The influence of dietary energy concentration and feed intake level on feedlot steers: 1. Digestibility of diets and rumen parameters Slabbert, N.; Campher, J.P.; Shelby, T.; Kuhn, G.P.; Meissner, H.H. Suid-Afrikaanse Tydskrif vir Veekunde 22(4): 101-106 1992 https://eurekamag.com/research/009/589/009589470.php