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Thesis - University Access Only
Master of Science (MS)
Distillers grains, Dairy cows
The purpose of this study was to determine the lactation performance of dairy cows fed dried or wet distillers grains (DG) with solubles (DDGS or WDGS) at two dietary concentrations. Using 15 cows, a lactation trial was designed as a replicated 5 x 5 Latin square. Periods were 4 wk each, with samples and data collection during wk 3 and 4. Diets, on a DM basis, were: control (C), 10% DDGS, 20% DDGS, 10% WDGS, and 20% WDGS. All diets contained 25% com silage, 25% hay, and 50% of the respective concentrate mixes. Diets were balanced, using com and soybean meal, for 1 7% crude protein. Dry matter intake (DMI) tended (P < 0.1) to be greater for cows fed C than DG (23.4, 22.8, 22.5, 23.0, 21.9 kg/d for C, 10% DDGS, 20% DDGS, 10% WDGS, 20% WDGS). Milk yield (39.8, 40.9, 42.5, 42.5, 43.5 kg/d) was greater (P < 0.05) for cows fed DG than C. Milk fat percentage (3.23, 3.16, 3.28, 3.55, 3.40) was similar for cows fed C and DG, but greater (P < 0.05) for cows fed WDGS than DDGS. Milk fat yield (1.28, 1.32, 1.39, 1.44, 1.43 kg/d) was greater (P < 0.05) for cows fed DG than C, and tended (P < 0.1) to be greater for cows fed WDGS than DOGS. Milk protein percentage (3.05, 3.01, 3.02, 3.11, and 3.06) was similar for cows fed C and DG, but greater (P3) concentrations (4.81, 3.75, 3.10, 3.91, 5.04 mg/dL) were greater (P < 0.05) for cows fed WDGS than DDGS. Overall, feeding DG improved performance by decreasing DMI, and increasing yields of milk, protein, and fat. This led to greater (P < 0.05) feed efficiency, as determined by energy-corrected milk (ECM) divided by DMI, in the DG fed cows compare to C fed cows (1.70, 1.79, 1.87, 1.84, 1.92). Responses were similar for 10% or 20% DG; however, feeding WDGS instead of DDGS increased milk fat and protein percentages. A supplemental in situ study showed that SBM had a greater (P
Library of Congress Subject Headings
Dairy cattle -- Feeding and feeds
Includes bibliographical references (pages 52-58)
Number of Pages
South Dakota State University
Ladd, Jill Marie, "Evaluation of Dried and Wet Distillers Grains Included at Two Concentrations in the Diets of Lactating Dairy Cows" (2005). Theses and Dissertations. 1485.