Abstract
1. 1. Digestibilities of feed and turnover time (1/ k), transit time (TT) and mean retention time (MRT: 1/ k + TT) of fluid and particle markers were measured in maras ( Dolichotis patagonum) and guinea-pigs ( Cavia porcellus) fed a diet containing 50% alfalfa. 2. 2. The digestibility of fibre was similar in both animals, however, the digestibilities of crude protein (nitrogen × 6.25) and crude ash were lower in the mara than in the guinea-pig. 3. 3. 1/ k of the digesta markers were similar in both animals, suggesting that the two animals possess similar dilution and retention time of digesta in their caecum and proximal colon.
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