Indirect measures of methane emissions of Sahelian zebu cattle in West Africa, role of environment and management

Bois Bérénice, Morgavi Diego P., Gonzalez-Garcia Eliel, Genestoux Lucette, Lecomte Philippe, Ickowicz Alexandre, Doreau Michel. 2020. Indirect measures of methane emissions of Sahelian zebu cattle in West Africa, role of environment and management. Tropical Animal Health and Production, 52 (4) : 1953-1960.

https://doi.org/10.1007/s11250-020-02212-x

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Quartile : Q2, Sujet : VETERINARY SCIENCES / Quartile : Q3, Sujet : AGRICULTURE, DAIRY & ANIMAL SCIENCE

Résumé : 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.

Mots-clés Agrovoc : zébu, vache, bovin, climat semi-aride, prise alimentaire (animaux), émission de méthane, variation saisonnière

Mots-clés géographiques Agrovoc : Sénégal, Sahel

Mots-clés complémentaires : Système pastoral

Mots-clés libres : Cattle management, Enteric methane, Feed intake, Sahel

Classification Agris : L51 - Physiologie animale - Nutrition
L02 - Alimentation animale

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement européennes : European Commission

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