Abstract
Different cattle production interventions have been proposed to reduce greenhouse gas (GHG) emissions and increase animal productivity, but few studies have identified their real potential under grazing conditions and at the whole system level. The aim of this study was to determine the effect of silvopastoral systems (SPS) with Leucaena leucocephala on total GHG emissions, emission intensity, GHG balance and cattle productivity in a series of production scenarios in northern Colombia. A life cycle analysis (LCA) approach was used to evaluate one baseline system (BL) based on pastures and four SPS intervention scenarios. For this analysis, the emissions from enteric fermentation and manure were determined in situ. Methane emissions from enteric fermentation were 9.7% lower in the SPS with leucaena than in BL systems (p = 0.0369). Emission factors for manure were higher in the BL systems (p < 0.05) as were emission intensities to produce one kg of fat and protein corrected milk (FPCM) and one kg of live weight gain (LWG). For animal production and GHG balance, it was found that the inclusion of leucaena increased animal production up to four times compared to the BL system and mitigated GHG emissions per hectare up to 86% due to carbon sequestration. In conclusion, leucaena SPSs are an alternative to mitigate climate change under grazing conditions, as they reduce GHG emissions and increase animal productivity.
Abstract
Different cattle production interventions have been proposed to reduce greenhouse gas (GHG) emissions and increase animal productivity, but few studies have identified their real potential under grazing conditions and at the whole system level. The aim of this study was to determine the effect of silvopastoral systems (SPS) with Leucaena leucocephala on total GHG emissions, emission intensity, GHG balance and cattle productivity in a series of production scenarios in northern Colombia. A life cycle analysis (LCA) approach was used to evaluate one baseline system (BL) based on pastures and four SPS intervention scenarios. For this analysis, the emissions from enteric fermentation and manure were determined in situ. Methane emissions from enteric fermentation were 9.7% lower in the SPS with leucaena than in BL systems (p = 0.0369). Emission factors for manure were higher in the BL systems (p < 0.05) as were emission intensities to produce one kg of fat and protein corrected milk (FPCM) and one kg of live weight gain (LWG). For animal production and GHG balance, it was found that the inclusion of leucaena increased animal production up to four times compared to the BL system and mitigated GHG emissions per hectare up to 86% due to carbon sequestration. In conclusion, leucaena SPSs are an alternative to mitigate climate change under grazing conditions, as they reduce GHG emissions and increase animal productivity.
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