This study investigated the effects of continuous feeding of high inclusion of reduced-fat corn distillers grains with solubles with and without monensin on dry matter intake (DMI), production, milk fatty acid profile, and plasma AA profile in lactating cows. The experiment was conducted for 12 wk (1-wk covariate, 2-wk diet adaptation, and 9-wk experimental period of data collection) with 36 Holstein cows in a randomized complete block design. Cows were blocked by parity, days in milk, and milk yield and assigned to the following diets: (1) control (CON), (2) CON with reduced-fat corn distillers grains with solubles included at 28.8% (dry matter basis) replacing soybean meal, soyhulls, and supplemental fat (DG), and (3) DG with monensin (Rumensin; Elanco Animal Health, Greenfield, IN) supplemented at a rate of 20 mg/kg of DM offered (DGMon). Orthogonal contrasts were used to compare CON versus DG and DGMon and to compare DG versus DGMon. Milk yield was not affected (40.3 vs. 40.8 kg/d) by DG and DGMon compared with CON. However, for DG and DGMon compared with CON, decreased DMI (24.9 vs. 26.4 kg/d), milk fat yield (1.12 vs. 1.55 kg/d), milk protein yield (1.24 vs. 1.32 kg/d), and energy-corrected milk yield (37.7 vs. 43.5 kg/d) were observed. Feeding DGMon compared with DG did not affect DMI (24.4 vs. 25.4 kg/d) and milk yield (39.2 vs. 41.3 kg/d) but decreased milk fat yield (1.08 vs. 1.23 kg/d), milk protein yield (1.20 vs. 1.28 kg/d), and energy-corrected milk yield (36.0 vs. 39.4 kg/d). Interactions between treatment and week for DMI, milk fat yield, and energy-corrected milk indicate that production responses to DG and DGMon versus CON were decreased over the experimental period. Cows fed DG and DGMon had increased milk fat concentration of trans-10,cis-12 18:2, trans-10 18:1, and long-chain (>16C) and polyunsaturated fatty acids and decreased short-chain (<16C) and odd- and branched-chain fatty acids compared with CON. No difference was observed between DG and DGMon in milk fatty acid profile. In the current study, feeding a high-DG diet did not sustain DMI and production, and supplementing monensin to a high-DG diet further decreased DMI and production.

这项研究调查了连续饲喂含和不含莫能菌素的可溶物的高含量减脂玉米蒸馏器谷物连续饲喂对泌乳母牛干物质摄入量（DMI），产量，牛奶脂肪酸谱和血浆AA谱的影响。该实验是对36头荷斯坦奶牛进行的12周（1周协变量，2周饮食适应和9周实验数据收集实验）进行的，采用了随机完整区组设计。母牛被胎次，产奶天数和产奶量所限制，并被分配以下饮食：（1）对照（CON），（2）CON含减脂玉米酒的谷物中可溶物含量为28.8％（以干物质计） （3）DG用莫能菌素（Rumensin；伊兰科动物健康公司，格林菲尔德，印第安纳州）补充，以20毫克/千克DM的比例（DGMon）补充。使用正交对比来比较CON与DG和DGMon以及比较DG与DGMon。与CON相比，DG和DGMon不影响牛奶产量（40.3 vs. 40.8 kg / d）。但是，与CON相比，DG和DGMon的DMI降低（24.9 vs. 26.4 kg / d），乳脂产量（1.12 vs. 1.55 kg / d），乳蛋白产量（1.24 vs.1.32 kg / d）和能量降低观察到校正后的牛奶产量（37.7 vs. 43.5 kg / d）。与DG相比，饲喂DGMon不会影响DMI（24.4 vs. 25.4 kg / d）和产奶量（39.2 vs. 41.3 kg / d），但降低了乳脂产量（1.08 vs. 1.23 kg / d），乳蛋白产量（1.20）比1.28公斤/天）和能量校正的牛奶产量（36.0比39.4公斤/天）。DMI，乳脂产量和能量校正乳的处理和每周之间的相互作用表明，在实验期间，对DG和DGMon对比CON的生产反应有所降低。反式-10，顺式-12 18：2，反式-10 18：1和长链（> 16C）和多不饱和脂肪酸以及减少的短链（<16C）和奇数和支链脂肪酸CON。DG和DGMon之间的牛奶脂肪酸谱没有差异。在当前的研究中，饲喂高DG饮食不能维持DMI和生产，向高DG饮食补充莫能菌素会进一步降低DMI和生产。