Practical parameters for assessing starch digestion and feeding value of steam-flaked corn in finishing diets for feedlot cattle
Por:
Franco-Hernández M.A., Corona, Luis, Plascencia, Alejandro, Avery Zinn, Richard
Publicada:
31 dic 2023
Resumen:
Six Holstein steers (153 kg +/- 11) with cannulas in the rumen and
proximal duodenum were used in a 6 x 6 Latin square design experiment to
compare flake density (FD, kg/L), flake thickness (FT, mm),
amyloglucosidase reactivity (AGR, % DM) and faecal starch (FS, % DM)
as predictors of ruminal (RSD, %) and total tract (TSD, %) starch
digestion. Dietary treatments consisted of a finishing diet containing
77% corn. The six corn processing treatments consisted of dry-rolled
corn (DRC) with a density of 0.54 kg/L, and steam-flaked corn (SFC)
processed to obtain densities of 0.46, 0.41, 0.36, 0.31 and 0.26 kg/L.
Compared with DRC, steam flaking enhanced postruminal (34.2%, P < 0.01)
and TSD (7.8%, P < 0.01). Measures of FS were the best single predictor
of both ruminal (r (2 )= 0.97) and TSD (r (2 )= 0.98). Whereas AGR was a
good predictor of RSD (r (2 )= 0.94), it was less effective than FS for
estimation of TSD (r (2 )= 0.91). We conclude that compared with dry
rolling, stream flaking markedly enhances the feeding value of corn. To
evaluate the consistency of the flaking process, we recommend in
addition to the determinations of FD, measurements of FT, starch
enzymatic reactivity and FS are useful indicators.
Filiaciones:
Department of Animal Nutrition and Biochemistry, Veterinary School, University National Autonomous of Mexico, Mexico City, Mexico
Institute for Research in Veterinary Sciences, University Autonomous of Baja California, Mexicali, Mexico
Department of Animal Science, University of California, Davis, CA, United States
Univ Natl Autonomous Mexico, Vet Sch, Dept Anim Nutr & Biochem, Mexico City 4510, DF, Mexico
Univ Autonomous Baja California, Inst Res Vet Sci, Mexicali, Baja California, Mexico
Univ Calif Davis, Dept Anim Sci, Davis, CA 95616 USA
gold, All Open Access; Gold
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