Davis M E, Parrott T, Brown D C, de Rodas B Z, Johnson Z B, Maxwell C V, Rehberger T
Agtech Products Inc., W227N552 Westmound Drive, Waukesha, WI 53186, USA.
J Anim Sci. 2008 Jun;86(6):1459-67. doi: 10.2527/jas.2007-0603. Epub 2008 Jan 11.
A direct-fed microbial (DFM) based on a combination of Bacillus organisms specifically selected to increase the manure decomposition process was evaluated to determine its efficacy for improving growth performance and manure dissolution time. Three experiments involving 336 crossbred barrows and gilts were conducted to determine the effect of the Bacillus-based direct-fed microbial on growth performance and pen cleaning time. In each experiment, 2 dietary treatments (0 and 0.05% DFM) were fed during the growing-finishing period throughout the experiment, such that the DFM provided 1.47 x 10(8) cfu of Bacillus organisms per gram of supplement. Data from the 3 experiments were combined for analysis, such that there were 28 pens representing each of the 2 treatments. Pigs were weighed and feed intake was determined at the initiation and termination of each phase (starter, grower, and finisher). At the end of Exp. 1 and 3, pen cleaning time was determined by measuring the time required for each pen to be scraped and washed with a high-pressure sprayer. Additionally, 2 solid manure mat samples weighing approximately 4 g each were collected from solid manure buildup in each pen (16 pens/treatment), and the time required to completely disperse each manure mat sample was determined. Gain:feed improved (P < 0.05) in pigs fed Bacillus compared with the control diet during the finisher phase and throughout the combined growing-finishing period. The time required to dissolve the manure mat was reduced (P < 0.01) in samples collected from pens containing pigs fed Bacillus compared with samples from control pens. An additional evaluation was conducted in a commercial swine production facility using statistical process control analysis. Statistical process control analysis determined that supplementation with Bacillus increased the expected mean for ADG and decreased the expected mean for death loss percentage. Supplementation with a DFM composed of specifically selected Bacillus organisms improved G:F and decreased the time required to disperse a swine manure mat sample in a controlled study conducted at swine research facilities. Furthermore, when evaluated in a commercial swine production facility, the Bacillus-based DFM improved ADG and reduced mortality of pigs during the growing-finishing period.
对一种基于特定选择的芽孢杆菌组合的直接投喂微生物（DFM）进行了评估，这些芽孢杆菌旨在增强粪便分解过程，以确定其对改善生长性能和粪便溶解时间的功效。进行了三项涉及336头杂交公猪和母猪的实验，以确定基于芽孢杆菌的直接投喂微生物对生长性能和猪栏清洁时间的影响。在每个实验中，在整个生长育肥期投喂两种日粮处理（0和0.05% DFM），使得DFM每克补充剂提供1.47×10⁸ cfu的芽孢杆菌。将来自这三项实验的数据合并进行分析，这样每种处理有28个猪栏。在每个阶段（仔猪、生长猪和育肥猪）开始和结束时对猪进行称重并测定采食量。在实验1和3结束时，通过测量用高压喷雾器刮擦和冲洗每个猪栏所需的时间来确定猪栏清洁时间。此外，从每个猪栏（每个处理16个猪栏）的固体粪便堆积物中收集两个重量约为4克的固体粪便垫样本，并确定完全分散每个粪便垫样本所需的时间。与对照日粮相比，在育肥阶段和整个生长育肥期，饲喂芽孢杆菌的猪的增重：采食量有所改善（P < 0.05）。与对照猪栏的样本相比，从饲喂芽孢杆菌的猪的猪栏中收集的样本中粪便垫溶解所需的时间减少了（P < 0.01）。在一个商业养猪场使用统计过程控制分析进行了额外评估。统计过程控制分析确定，补充芽孢杆菌提高了平均日增重的预期均值，并降低了死亡损失百分比的预期均值。在养猪研究设施进行的一项对照研究中，补充由特定选择的芽孢杆菌组成的DFM提高了增重：采食量，并减少了分散猪粪便垫样本所需的时间。此外，在一个商业养猪场进行评估时，基于芽孢杆菌的DFM在生长育肥期提高了猪的平均日增重并降低了死亡率。
