The objective of the study was to investigate the effects of dietary forage and distillers dried grains with solubles (DDGS) concentration on the performance of lactating dairy cows. Twelve Holstein cows were blocked by parity and milk production and assigned to replicated 4 × 4 Latin squares with a 2 × 2 factorial arrangement of treatments. Diets were formulated to contain low forage [LF; 17% forage neutral detergent fiber (NDF)] or high forage (HF; 24.5% forage NDF) and DDGS at 0 or 18% of diet dry matter. The forage portion of the diet consisted of 80% corn silage and 20% alfalfa hay (dry matter basis). A portion of the ground corn and all of the expeller soybean meal and extruded soybeans from 0% DDGS diets were replaced with DDGS to formulate 18% DDGS diets. Overall, we found no interactions of forage × DDGS concentrations for any of the production measures. We observed no effect of diet on dry matter intake. Milk yield was greater when cows were fed LF diets compared with HF diets (43.3 vs. 41.5 kg/d). Milk fat concentration (3.03 vs. 3.38%) was lower for cows fed LF diets compared with HF diets, whereas protein concentration (3.11 vs. 2.98%) and yield (1.34 vs. 1.24 kg/d) were greater for cows fed LF diets compared with HF diets. Yields of fat, total solids, energy-corrected milk, and feed efficiency were not affected by diets. Cows partitioned equally for milk, maintenance, and body reserves. Replacing starch from ground corn and protein from soybean feeds with DDGS at either 17 or 24.5% of forage NDF concentration in the diet was cost-effective and did not affect the production performance of lactating dairy cows.

这项研究的目的是研究日粮饲草和酒糟含可溶物（DDGS）浓度对泌乳奶牛生产性能的影响。十二头荷斯坦奶牛被均等和产奶量所阻拦，并分配给重复的4×4拉丁方，采用2×2析因布置。日粮配制为低草料[LF; 日粮干物质为0或18％时，17％的草料中性洗涤剂纤维（NDF）或高草料（HF; 24.5％的草料NDF）和DDGS。日粮中的草料部分包括80％的玉米青贮饲料和20％的苜蓿干草（以干物质计）。用DDGS代替0％DDGS日粮中的一部分玉米粉和所有压榨机豆粕和膨化大豆，以配制18％DDGS日粮。全面的，我们发现在任何生产措施中草料×DDGS浓度均无相互作用。我们观察到饮食对干物质摄入量没有影响。饲喂LF日粮的母牛比HF日粮的牛奶产量更高（43.3 vs. 41.5 kg / d）。饲喂LF饮食的母牛的乳脂浓度（3.03 vs. 3.38％）低于HF饲粮，而饲喂LF饮食的母牛的蛋白质浓度（3.11 vs. 2.98％）和产量（1.34 vs. 1.24 kg / d）较高。与HF饮食相比。饮食不影响脂肪，总固体，能量校正的牛奶和饲料效率的产量。母牛平均分配牛奶，维持身体和储备身体。用17或24的DDGS代替玉米粉中的淀粉和大豆饲料中的蛋白质。