2002, Number 4
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Vet Mex 2002; 33 (4)
Comparative study on the site and digestion rate of N and starch fractions of four steam-flaked cereals in finishing
Plascencia JA, Arellano GE, López SMA, Avery ZR
Language: English/Spanish
References: 56
Page: 371-386
PDF size: 95.44 Kb.
ABSTRACT
Four Holstein steers (157 kg) with cannulas in the rumen and proximal duodenum were used to compare characteristics of digestion of steam-flaked corn, wheat, barley and sorghum. The basal diet contained (DM basis) 81% of grain. Ruminal organic matter (OM) digestibility was lower (P ‹ 0.05) for sorghum than for wheat, and barley (57% vs. 71% and 67%, respectively). Greater (P ‹ 0.05) ruminal starch digestibility was observed for wheat and barley (92%) than for corn and sorghum (83%). Even if there were no differences in postruminal digestion of starch (P › 0.10), postruminal digestibility of OM was lower (P ‹ 0.05) for barley (61%) than for wheat (67%). Ruminal digestion of N was greater (P ‹ 0.05) for wheat (80%) and barley (72%) than for corn (60%) and sorghum (46%). Postruminal digestion of N was greater (P ‹ 0.05) for wheat (79%) than for barley (76%), corn (74%) and sorghum (71%). Total tract digestion of OM was greater (P ‹ 0. 05) for wheat (85%) than for corn (82%), barley (80%), and sorghum (79%). Total tract digestion of starch for all grain was greater than 98%. Dietary digestible energy (DE,Mcal/kg) was greater (P ‹ 0.05) with corn (3.52) and wheat (3.59) than with barley (3.35) and sorghum (3.34). Given that the DE and ruminal undegradable intake protein (UIP) values that the NRC assigns to steam-flaked corn are 4.10 Mcal/kg and 57%, then the corresponding replacement DE and UIP values for steam-flaked wheat, barley, and sorghum obtained in the present study were 4.19 and 21.5 Mcal/kg, 3.89 and 34.8 Mcal/kg, and 3.88 Mcal/kg and 63.4%, respectively. It is concluded that current standards of the NRC significantly underestimate the net energy and ruminal escape protein values of steam-flaked barley, wheat and sorghum.
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