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首页> 外文期刊>Environmental Science & Technology >Ractopamine and Other Growth-Promoting Compounds in Beef Cattle Operations: Fate and Transport in Feedlot Pens and Adjacent Environments
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Ractopamine and Other Growth-Promoting Compounds in Beef Cattle Operations: Fate and Transport in Feedlot Pens and Adjacent Environments

机译：牛肉牛手术中的牛酸胺和其他生长促进化合物：FEET和运输在饲料栏和邻近环境中

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The current study represents a comprehensive investigation of the occurrence and fates of trenbolone acetate (TBA) and metabolites 17α-trenbolone (17α-TBOH), 17β-TBOH, and trendione (TBO); melengesterol acetate (MGA); and the less commonly studied β- andrenergic agonist ractopamine (RAC) in two 8 month cattle feeding trials and simulated rainfall runoff experiments. Cattle were administered TBA, MGA, or RAC, and their residues were measured in fresh feces, pen floor material, and simulated rainfall runoff from pen floor surfaces and manure-amended pasture. Concentrations of RAC ranged from 3600 ng g~(-1), dry weight (dw), in pen floor to 58 000 ng g~(-1) in fresh feces and were, on average, observed at 3-4 orders of magnitude greater than those of TBA and MGA. RAC persisted in pen floors (manure t_(1/2) = 18-49 days), and contamination of adjacent sites was observed, likely via transport of windblown particulates. Concentrations in runoff water from pen floors extrapolated to larger-scale commercial feedlots revealed that a single rainfall event could result in mobilization of gram quantities of RAC. This is the first report of RAC occurrence and fate in cattle feedlot environments, and will help understand the risks posed by this chemical and inform appropriate manure-management practices.
机译：目前的研究中表示的发生和醋酸群勃龙（TBA）和代谢物17α-群勃龙（17α-TBOH），17β-TBOH，和trendione（TBO）的命运的全面调查; melengesterol乙酸（MGA）;和较通常研究β-肾上腺素能激动剂莱克多巴胺（RAC）在2种8个月牛饲养试验和模拟降雨径流实验。牛施用TBA，MGA，或RAC，并在新鲜粪便，笔地板材料测量它们的残基，并且从模拟笔地板表面和粪肥-修正牧场降雨径流。 RAC的浓度从3600纳克克〜（-1），干重（DW）不等，在笔地板58 000纳克克〜（-1）在新鲜粪便和是，平均来说，在3-4个数量级观察大于那些TBA和MGA的。 RAC坚持笔地板（粪T_（1/2）= 18-49天），并且观察到相邻的位点的污染，通过风吹颗粒的运输可能。从外推到较大规模的商业化饲养场笔径流楼水浓度表明，单一的降雨可能会导致动员RAC的克数量。这是RAC发生和命运牛饲养场环境的第一份报告，并且将有助于了解风险的这种化学物质构成，并告知相应的粪便管理做法。

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  • 来源
    《Environmental Science & Technology》 |2021年第3期|1730-1739|共10页
  • 作者

    J. K. Challis; S. Sura; J. Cantin; A. W. Curtis; K. M. Shade; T. A. McAllister; P. D. Jones; J. P. Giesy; F. J. Larney;

  • 作者单位

    Toxicology Centre University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada;

    Agriculture and Agri-Food Canada (AAFC) Morden Manitoba R6M 1Y5 Canada;

    Toxicology Centre University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada Agriculture and Agri-Food Canada (AAFC) Lethbridge Alberta T1J 4B1 Canada;

    Agriculture and Agri-Food Canada (AAFC) Lethbridge Alberta T1J 4B1 Canada;

    Agriculture and Agri-Food Canada (AAFC) Lethbridge Alberta T1J 4B1 Canada;

    Agriculture and Agri-Food Canada (AAFC) Lethbridge Alberta T1J 4B1 Canada;

    Toxicology Centre University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada;

    Toxicology Centre University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada Department of Veterinary Biomedical Sciences University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada Department of Environmental Science Baylor University Waco Texas 76798 United States;

    Agriculture and Agri-Food Canada (AAFC) Lethbridge Alberta T1J 4B1 Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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