Non-lactating sows are the only class of pig fed below appetite and can make use of bulky feeds including low dry matter materials such as liquid whey. Farmers who feed whey to pregnant sows from communal troughs complain of the difficulty of maintaining homogeneous body condition throughout the herd. The object of these experiments was to quantify the differences in intake between sows which produce this disparity and to indicate how feed dispensing systems might be controlled.