Flaking corn processing.pdf

Overview

This article systematically examines the effects of steam-flaked corn on feedlot cattle performance, elucidating the mechanisms behind its enhanced energy value, critical production parameters, and quality assessment standards. The study reveals that steam flaking disrupts the protein matrix encapsulating corn starch, significantly improving the digestibility of both starch and non-starch organic matter. The actual net energy (NE) value of steam-flaked corn exceeds tabular values (e.g., NRC) by 15–18%. Key recommendations include optimizing production processes (e.g., flake density control) and adopting fecal starch analysis for quality evaluation, providing a scientific basis for feedlot cattle nutrition.

Title

Steam Flaking of Corn: Processing Mechanics, Quality Standards, and Impacts on Energy Availability and Performance of Feedlot Cattle

Authors

R. A. Zinn, F. N. Owens, R. A. Ware

Affiliation: University of California, Desert Research and Extension Center, El Centro 92243

Key Findings

1. Core Discoveries

• Energy Value Enhancement: Steam flaking increases the net energy (NE) of corn by an average of 18%, far surpassing traditional tabular estimates (e.g., 4–11% in NRC standards).
• Digestibility Mechanisms:
  • Starch digestibility improves by 10% (99% vs. 90% for dry-rolled corn).
  • Non-starch organic matter (e.g., protein) digestibility rises by 10% (80.6% vs. 73%).
• Methane Reduction: Steam flaking reduces methane energy losses during ruminal fermentation by up to 30%.

2. Critical Production Parameters

• Five Key Factors:
  1. Steam chest temperature (must remain high to optimize shear forces).
  2. Steaming time (≥30 minutes at maximum mill capacity).
  3. Roll corrugation (affects flake uniformity).
  4. Roll gap (1.0 mm initial gap recommended to minimize unprocessed kernels).
  5. Roll tension (high pressure ensures consistent flake density).