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首页> 外文学位 >Feeding a direct-fed microbial to determine performance, carcass characteristics, and fecal shedding of Escherichia coli O157:H7 in feedlot heifers fed with or without wet distiller's grains plus solubles.
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Feeding a direct-fed microbial to determine performance, carcass characteristics, and fecal shedding of Escherichia coli O157:H7 in feedlot heifers fed with or without wet distiller's grains plus solubles.

机译：饲喂直接饲喂的微生物以确定在饲喂或不饲喂湿酒糟和可溶物的饲育小母牛中大肠杆菌O157：H7的性能，car体特性和粪便脱落。

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摘要

Fluctuating corn prices related to increased ethanol production have had a significant impact on the cost of gain for cattle feeders that rely on corn-based diets. The inclusion of wet distiller's grains plus solubles (WDGS) in feedlot diets has become a common practice in many regions of the U.S. due to the expanded production of by-products. In addition, societal concerns over the continued use of antibiotics in production agriculture combined with an enhanced interest in disease and pathogen prevention in the food supply have led to an increased interest in use of direct-fed microbials (DFM) in growing and finishing cattle. Direct-fed microbials have been shown to improve ADG and feed efficiency, alter ruminal fermentation, and decrease fecal shedding of harmful pathogens in feedlot cattle. The objective of this experiment was to evaluate the effects of Lactobacillus acidophilus combined with Propionibacterium freudenreichii on performance, carcass characteristics, and Escherichia coli O157:H7 shedding in feedlot heifers fed with or without WDGS. Crossbred heifers (n = 288 initial BW = 295 +/- 28 kg) were assigned to 1 of 4 treatments (12 pens per treatment 6 heifers per pen) in a randomized complete block design with a 2 x 2 factorial arrangement of treatments. Across the feeding period, heifers fed 30% WDGS tended (P = 0.09) to have greater ADG and had greater carcass-adjusted ADG (P = 0.05) compared with heifers fed dryrolled corn (DRC). Dry matter intake was not affected (P = 0.65) by diet, although carcass adjusted G:F tended (P = 0.10) to be improved for heifers fed WDGS. Heifers fed 30% WDGS tended (P 0.10) to have greater fat thickness at the 12th rib, lower marbling scores, and higher yield grades. The inclusion of L. acidophilus combined with P. freudenreichii in the diet had no effect (P > 0.10) on performance or carcass merit in the present experiment. The incidence of Escherichia coli O157:H7 throughout the experiment was low, with only 18 positive samples across all sampling periods. Neither WDGS inclusion nor the inclusion of L. acidophilus combined with P. freudenreichii in the diet had any effect (P > 0.10) on E. coli O157:H7 shedding in this experiment. Feeding 30% WDGS to feedlot heifers improved animal performance compared to the DRC based control diet.
机译：与乙醇产量增加相关的玉米价格波动对依靠玉米饮食的牛饲养者的获取成本产生了重大影响。由于副产品的扩大生产，在美国许多地区，在育肥场日粮中加入湿酒糟加可溶物（WDGS）已成为一种普遍做法。此外，社会对在生产农业中继续使用抗生素的关注，以及对食品供应中对疾病和病原体预防的日益关注，导致人们对在牛的生长和肥育中使用直接饲喂微生物（DFM）的兴趣日益增加。研究表明，直接饲喂的微生物可以改善ADG和饲料效率，改变瘤胃发酵，减少粪便牛中有害病原菌的排泄。本实验的目的是评估嗜酸乳杆菌联合弗氏丙酸杆菌对饲喂或不饲喂WDGS的饲育小母牛的性能，car体特性和大肠杆菌O157：H7脱落的影响。杂种小母牛（n = 288，初始体重= 295 +/- 28 kg）被分配到4种处理方法中的一种（每处理12支，每头6头小母牛），采用2 x 2因数排列的随机整块设计。在整个饲喂期中，饲喂30％WDGS的小母牛与饲喂干轧玉米（DRC）的小母牛相比，往往具有更高的ADG和更高的car体调整ADG（P = 0.05）。尽管饲喂WDGS的小母牛的=体校正G：F趋于（P = 0.10）有所改善，但饮食对干物质的摄入没有影响（P = 0.65）。饲喂30％WDGS的小母牛倾向于（P <0.10）在第12肋有更大的脂肪厚度，较低的大理石花纹得分和较高的收成等级。在本实验中，日粮中添加嗜酸乳杆菌与弗氏疟原虫的组合对生产性能或car体品质没有影响（P> 0.10）。整个实验过程中大肠杆菌O157：H7的发生率很低，在所有采样期间只有18个阳性样品。日粮中添加WDGS或将嗜酸乳杆菌与弗氏疟原虫联合使用均未对大肠杆菌O157：H7脱落产生任何影响（P> 0.10）。与基于DRC的对照饮食相比，向肥育小母牛饲喂30％WDGS可以改善动物的生产性能。

著录项

  • 作者

    Wilson, Blake Kenyon.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Agriculture General.Agriculture Animal Culture and Nutrition.
  • 学位 M.S.
  • 年度 2010
  • 页码 69 p.
  • 总页数 69
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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