The objective of the experiment was to examine effects of a diet containing a high concentration (28.8% dry matter basis) of corn distillers grain with solubles on manure characteristics and NH3 and H2S emissions from dairy cow manure. Eighteen cows were blocked by parity and days in milk, and cows in each block were assigned to the following treatments: the control diet (CON) or CON with distillers grains with solubles at 28.8% (dry matter basis) replacing mainly soybean meal (DG). The experiment was conducted for 11 wk, and feces and urine from individual cows were collected over 3 d in wk 11 (a total of 8 spot samples per cow). Fecal or urine samples were composited by cow, and the composite feces and urine were analyzed for indigestible neutral detergent fiber and creatinine concentration, respectively, for individual cows to estimate total fecal and urine outputs. Immediately before the manure incubation, composited feces and urine were sampled to determine manure characteristics. Manure was reconstituted according to daily fecal and urine excretion estimated for individual cows. Individual manures were incubated using a continuous air flux multichamber system over 10 d to measure NH3 and H2S emissions. All data from 18 manures were analyzed using the Mixed procedure of SAS (SAS Institute Inc., Cary, NC). The ratio of feces to urine and the contents of manure total and volatile solids were not different among treatments. Urine from DG had lower pH and DG manure had lower N content and greater S content compared with CON. During the 10-d incubation, NH3 emission was considerably less for DG versus CON. The emission of H2S over 10 d for DG was greater compared with that for CON. After the incubation, manure pH and N and S concentrations were greater for DG versus CON. In conclusion, manure from cows fed a high-DG diet decreased urinary N contribution to manure N and lowered urine pH, which were the factors that caused the decrease in NH3 emission from DG manure. However, the DG diet increased dietary S concentration and increased S excretion in urine and feces. This increased H2S emission from DG manure during the 10-d manure incubation.

中文翻译：

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向奶牛饲喂含有可溶物的玉米酒糟的日粮会改变粪便特性以及粪便中氨和硫化氢的排放。


该实验的目的是检验含有高浓度（28.8% 干物质基础）玉米酒糟和可溶物的日粮对粪便特性以及奶牛粪便中 NH3 和 H2S 排放的影响。根据胎次和产奶天数对 18 头奶牛进行分组，每个分组中的奶牛被分配接受以下处理：对照日粮 (CON) 或使用可溶物含量为 28.8%（干物质基础）的酒糟的 CON（主要替代豆粕（DG）） ）。实验进行了11周，在第11周的3天内收集了每头奶牛的粪便和尿液（每头奶牛总共8个点样）。采集奶牛的粪便或尿液样本，并分别分析每头奶牛的粪便和尿液的不可消化中性洗涤纤维和肌酸酐浓度，以估计粪便和尿液的总排出量。在粪便孵化之前，对复合粪便和尿液进行取样以确定粪便特性。根据每头奶牛每日粪便和尿液排泄量的估计，重新配制粪便。使用连续空气通量多室系统对单个粪便进行 10 天以上的培养，以测量 NH3 和 H2S 排放量。 18 种粪便的所有数据均使用 SAS 混合程序（SAS Institute Inc.，卡里，北卡罗来纳州）进行分析。处理间粪尿比、粪便总固体含量和挥发性固形物含量无差异。与 CON 相比，DG 尿液的 pH 值较低，DG 粪便的氮含量较低，硫含量较高。在 10 天的培养过程中，DG 的 NH3 排放量比 CON 少得多。 DG 10 d 的 H2S 排放量高于 CON。孵化后，DG 的粪便 pH 值以及 N 和 S 浓度高于 CON。 总之，饲喂高 DG 日粮的奶牛粪便降低了尿氮对粪便氮的贡献并降低了尿液 pH 值，这是导致 DG 粪便中 NH3 排放量减少的因素。然而，DG 饮食增加了膳食中硫的浓度，并增加了尿液和粪便中硫的排泄。这增加了 10 天粪肥孵化过程中 DG 粪肥的 H2S 排放量。