[Use of free fatty acids in animal nutrition].

The description of the processes of absorption of free fatty acids in monogastric animals and in ruminants is the first part of the review. The feeding problems of free fatty acids are discussed in the second part. In pig diets is a level up 6% free fatty acids in the dry matter of the ration not disadvantageous. In the feeding of ruminants additionally free fatty acids reduce the fermentation processes in the rumen. Only protected free fatty acids (Ca-fatty acids) are favourable in feeding systems for high yielding cows.