The experiment in this study was conducted to compare dietary preference for lysine (Lys) in piglets when position of two diets offered for a choice was switched repeatedly between the feeders or when diet position remained unchanged throughout the experimental period. The data obtained from this experiment showed that piglets are able to differentiate between diets varying in their Lys concentration and to show preferences for a diet more adequate
in Lys concentration over a Lys-deficient diet. Under the experimental conditions given in this study it seems
not necessary to change diet position between feeders to exclude influences of positional cues on feeding behavior. However, for other choice feeding experiments possibly comparing feeds involving other mechanisms of choice than in the present study, it would probably be more rigorous to change frequently diet position between feeders to ensure conclusions.

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