• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Agricultural Systems >Greenhouse-gas emissions of beef finishing systems in the Southern High PLAINS
【24h】

Greenhouse-gas emissions of beef finishing systems in the Southern High PLAINS

机译：南部高平原牛肉整理系统的温室气体排放

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Greenhouse gases (GHG) have been implicated in global warming and climate change. While life cycle assessments (LCA) and GHG studies have been conducted for numerous agricultural commodities, there has been little effort to estimate GHG (CO2, N2O, and CH4) from beef finishing systems of the Southern High Plains (SHP) region, which produces approximately 30% of the United States beef. The objective of this research was to quantify the carbon footprint of five beef-finishing systems using a dynamic, systems-based model that calculated CO(2)e emissions attributable to both animal gain and manure management. The systems consisted of native grass pasture (NGP, System 1); native grass pasture with feedyard finishing (NGP-FY, System 2); wheat pasture with feedyard finishing (WP-FY, System 3); feedyard-only (FY, System 4); and native grass pasture, wheat pasture, and feedyard finishing (NGP-WP-FY, System 5). Although rarely used, the NGP was included as a baseline. Variables in the model and associated management decisions were based on feed type, nutritional content, feed source, and hauling distance. The starting point of the model was a weaned steer (250 kg) and the endpoint was a steer which would grade "choice" (28% body fat) or 30 months in age, whichever came first. Overall CO(2)e kg(-1) gain decreased when cattle were fed high-quality diets and were intensively managed for production in the shortest time possible. The FY produced the desired carcass in the shortest time with the lowest cumulative emissions. The FY also had the highest average daily gain, lowest dry matter and water intake, as well as manure production. Net GHG emissions from FY were 4.84 kg CO(2)e kg(-1) gain (1799 kg CO(2)e animal(-1)). Net GHG emissions from NGP-FY, WP-FY, NGP-WP-FY, and NGP were 1.62, 1.81, 2.08, and 3.69 times that of FY, respectively. These results suggest that intensive feeding and management of beef cattle in the FY system result in the lowest overall CO(2)e emissions to produce a mature steer. Consequently, feeding systems that include native grass and wheat pasture have proportionately larger amounts of CO(2)e emissions.
机译：温室气体（GHG）涉及全球变暖和气候变化。虽然为众多农产品进行了生命周期评估（LCA）和GHG研究，但几乎没有努力估计来自南高平原（SHP）地区的牛肉精加工系统的GHG（CO2，N2O和CH4），其产生大约30％的美国牛肉。本研究的目的是使用基于动态的系统的模型来量化五种牛肉精加工系统的碳足迹，该模型计算占动物增益和粪便管理的CO（2）E排放。该系统由本土草牧场（NGP，系统1）组成;与饲养物园的原生草地牧场（NGP-FY，System 2）;小麦牧场与饲养物品装饰（WP-FY，System 3）;仅供进食（FY，System 4）;和原生草牧场，小麦牧场和饲养场所精加工（NGP-WP-FY，系统5）。虽然很少使用，但NGP被包含为基线。模型和相关管理决策中的变量基于饲料类型，营养内容，馈送源和牵引距离。该模型的起点是断奶转向（250公斤），端点是一种转向，它将级别“选择”（28％的体脂）或30个月，以先到先得的方式。当牛喂养高质量的饮食时，总共CO（2）e KG（-1）收益减少，并在最短的时间内集中地进行生产。 FY在最短的时间内生产了所需的屠体，累积排放量最低。 FY还具有最高的每日增益，最低干物质和水摄入量，以及粪便生产。来自FY的净温室气体排放为4.84千克CO（2）千克（-1）增益（1799千克CO（2）E动物（-1））。 NGP-FY，WP-FY，NGP-WP-FY和NGP的净温室气体排放分别为1.62,1.81,2.08和FY的3.69倍。这些结果表明，FY系统中的牛肉牛的密集喂养和管理导致总体CO（2）e排放量最低，以产生成熟的转向。因此，包括本地草和小麦牧场的饲养系统具有比例的较大量的CO（2）E排放。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号