Enteric methane emissions from zebu cattle are influenced by seasonal variations in rangeland fodder quality and intake

Gbenou Gérard Xavier, Assouma Mohamed Habibou, Bastianelli Denis, Kiendrebeogo Timbilfou, Bonnal Laurent, Zampaligre Nouhoun, Bois Bérénice, Sanogo Souleymane, Sib Ollo, Martin C., Dossa Luc Hippolyte. 2024. Enteric methane emissions from zebu cattle are influenced by seasonal variations in rangeland fodder quality and intake. Animal (Cambridge), 18 (10):101320, 11 p.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Rangeland fodder resources used to feed ruminants in the Sahel decline considerably in both quantity and quality from the wet to dry seasons. While it is widely assumed worldwide that this seasonality of fodder supply impacts intake levels and therefore enteric methane (eCH4) emissions, there are very few references based on in vivo measurements of eCH4 in this region. The purpose of this study was to test the assumption that the seasonality of fodder supply impacts intake levels and consequently eCH4 in ruminants. Thus, eCH4 was measured in vivo in Sudanese Fulani zebu cattle during three main seasons of the year (wet season: WS, cold dry season: CDS, and hot dry season: HDS). The experiment was carried out on 10 steers aged 32 months with an average (± SD) initial BW of 138 ± 5.8 kg (i.e. 0.55 Tropical Livestock Unit − TLU) and kept in individual pens. Animals were fed with natural rangeland fodder harvested each season following herders' practices, i.e. green fodder in the WS and dry fodder hay in the CDS and HDS. Different levels of fodder were offered to the animals to reproduce the gradient of fodder availability on rangelands over the year (six trials): 3.3% BW during the CDS; 3.3, 2.3, and 1.4% BW successively during the HDS; and 2.3% in two sequential studies in the WS. Each trial lasted 3 weeks, split into 2 weeks of fodder adaptation and 1 week of data collection. The BW, quantity of voluntary DM intake, digestibility of DM digestibility and of OM digestibility, and eCH4 (GreenFeed® system) were measured for each animal. Fodder composition varied considerably between seasons (P < 0.05). The DM intake (g/kg BW per day) varied from 23.9 in CDS to 15.7 in HDS and 22.3 in WS (P < 0.001). The DM digestibility varied from 0.50 in CDS to 0.46 in HDS and 0.57 in WS. The eCH4 yields (g/kg DM intake per day) varied significantly from 25.2 in the CDS to 31.8 in the HDS and 20.5 in the WS. When extrapolated over a full year and irrespective of season, eCH4 emissions for steers amounted to 68.1 g/d (24.6 g/kg DM intake per day, 46.7 ± 3.34 kg of eCH4/TLU per year). Variations in the various parameters recorded in different areas and during the main seasons must therefore be accounted for in national inventories to refine eCH4 data for ruminants in Sub-Saharan Africa.

Mots-clés Agrovoc : zébu, variation saisonnière, parcours, prise alimentaire (animaux), alimentation des animaux, méthane entérique, bovin, alimentation humide, comportement alimentaire, comportement animal

Mots-clés géographiques Agrovoc : Sahel, Afrique au sud du Sahara, Burkina Faso

Mots-clés libres : Alimentation des animaux, Méthane entérique, Ressources fourragères, Bilan carbone

Agences de financement européennes : European Commission

Projets sur financement : (EU) Carbon Sequestration and Greenhouse Gas Emissions in (Agro) Sylvopastoral Ecosystems in the Sahelian CILSS States (CaSSECS)

Auteurs et affiliations

• Gbenou Gérard Xavier, CIRAD-ES-UMR SELMET (FRA)
• Assouma Mohamed Habibou, CIRAD-ES-UMR SELMET (BFA) ORCID: 0000-0002-8163-0340 - auteur correspondant
• Bastianelli Denis, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0002-6394-5920
• Kiendrebeogo Timbilfou, CNRST (BFA)
• Bonnal Laurent, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0001-5038-7432
• Zampaligre Nouhoun, CNRST (BFA)
• Bois Bérénice, Université de Montpellier (FRA)
• Sanogo Souleymane, CIRDES (BFA)
• Sib Ollo, CIRAD-ES-UMR SELMET (SEN) ORCID: 0000-0001-6382-6692
• Martin C., INRAE (FRA)
• Dossa Luc Hippolyte, UAC (BEN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/611055/)

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