Journal of Rangeland Science (JRS) Chemical Composition, in Situ Degradation, and Fermentation Kinetics of Some Browse Plant Species Collected From Algerian Arid And Semi-Arid Areas Volume 10 (2020) Issue 2, April 2020 2024 01 30 Chemical Composition, in Situ Degradation, and Fermentation Kinetics of Some Browse Plant Species Collected From Algerian Arid And Semi-Arid Areas EN Souhil Boufennara Department of Cellular and Molecular Biology, Faculty of Nature Sciences, University Abbès Laghrour of Khenchela, 40000. Khenchela, Algeria 0000-0002-2457-8398 Secunino Lopez Institute of Livestock of Mountain -CSIC- Department of Animal Production, University of Léon, 24007 León, Spain 0000-0001-6267-683X Souhil Boufennara Department of Cellular and Molecular Biology, Faculty of Nature Sciences, University Abbès Laghrour of Khenchela, 40000. Khenchela, Algeria 0000-0002-2457-8398 Laid Bebderradji University Mohamed Boudiaf of M’sila, faculty of Science, Department of SNV, 28000 M’sila, (Algeria) Raul Bodas Agricultural Technology Institute of Castilla and León, Subdirectorate for Research and Technology, Valladolid, Spain Hacene Bousseboua National Higher School of Biotechnology, University City of Ali Mendjeli P.O Box 66E RP 25100, Ali Mendjeli/Constantine (Algeria). Secundino Lopez Institute of Livestock of Mountain -CSIC- University of León, Department of Animal Production, University of Léon, 24007 León, Spain Journal Article 2024 01 30 The chemical composition and digestibility of twelve plant samples (Arthrocnemum macrostachyum, Atriplex canescens, Artemesia herba-alba, Astragalus gombo, Calobota saharae Ceratonia siliqua, Gleditsia triacanthos, Hedysarum coronarium, Medicago sativa, Ononis natrix L, Hordeum vulgare and Stipa tenacissima L.) grown in arid and semi-arid areas of Algeria were evaluated (in 2010). Feed components were determined by proximate analysis whereas phenolic and tannin compounds were analyzed by colorimetric procedures. Digestibility was assessed by conventional gravimetric in vitro and in situ methods. In general, crude protein content in dicotyledon (dicots) species was always greater than that in monocotyledon (monocots) grass showing higher Neutral and Acid Detergent Fiber (NDF and ADF) and lower lignin contents than dicots. The tannin concentration varied considerably between species, but in general, the plants investigated in this study had low tannin contents (except for Ceratonia siliqua, Gleditsia triacanthos and Hedysarum coronarium). Monocots showed lower in vitro and in situ, fermentation rate and cumulative gas production than dicots species. This study indicated that a large reserve of plant species in the local flora is available that could be potentially used for livestock feeding. These feeds, if fully exploited, could assist in increasing the level of production and productivity of the livestock resources in the region.