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Effects of Dakota gold and high fat commodity DDGS in a complete diet on pellet quality
Effects of Dakota Gold and High Fat Commodity DDGS in a Complete Diet on Pellet Quality
A.D. Yoder, J.W. Wilson, C.R. Stark.
Inclusion of dried distillers grains with solubles (DDGS) in pelleted feed is limited because of pellet quality. Including a reduced-fat DDGS instead of a higher fat DDGS may mitigate these negative effects. Thus, the objective of this experiment was to evaluate pellet quality when 2 different sources of DDGS were used in a pelleted complete feed. The experiment was set up as a 2 × 2 × 2 × 4 factorial arrangement with two sources of DDGS (reduced and high-fat DDGS), two pellet temperatures (65.6oC and 82.2oC), two inclusion rates (15% and 30%) and four Pellet Durability Methods (Standard Pellet Durability Index (PDI) (ASABE S269.4, 2007), Modified PDI (three 19 mm hex nuts), Holmen NHP 100 for 60 sec, and Holmen NHP 200 for 240 sec) in a typical complete feed formulated for a finishing swine diet. Reduced-fat DDGS (Dakota Gold) was sourced from POET, LLC and high-fat DDGS was sourced from a local feed mill. Feed was pelleted on a 1 ton per hour pellet mill (CPM Model PM 1012-2) equipped with a 4.0 mm x 32 mm die. Throughput was held constant at 680 kg/hour. Each treatment was replicated three times. Data were analyzed using the GLIMMIX procedure of SAS. There was no interaction between any two variables of the experiment. The addition of Dakota Gold improved pellet quality by 5.2 percentage points (P < 0.05). The PDI results were 88.0% and 82.8% for the Dakota Gold and 8% fat commodity DDGS, respectively. Inclusion level (P = 0 .71) or conditioning temperature (P = 0.103) had no effect on PDI. The PDI method of analysis had the greatest effect on the results (P < 0.05). The result of Standard PDI, Modified PDI, Holmen NHP 100, and Holmen NHP 200 were 95%, 91%, 89%, and 67%, respectively. The NHP 200 method produced the lowest values primarily due to the long run time of the method. The feed industry should select the method that best models their feed manufacturing and delivery processes. The results of this experiment indicate that the addition of lower fat DDGS improves pellet quality, and the PDI method of analysis can significantly impact the results reported in the industry.
Keywords:
Pellet, DDGS, Pellet Durability Index.