Ayenew et al., 2009. Trop. Anim. Health Prod., 41: 1143-1150

Ayenew, Y. A.; Wurzinger, M.; Tegegne, A.; Zollitsch, W, 2009. Performance and limitation of two dairy production systems in the North western Ethiopian highlands. Trop. Anim. Health Prod., 41: 1143-1150