Influence of processing method on comparative digestion of white corn vs. conventional steam-flaked yellow dent corn in finishing diets for feedlot cattle.
Summary of "Influence of processing method on comparative digestion of white corn vs. conventional steam-flaked yellow dent corn in finishing diets for feedlot cattle."
Four Holstein steers (137 ± 2 kg) with cannulas in the rumen and proximal duodenum were used in a 4x4 Latin square design to evaluate the influence of processing method on comparative digestion of white corn. Treatments consisted of a basal finishing diet containing 80% corn grain (DM basis) as: 1) dry-rolled white corn (DRWC), 2) steam-flaked white corn, 0.36 kg/L flake density (SFWC36) 3) steam-flaked white corn, 0.31 kg/L flake density (SFWC31), and 4) steam-flaked yellow corn, 0.31 kg/L flake density (SFYC31). Characteristics of ruminal, postruminal and apparent total tract digestion of OM, starch, and N were similar for SFYC31 and SFWC31 treatments. Decreasing flake density of white corn (from 0.36 to 0.31 kg/L) did not affect ruminal OM digestion, but increased (1.9%, P = 0.07) apparent total tract OM digestion. Compared with dry rolling, steam flaking WC increased ruminal (9.4%, P = 0.05), postruminal (14.4%, P < 0.01) and apparent total tract OM digestion (8.2%, P < 0.01), reflecting corresponding increases in ruminal (13.3%, P < 0.01), postruminal (43%, P < 0.01) and apparent total tract (12.3%, P < 0.01) starch digestion. Apparent postruminal and apparent total-tract N digestion also were greater (6.5 and 5.6%, respectively, P = 0.04) for SFWC than for DRWC. The DE value of SFWC and SFYC diets were similar, averaging 3.39 Mcal/kg. The DE value of SFWC was greater (8.1%, P < 0.01) than that of DRWC. Ruminal pH (4 h postprandial) averaged 5.74, and was not affected by dietary treatments. Compared with dry rolling, steam flaking markedly enhances the feeding value of white corn, optimal flake density being less than 0.36 kg/L. Although white corn has greater vitreous endosperm content, characteristics of ruminal starch digestion and UIP are similar to conventional yellow dent corn when processed to a similar flake density (0.31 kg/L). However, postruminal and apparent total tract starch digestion tends to be slightly lower for flaked white corn than for yellow corn.
Universidad Autónoma de Baja California, Mexicali, Baja California, México.
This article was published in the following journal.
Name: Journal of animal science
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20833768
- DOI: http://dx.doi.org/10.2527/jas.2010-3116
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