摘要
Abstract (Summary)During ethanol production, starch is the primary nutrient fermented and the remaining byproducts are excellent sources of fiber and protein. In addition, inclusion of byproducts in finishing diets may reduce the incidence of acidosis. As a result, roughage level and quality could potentially be reduced in finishing diets containing byproducts. Three experiments were conducted to examine the effects of roughage and wet corn gluten feed (WCGF) in finishing cattle diets containing corn distillers grains plus solubles. Cattle fed finishing diets containing wet distillers grains plus solubles (WDGS) with no roughage had decreased DMI and ADG compared to cattle fed roughage. Within roughage level, ADG was similar for cattle fed alfalfa hay, corn silage or corn stalks when included on an equal NDF basis. Apparent total tract digestibility of OM, NDF, and CP linearly decreased and ruminal pH variables increased linearly due to increasing roughage levels. Roughage sources can be exchanged on an equal NDF basis in beef finishing diets containing 30% WDGS (DM basis). In finishing diets containing modified distillers grains plus solubles (MDGS), DMI linearly increased due to increasing roughage levels but ADG responded quadratically and was lowest for cattle fed diets without roughage. There was also a quadratic response for DMI and ADG due to WCGF inclusion level. Gain:feed decreased linearly with increasing roughage and WCGF inclusion levels. Feeding 15% WCGF resulted in similar cattle performance and carcass traits to cattle fed no WCGF in diets containing 30% MDGS, but cattle fed diets with 60% total byproduct inclusion made up of 30% WCGF and 30% MDGS had reduced performance (DM basis). Additionally, reducing corn silage inclusion level to 7.5% resulted in similar finishing cattle performance and carcass traits to cattle fed 15% corn silage in diets containing 30% MDGS with or without inclusion of WCGF. Elimination of roughage in diets containing either WDGS or MDGS resulted in negative impacts on finishing cattle performance, ruminal metabolism, and carcass traits.
摘要译文
抽象（摘要）在乙醇生产，淀粉是主要营养发酵和其余的副产物是优良的纤维和蛋白质来源。另外，夹杂物的副产物在精加工饮食可能降低酸中毒的发生率。其结果是，粗饲料水平和质量可能被降低整理含副产物的饮食。三个实验，研究整理牛日粮含玉米酒糟加可溶粗饲料和湿玉米蛋白饲料（WCGF）的影响。牛喂精含有湿酒糟加可溶物（WDGS），没有粗粮的饮食有所减少DMI和ADG相比，牛喂粗饲料。在粗饲料级，ADG是相似的牛包含在平等的基础上NDF喂食时，苜蓿干草，青贮玉米或玉米秸。OM，NDF和CP的表观总肠道消化率线性下降和瘤胃pH值变量线性增加，由于增加粗饲料的水平。粗饲料来源可以在平等的基础上NDF牛肉精饲料含30％WDGS 25（干物质为基础）进行交换。在整理含有修饰酒糟加可溶物（MDGs）的饮食，DMI由于线性增加粗饲料水平的提高，但ADG回应二次，最低牛饲喂粗饲料无。还有的DMI和ADG由于WCGF水平纳入二次反应。增益：饲料与粗饲料增加和WCGF包含水平直线下降。饲喂15％25 WCGF导致类似牛生产性能和胴体性状的牛在饲喂含30％25 MDGS饮食没有WCGF，但牛饲喂60％25总副产品纳入由30％25 WCGF和30％25 MDGS有性能降低（干物质为基础）。此外，减少玉米青贮添加水平为7.5％，25导致类似的整理牛生产性能和胴体性状牛含30％25 MDGS有或没有列入WCGF的日粮15％25玉米青贮。消除粗饲料含有两种或WDGS日粮MDGS导致对牛整理性能，瘤胃代谢和胴体性状的负面影响。
Benton, Joshua R.. Interaction between roughages and corn milling byproducts in finishing cattle diets[D]. US: The University of Nebraska - Lincoln, 2010