Low availability of feedstuffs with high quality amino acid patterns is a major drawback of organic pig production. With the total ban of non-organic feeds from 2012 on, the traditional feeding strategies should be reconsidered, particularly with regards to diets for highly productive animals. In this work, the usual optimization of diets is compared with a feeding strategy which permits moderate deficiencies or imbalances in amino acid supply in favour of lower feed costs whilst accepting reduced animal performance. The analysis of feeding practice in organic pig production in Austria reveals that the amino acid supply according to conventional recommendations is still possible with 100 % organic feeds. Yet, these diets tend to demand greater efforts with regards to provision of feedstuffs and diet planning and feeding costs increase. For the evaluation of a feeding strategy which accepts moderately imbalanced diets, the estimation of the expected reduction in animal performance compared to pigs fed according to recommendations is crucial. Under imbalanced feeding conditions, fattening pigs are likely to have a lower growth performance in the magnitude of a few percent and their lean meat content is expected to be lower by two or three percentage points. For piglet production, only minor decreases in the range of five percent are to be expected in nursing performance whereas more distinct effects on fertility traits (days empty +15 %, number of live born piglets 10 %) are likely. However, a feeding strategy with imbalanced amino acid supply for the benefit of lower feeding costs is possible from the animals point of view. Even with moderate dietary deficiencies animals can still perform reasonably well.