeseed meal (ERM) was lower in the extruded feeds (P < 0.05). The slowly degradable fraction ("b") of SBM, DL, EDL, RM, and ERM was 858, 593, 622, 451, and 457 g kg-1, respectively, and was increased by extrusion (P < 0.05). Extrusion reduced the effective degradability (ED) of CP in lupin from 807 to 788 g kg-1; kp = 0.05 h-1 while ED was reduced from 868 to 789 g kg-1; kp = 0.05 h-1 in ERM. This resulted in an increase in RUP of 8.95% in EDL (P < 0.05); the increase was 37.35% (P < 0.05) in ERM. It may be concluded that extrusion in the presence of moisture reduced the degradability of CP, particularly in the case of ERM.

Keywords
Extrusion, protein supplements, protein degradation, soybean meal, cattle

 
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