Resumo

FERNANDEZ ROSSO, C et al. Modelación productiva, económica y emisión de metano en sistemas de cría vacuna de Bahía Blanca y Coronel Rosales. RIA. Rev. investig. agropecu. [online]. 2018, vol.44, n.2, pp.129-135. ISSN 1669-2314.

The aim of this study was to evaluate the productive, economic, methane emissions performance and the marginal value of additional feed (MVF) for the different cow-calf systems from Bahía Blanca and Coronel Rosales. A dynamic “whole-farm” model (SIMUGAN) and regional data was used to evaluate four cow-calf system scenarios based on changes in pasture area and management policies as the weaning date: Traditional (Trad), Transitional 1 (Trans1), Transitional 2 (Trans2) and High Technology (HTech). The increase in productivity was positively associated with gross margin [GM($/ha)=-1488.6+30.2 x beef production, R2 0.99] and negatively associated with methane emission intensity [IMC(kgCH₄CO₂-e/kg live weight produced)= 20.4-0.1 x production, R2 0.98]. The MVF ($/KgMS/ha) is a systemic indicator for strategic supplementation opportunities, and Trad and Trans1 achieved higher values than Trans2 and Tecn. Overall, the scenarios showed higher VMA when during winter and spring seasons, followed by the annual feeding. This global assessment showed positive opportunities for improving system productivity based on perennial pastures.

Palavras-chave : Beef cattle; Pasture; Technology.

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