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• W3081639798 endingPage "142029" @default.
• W3081639798 startingPage "142029" @default.
• W3081639798 abstract "Agriculture, and livestock production in particular, is criticized for being a contributor to global environmental change, including emissions of greenhouse gases (GHG). Methane (CH 4 ) from grazing ruminants accounts for most of livestock's carbon footprint because a large share of them are reared under suboptimal grazing conditions, usually resulting in both low herbage intake and animal performance. Consequently, the CH 4 quota attributed to animal maintenance is spread across few or no animal outputs, increasing the CH 4 intensity [g CH 4 /kg live weight (LW) gain or g CH 4 /kg milk yield]. In this review, the generalized idea relating tropical pastures with low quality and intrinsically higher CH 4 intensity is challenged by showing evidence that emissions from animals grazing tropical pastures can equal those of temperate grasses. We demonstrate the medium-to-high mitigation potential of some grazing management strategies to mitigate CH 4 emissions from grazing ruminants and stress the predominant role that sward canopy structure (e.g., height) has over animal behavioral responses (e.g., intake rate), daily forage intake and resulting CH 4 emissions. From this ecological perspective, we identify a grazing management concept aiming to offer the best sward structure that allows animals to optimize their daily herbage intake, creating opportunities to reduce CH 4 intensity. We show the trade-off between animal performance and CH 4 intensity, stressing that mitigation is substantial when grazing management is conducted under light-to-moderate intensities and optimize herbage intake and animal performance. We conclude that optimizing LW gain of grazing sheep and cattle to a threshold of 0.14 and 0.7 kg/day, respectively, would dramatically reduce CH 4 intensity to approximately 0.2 kg CH 4 /kg LW gain, as observed in some intensive feeding systems. This could represent a mitigation potential of around 55% for livestock commodities in pasture-based systems. Our results offer new insights to the debate concerning mitigation of environmental impacts of pastoral ecosystems. • C3 or C4 forages can drive similar CH 4 intensity under good grazing practices. • Optimizing intake is mandatory for CH 4 mitigation in grazing conditions. • Live weight gain thresholds are required to assure low CH 4 intensities. • Grazing animals can have CH 4 intensities as low as those of some confined animals. • Sound grazing practices could lower CH 4 intensity of ruminant by 55%." @default.
• W3081639798 created "2020-09-08" @default.
• W3081639798 creator A5004047518 @default.
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• W3081639798 creator A5080167705 @default.
• W3081639798 date "2021-02-01" @default.
• W3081639798 modified "2023-10-17" @default.
• W3081639798 title "Does grazing management provide opportunities to mitigate methane emissions by ruminants in pastoral ecosystems?" @default.
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