Is the Grass Always Greener?
Comparing the Environmental Impact of Conventional, Natural and Grass-Fed Beef Production Systems
Judith L. Capper Department of Animal Sciences, Washington State University, Pullman, WA 99164, USA; E-Mail: email@example.com;
Tel.: +1-607-379-9229; Fax: +1-509-335-1082 Received: 22 January 2012; in revised form: 27 March 2012 / Accepted: 31 March 2012 / Published: 10 April 2012
The environmental impact of three beef production systems was assessed using a deterministic model. Conventional beef production (finished in feedlots with growth-enhancing technology) required the fewest animals, and least land, water and fossil fuels to produce a set quantity of beef. The carbon footprint of conventional beef production was lower than that of either natural (feedlot finished with no growth-enhancing technology) or grass-fed (forage-fed, no growth-enhancing technology) systems.
All beef production systems are potentially sustainable; yet the environmental impacts of differing systems should be communicated to consumers to allow a scientific basis for dietary choices.
Abstract: This study compared the environmental impact of conventional, natural and grass-fed beef production systems. A deterministic model based on the metabolism and nutrient requirements of the beef population was used to quantify resource inputs and waste outputs of hot carcass weight beef in conventional (CON), natural (NAT) and grass-fed (GFD) production systems. Production systems were modeled using characteristic management practices, population dynamics and production data from U.S. beef production systems. Increased productivity (slaughter weight and growth rate) in the CON system reduced the cattle population size required to produce beef compared to the NAT or GFD system… The carbon footprint of beef production was lowest in the CON system, intermediate in the NAT system and highest in the GFD system. The challenge to the U.S beef industry is to communicate differences in system environmental impacts to facilitate informed dietary choice…
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