In Northern Senegal, traditional cattle management systems (TRAD) which depend on natural forages coexist with intensified systems (INT) which rely on periodic supplementation with crop residues and local concentrates. This study aims to estimate the effects of seasons and management systems on the methane emissions of Gobra zebu, in relation to the diet’s chemical composition and feed intake. Six Gobra zebu cows per management system were individually monitored over 10 months, diet and faeces were sampled each season and their chemical composition and dry matter intake (DMI) were predicted by near infrared spectroscopy. Each diet was fermented in vitro to assess methane production and volatile fatty acid concentration. The DMI and digestible organic matter intake (DOMI) decreased (P < 0.0001) during the dry seasons for both systems in the same range, but INT improved the crude protein of the diets (P < 0.0001). Enteric methane production (mmol.g−1 dry matter) was lower for TRAD than INT, except during the rainy season when TRAD cows experienced a higher increase (P = 0.002). The methanogenic potential (methane production in vitro × DMI) varied with the seasons and the system with more accentuated variations for TRAD (P < 0.0001). Methanogenic potential shows true reflection of the effects of the seasons and management systems. The results highlight that enteric methane emissions varied with seasonal changes and that intensifying the diet induced no mitigating effect.
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The authors want to thank Denis Bastianelli, Laurent Bonnal from the CIRAD and Amadou Sow for their contribution to this research work.
Management of experimental animals followed the guidelines for animal research of the French Ministry of Agriculture and guidelines for animal experimentation in the European Union (European Commission, 2010). Approval number for ethical evaluation APAFIS#8218–2016121517182412 v1.
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Bois, B., Morgavi, D.P., González-García, E. et al. Indirect measures of methane emissions of Sahelian zebu cattle in West Africa, role of environment and management. Trop Anim Health Prod 52, 1953–1960 (2020). https://doi.org/10.1007/s11250-020-02212-x
- Cattle management
- Enteric methane
- Feed intake