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Microbial Population of Feedlot Waste and Associated Sites

机译：饲养场废物及相关场所的微生物种群

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A quantitative determination was made every 2 months for a year of the microflora of beef cattle waste and runoff at a medium-sized midwestern feedlot. Counts were obtained for selected groups of organisms in waste taken from paved areas of pens cleaned daily and, therefore, reflect the flora of raw waste. Overall, in terms of viable count per gram dry weight, the feedlot waste contained 1010 total organisms, 109 anaerobes, 108 gram-negative bacteria, 107 coliforms, 106 sporeformers, and 105 yeasts, fungi, and streptomycetes. The specific numbers and pattern of these groups of organisms varied only slightly during the study in spite of a wide variation in weather. Data indicate that little microbial growth occurs in the waste as it exists in the feedlot. Runoff from the pens contained the same general population pattern but with greater variation attributable to volume of liquid. Comparable determinations of an associated field disposal area (before and after cropping), stockpiled waste, and elevated dirt areas in the pens indicate that fungi, and especially streptomycetes, are the aerobic organisms most associated with final stabilization of the waste. Yeasts, which are the dominant type of organism in the ensiled corn fed the cattle, do not occur in large numbers in the animal waste. Large ditches receiving runoff and subsurface water from the fields have a population similar to the runoff but with fewer coliforms.
机译：在中型中型饲养场中，每2个月进行一次定量测定，以确定一年中肉牛废物和径流的微生物区系。从每天清洗的笔的铺好的区域中获取的废物中选定的生物类别的计数，因此反映了原始废物的菌群。总体而言，就每克干重的可行计数而言，育肥场废物包含1010种总生物，109种厌氧菌，108克阴性细菌，107种大肠菌，106种孢子形成者和105种酵母，真菌和链霉菌。尽管天气变化很大，但在研究过程中，这些生物体的具体数量和类型仅略有变化。数据表明，粪便中存在的微生物几乎没有微生物生长。围栏的径流包含相同的总体分布模式，但归因于液体量的变化较大。对相关的田间处置区域（种植前后），堆放的废物以及围栏中较高的污垢区域进行比较确定，表明真菌，尤其是链霉菌是与废物的最终稳定度最相关的好氧生物。在牲畜饲养的青贮玉米中，酵母是占主导地位的生物体类型，在动物粪便中并未大量出现。从田间接收径流和地下水的大型沟渠的人口与径流相似，但大肠菌群较少。

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