Volatile fatty acid production was studied in the rumen and caecum of culled grey duiker (Sylvicapra grimmia) and in the rumen of tame fistulated duikers. The caecum had a higher total VFA concentration and production rate per unit volume than the rumen but when considering total volume the caecum was only 14 – 17% of the rumen values. The energy obtained from ruminal VFA was calculated to satisfy 36,1% and 74,9% of the basal metabolic energy requirements of field animals in summer and winter respectively. The total hindgut contribution (caecum + colon) would amount to 19% in summer and 30% in winter emphasizing the importance of fibre fermentation in the hindgut.