Promising nutritional strategies to reduce enteric methane emission from ruminants – a meta-analysis
2019
Arndt, Claudia | Hristov, Alexander N. | Mcclelland, Shelby C. | Kebreab, Ermias | Oh, Joonpyo | Bannink, André | Bayat, Ali R. | Crompton, Les A. | Dijkstra, Jan | Eugène, Maguy | Martin, Cécile | Kreuzer, Michael | Mcgee, Mark | Reynolds, Christopher K. | Schwarm, Angela | Shingfield, Kevin J | Yáñez-Ruiz, David R. | Yu, Zhongtang | Veneman, J. B. | Newbold, C. James | Centro Agronomico Tropical de Investigacion y Enseñanza (CATIE) | Department of Animal Science ; Pennsylvania State University (Penn State) ; Penn State System-Penn State System | Colorado State University [Fort Collins] (CSU) | Department of Animal Science ; University of California (UC) | Livestock Research ; Wageningen University and Research [Wageningen] (WUR) | Natural Resources Institute Finland (LUKE) | School of Agriculture, Policy and Development ; University of Reading (UOR) | Animal Nutrition Group ; Department of Animal Science ; Wageningen University and Research [Wageningen] (WUR)-Wageningen University and Research [Wageningen] (WUR) | Unité Mixte de Recherche sur les Herbivores - UMR 1213 (UMRH) ; Institut National de la Recherche Agronomique (INRA)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS) | Department of Agricultural Science ; University of Naples Federico II = Università degli studi di Napoli Federico II | Teagasc Agriculture and Food Development Authority (Teagasc) | Institute of Agricultural Sciences ; Ecole Polytechnique Fédérale de Zurich | Institute of Biological, Environmental and Rural Sciences (IBERS) ; Biotechnology and Biological Sciences Research Council (BBSRC)-Aberystwyth University | Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | Department of Animal Sciences ; University of Illinois at Urbana-Champaign [Urbana] (UIUC) ; University of Illinois System-University of Illinois System | Aberystwyth University
International audience
显示更多 [+] 显示较少 [-]英语. Decreasing enteric CH4 emissions is important in mitigating the environmental impact of livestock farming. The present meta-analysis examined effects of nutritional mitigation practices on absolute CH4 emissions (g/animal/d) and CH4 yield [g CH4/kg dry matter intake (DMI)] as well as on DMI (kg/d), average daily gain (kg/d), milk production (kg/d), and neutral detergent fiber digestibility (%). The database for this analysis consisted of over 400 studies. Only studies that reported statistical variance were included in the analysis (295 studies and 644 treatment mean comparisons). A standard random-effects meta-analysis weighted by inverse variance was carried out. The effects of the standardized mean difference (SMD) were classified as small (≤-0.2 and >-0.5), medium (≤-0.5 and >-0.8), and large (≤-0.8). Of the analyzed treatments, inclusion of chemical inhibitors, electron sinks, and lipids had a large effect on absolute CH4 emissions (-2.1 ± 0.5, -1.6 ± 0.2, and -1.3 ± 0.2 SMD ± SE, respectively; P <0.001) and CH4 yield (-1.8 ± 0.3, -1.2 ± 0.2, and -1.0 ± 0.1 SMD ± SE, respectively; P <0.001). The inclusion of chemical inhibitors did not impact animal productivity (P >0.15), whereas electron sinks and lipids led to a small decrease in DMI (-0.2 ± 0.1, and -0.4 ± 0.1 SMD ± SE, respectively; P ≤0.01) without affecting animal productivity (P >0.05). Although these nutritional strategies effectively reduced CH4 emissions without compromising animal productivity, their adoption will largely depend on their economic feasibility.
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