The experiment was carried out on twelve pigs with an initial body weight (BW) of about 10 kg. After adaptation the pigs were fitted with a PVTC cannula and fed either of two basal diets (6 pigs each) differing in metabolizable energy content (diets A and B, 13.5 and 14.5 MJ ME/kg, respectively). The diets were formulated (using the same ingredients) to contain 0.6 g ileal digestible lysine/MJ ME and the recommended level of other essential amino acids (AA). Apparent ileal digestibility coefficients of AA were determined for two growth periods at about 15 kg (period I) and 25 kg body weight (period II). Similar digestibility values were found for both diets. The average AA digestibility coefficients were somewhat higher in period II, as compared with period I, however, the differences were not significant. Of the limiting essential AA, digestibility values for both diets and periods were highest for methionine (80.9 to 82.9%) and lowest for threonine (71.1 to 73.9%). Intermediate values were found for lysine and tryptophan (78.6 to 80.0 and 75.2 to 78.6%, respectively). It was concluded that average AA digestibility values of both periods should be used for formulation of experimental diets in a subsequent experiment on pigs from 10 to 30 kg body weight.