White‐clover herbage proved to be of relatively high digestibility and it was possible to predict the digestibility of mixed grass and clover herbages from a knowledge of the digestibility and proportions of the components. Lucerne proved to be of low digestibility. Aftermath herbage was not so highly digestible as first cuts; and in autumn digestibility falls slowly as herbage ages. Digestibility was unrelated to the nitrogen content of herbage. In three trials no significant differences were found between the digestive efficiencies of wether sheep and dairy cows, while hormone implantation, although affecting animal metabolism, failed to influence feed digestibility. Restricted feeding at 50% of thead libitumintake resulted in a slight increase in the apparent digestibility of herbag