Breeding the whole crop siliage rice cultivar basically requires priority in high biomass and grain yield and tolerance biotic and abiotic stresses. In this context, AA genome wild rices are potential resources to broaden genetic variability for whole crop silage cultivar. We have developed several introgression populations from crosses with three AA genome wild rices, O.glaberrima, O.rufipogon, and O.longistamina. Among these populations, the three BC4F8 near isogenic lines (NILs) derived from a cross of Milyang 23 and O.glaberrima(acc. 101154) could produce the high-yielding lines surpassing Milyang 23 by 20% in grain yield. Introgression lines from crosses with 4 accessions of O.rufipogon with japonica rices, Hwaseongbyeo and Ilpumbyeo had huge agronomic variability and very tall and vigorous lines possessing culm length of 125 ∼ 187cm were selected as promising potential parents to improve biomass of existing cultivars. These selections with high yield potential and biomass will be crossed to create another gene pool to combine high yield and biomass and anther culture breeding could be useful to develop genetically fixed F2 lines with both traits.