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ABSTRACT
Three experiments were conducted to evaluate nutrient content and DM determination
methods of dry milling byproducts. In Exp. 1, nutrient composition was determined
for wet distillers grains plus solubles (WDGS) and modified distillers grains plus
solubles (MDGS) from 6 ethanol plants with 10 samples collected per day, across 5
d, and sampling was repeated over 4 separate months. Mean composition was 31.0% CP,
11.9% fat, 0.84% P, and 0.77% S (DM basis). Coefficients of variation for DM content
were greater for some plants than others, and variation occurred within and across
days. Variability was small for CP and P, whereas fat differed among ethanol plants.
Large variation in means and CV were observed for S in period 1, but variation subsequently
decreased. Coefficients of variation for S were similar for samples collected within
the same day and across days. In Exp. 2, samples of WDGS, MDGS, Dakota Bran Cake,
and distillers solubles were used to determine DM content by drying samples at 105°C
for 3, 8, and 24 h and 60°C for 24 and 48 h, vacuum oven drying, toluene distillation,
and Karl Fischer titration. Compared with toluene distillation, drying at 105°C resulted
in less DM (P ≤ 0.10) and vacuum drying and Karl Fischer titration resulted in greater
DM (P < 0.01). In Exp. 3, additional WDGS, MDGS, and wet grains with no solubles were
used to determine DM with oven drying at 60°C for 48 h, oven drying at 105°C for 3
h, or toluene distillation. Drying at 60°C for 48 h was similar to toluene distillation
(P ≥ 0.60).
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© 2011 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
