Evaluation of Feed Strategies and Changes of Stocking Rate to Decrease the Carbon Footprint in a Traditional Cow-Calf System: A Simulation Model

Abstract

One of the main production challenges associated with climate change is the reduction of carbon emissions. Increasing the efficiency of resource utilization is one way to achieve this purpose. The modification of production systems through improved reproductive, genetic, feed, and grazing management practices has been proposed to increase technical–economic efficiency, even though the “environmental viability” of these modifications has not always been evaluated. The objective of this study was to evaluate the use of feeding and management strategies on the carbon footprint (CF) and economic variables in the traditional cow–calf system in southern Chile using a simulation model. The modifications evaluated corresponded to combinations of stocking rate, use of creep feeding practices with different supplementation levels, and the incorporation of feed additives to the supplement, using factorial experiments. Additionally, the scenarios were evaluated with and without carbon sequestration. The CF for the baseline scenarios was 12.5 ± 0.3 kg of CO2−eq/kg of live weight (LW) when carbon sequestration was considered and 13.0 ± 0.4 kg of CO2−eq/kg of LW in the opposite case. Changes in stocking rate, supplementation level, and consideration of carbon sequestration in pasture and soil had a significant effect on the CF in all simulated scenarios. The inclusion of additives in the supplement did not have a significant effect on production costs. With regard to reducing greenhouse gas (GHG) emissions, incorporating canola oil presented the best average results. The model developed made the selection of environmentally viable feed strategies or management adaptations possible.

Carbon cycle of native pasture-based beef cattle production systems in the Pantanal area of the Paraguayan Chaco

“…The greatest challenges faced by the livestock industry is to meet the growing demand of environmentally safe food by consumers, and minimize the environmental and social impacts generated by this activity (AsemHiablie et al, 2018). The livestock industry is considered one of the main agricultural activities responsible for anthropogenic emissions of greenhouse gases (GHG), with an apparent annual emission of 7 gigatons (ToroMujica, 2021), representing between 14.5 and 18 % of agricultural activity globally (Opio et al, 2013; Gerber et al, 2013. These GHG emissions are in the form of carbon dioxide equivalent (CO 2e ) from: i) methane (CH 4 ) from enteric fermentation (28 %) and manure management (13 %); ii) crop and soil management in the form of nitrous oxide (N 2 O) from the use of nitrogenous fertilizer (58 %) and; iii) carbon dioxide (1%) (AguirreVillegas and Larson, 2017; Dangal et al, 2019; Oliveira et al, 2020.…”