For part 1 see Abst. 5835, Vol. 38. 2. The trial was with Blackhead Persian x Dorset Horn wethers of about 45 kg liveweight given the same Rhodes grass hay and the same supplements of protein and concentrate as described for cattle in part 1. Some were also offered hay alone. Voluntary intakes of hay increased as the amount of supplementary protein increased and reached a maximum when about 3.0 g digestible crude protein per kg W0.73 was given. Except when most concentrate was given, intake of hay was reduced when more concentrate was given and total intake of feed tended to remain unchanged with each intake of protein. Consequently maximum intakes of digestible energy were with a daily intake of about 30 g concentrate per kg W0.73. Sheep needed less protein and concentrate to reach maximum intake of feed than did cattle although cattle ate relatively more. Sheep seemed to be less tolerant of high intakes of protein and concentrate than cattle. Because of lower maintenance energy requirements, sheep tended to attain higher intakes than cattle.