PSVIII-12 An economic and emergy approach to evaluate the level of sustainability of lamb production: A case study in Brazil

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Abstract This study employed the Economic Theory (ET) to calculate the production costs and the Emergy Methodology (EM) to identify the contributions of nature and economy of lambs produced in an intensive system located in Cravinhos city, State of São Paulo. In addition, was employed Emergy Methodology (EM) to identify the contributions of nature and economy in the system. The adopted scheme of cost allocation followed the classification according to ET, under Variable Cost (VC), Operational Fixed Cost (FC), Opportunity Costs of land and capital (OC), and Total Cost (TC). The EM manages to quantify all the resources used in the system in Contributions from Nature (I) and Feedback from the economy (F). The I originate from the Sum of Renewable (R) and Non-renewable (N) local resources, while that F is composed of the Materials (M) and Services (S) from the economic system. We found that to produce 935 lambs per year the TC was US$ 96,021.08. VC represented 19.08% of TC, while 76.6% were represented by FC, and 4.3% by the IF. The cost produced per animal and kg of live weight was US$ 72.73 and US$ 1.82, respectively. On the other hand, the total energy flow (Y) required by the system was 3.05E+16 seJ/yr (Solar Joules per year) for produce (Ep) 1.68E+06J/yr (Joules per year). Y was represented in a 53.92% by I (7.98% for R, from the sun, rain, and wind; and 45.94% for N, from the soil loss and groundwater), and 46,08% by F (27.8% for M, from the feed, minerals, steel, fueled, etc. and 10.7% for S, from manpower, other services external, taxes, etc.). These results show that the studied system has a %Renewability (%R = R / Y) of 7.98%. Thus, we can conclude that the system depends on 92.02% of resources from non-renewable sources.