Livestock feeding systems and feed gaps across three agro-ecologies in Tanzania - Paul, Birthe K.; Birnholz, Celine A.; Nzogela, B.; Notenbaert, An Maria Omer; Herrero, Mario; Bwire, Julius M.N.; Groot, Jeroen C.J.; Tittonell, Pablo A. (International Center for Tropical Agriculture, 2017)