Abstract Swine waste was mixed and ensiled with integral cassava tuber meal in the following proportions on a wet basis to obtain about 40% moisture content: 42:58, 53:47, 65:35 and 80:20. The mixtures (1 kg each) were packed in double polyethylene bags 1 mil thick, individually sealed and stored at 28 ±2° C. After fermentation for 42 days, the polyethylene bags were opened and samples from the central part of the bags were analysed to determine proximate composition and fermentation characteristics of the mixture. Acid production in the ensiled mixtures was directly related to the level of tuber meal combined with swine waste. Mixtures with 47 parts or more of tuber meal achieved pH values of 4·5 or less. After fermentation, the 53:47 mixture achieved pH 4·5 and contained 6·6% lactic acid and 2·4% volatile fatty acid (VFA). The proximate composition of the mixture was (dry matter basis) 8·6% crude protein, 7·9% crude fiber, 6% ash, 2·7% ether extract and 74·8% nitrogen-free extract. Mixtures of swine waste and cassava tuber meal might have potential value as an alternate, low-cost feed resource.