Gbenou Gérard Xavier, Assouma Mohamed Habibou, Martin C., Bastianelli Denis, Bonnal Laurent, Kiendrebeogo T., Sib Ollo, Bois Bérénice, Sanogo Souleymane, Dossa Luc Hippolyte.
2023. Impact of fodder quality seasonality on enteric methane emission from cattle in Sub-Saharan Africa.
In : Book of Abstracts of the 74th Annual Meeting of the European Federation of Animal Science. EAAP
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Résumé : Sahel, pastures feed resources drastically decline both in quantity and quality from rainy to dry season. Several models to estimate enteric methane (eCH4) emission were developed but have low accuracy in Sahelian production systems. In order to improve these models, direct reference measurements are necessary. We aimed to measure in viva eCH4 emission in Sudanese peulh zebu during each season (rainy: RN, cold dry: CD, and hot dry: HO) of the year. The experiment was carried out (CIRDES, Burkina Faso) on 10 steers of 32 months old with liveweight (LW) of 147±5.8 kg (i.e. 0.59 Tropical Livestock Unit-TLU). Animals were kept in individual boxes. Individual eCH4 (GreenFeed system) and total tract digestibility were measured. The animals were fed with natural forage harvested from range lands in each season. Different levels of forage were offered by mimicking the gradient of forage availability on pastures during a year: 7% LW during the rainy season; 3.5% LW during the cold dry season; and 3.5, 2.5 and 1.5% LW during the hot dry season. Each trial lasted 3 weeks including 2 weeks of feed adaptation and I week of data collection. In RN, CD and HO, the average content of intake in crude protein (CP, g/kg DMI) was 65± 1.6, 48± 1.6, and 28± 1.1, respectively. Average content of intake in fibre (NDF, g/kg DMI) was respectively 6 19±29.0, 660± 17.4, and 712± 17.8. Dry matter intake (DMI, g/kg LW) was respectively 22± 1.4, 23± 1.5, and 16± 1.8 in RN, CD, and HO. The average OM digestibility (%) was respectively 56.9±3.04, 49.9±2. 12, and 46.2±3.08. Amounts of eCH4 (g/kg DMI) emitted was different with HO compared to others seasons: (33±7.9 vs 2 1±4.4 in RN and 25±4.7 in CD). A global calculation over a year revealed that in ex tensive systems of Sub-Saharan Africa, local zebus cattle fed on natural pastures emitted 44.9±3.34 kg of eCH4/TLU/year.
Auteurs et affiliations
- Gbenou Gérard Xavier, CIRAD-ES-UMR SELMET (FRA)
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Assouma Mohamed Habibou, CIRAD-ES-UMR SELMET (BFA)
ORCID: 0000-0002-8163-0340
- Martin C., INRAE (FRA)
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Bastianelli Denis, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0002-6394-5920
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Bonnal Laurent, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0001-5038-7432
- Kiendrebeogo T., CNRST (BFA)
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Sib Ollo, CIRAD-ES-UMR SELMET (BFA) ORCID: 0000-0001-6382-6692
- Bois Bérénice, CIRAD-ES-UMR SELMET (FRA)
- Sanogo Souleymane, CIRDES (BFA)
- Dossa Luc Hippolyte, UAC (BEN)
Autres liens de la publication
Source : Cirad-Agritrop (https://agritrop.cirad.fr/609343/)
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