Cilliers et al., 1998. Anim. Prod., 59: 309-313 Document reference Cilliers, S. C. ; Hayes, J. P. ; Maritz, J. S. ; Chwaliborg, A. ; du Preez, J. J., 1998. True and apparent metabolizable energy values of lucerne and yellow maize in adult roosters and mature ostriches (Struthio camelus). Anim. Prod., 59: 309-313Web http://dx.doi.org/10.1017/S0003356100007807Citation key Cilliers et al., 1998