Mann et al., 1987. J. Anim. Sci., 64: 880-886 Document reference Mann, D. L. ; Goode, L. ; Pond, K. R., 1987. Voluntary intake, gain, digestibility, rate of passage and gastro-intestinal tract fill in tropical and temperate breeds of sheep. J. Anim. Sci., 64 (3): 880-886Web http://www.journalofanimalscience.org/content/64/3/880Citation key Mann et al., 1987