[Effect of time of administration of food supplement amino acids on protein utilization and the body composition of rats].

The effect of administration of amino acids enriching the diet on protein utilization and rat body composition was investigated. Net protein utilization (NPU) of the diet enriched by tryptophane, lysine or sulphur-containing amino acids comprised 0.408, 0.335 and 0.664. Changes in the time of administering the amino acids allowed NPU to be attained as 0.445, 0.352 and 0.716, respectively. It has been also shown that the time of administering the amino acids produces an effect on the rat body composition. The lowest fat content was recorded in the body with tryptophane given one hour before feeding the main diet, with lysine and sulphur-containing amino acids given one and two hours after feeding the main diet.