Impact of tannin-rich forages on biogas and methane emissions from sheep manure managed anaerobically - Udo, N.S; Vihowanou, Gaius; Idibu, Joachine; Garcia, Edward; Gakige, Jesse Kagai; Kiprotich, Linus; Mwangi, Stanley; Lind, Vibeke; Leitner, Sonja; Arndt, Claudia; Mulat, Daniel (International Livestock Research Institute, 2025)