In analytical chemical experiments as well as animal experiments the quality of two charges of krill meal produced in the scope of test hauls was tested in comparison to fish meal. The krill meal samples tested in our experiments with their minimal values per kg dry matter of approximately 640 g crude protein 48 g lysine and 20 g methionine + cystine are by all means comparable to fish meal of medium or good quality. The digestibility of the two krill meal samples was good. Krill meal of this quality can replace the fish meal quota in broiler feed. Analogously to fish meal, the quota of krill meal should not exceed 70 to 80 g per kg feed, on the one hand for reasons of nutrient economy and on the other hand in order to avoid a negative influence on the taste of the broiler meat. In addition to that, reference is made to storage problems of krill meal and mixed feeding containing krill meal and to the necessity of clarifying toxicologic problems.

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In a difference experiment the apparent precaecal (pc) and total intestinal (tot) nutrient digestibility and amino acid (AA) absorption of 5 yeasts (n-alkane yeasts Fermosin and Paprin, molasses/molasses distillers residue yeast, two sulfite waste liquor yeasts) were studied. The two n-alkane yeasts were very highly digested pc, the difference to tot digestibility is only small in most cases. In contrast to this, the pc and tot digestibility values of molasses/molasses distillers residue yeast differed considerably more. The probable reason for this is too hot drying due to which pc digestibility, particularly of the crude protein, and pc AA absorption are considerably reduced. In the two sulfite waste liquor yeasts, sulfite waste liquor residues containing lignin impair especially the crude carbohydrate digestibility and the energetic feed value; the better processing conditions of origin A, however, reduced considerably the negative effects. The results confirm that each yeast origin has its specific particularities, which have to be taken into consideration when they are used in feeding.

The digestibility of the nutrients of Fermosin was tested on pigs and the following values were ascertained: organic matter=86%, crude protein=89% and N-free extractives=83%. The net energy ascertained on the basis of the content of nutrients and the digestibility of the nutrients of Fermosin amounts to 617 energetic feed units for pigs/kg dry matter. The true digestibility of the amino acids of Fermosin was determined on pigs and chicken. For lysin the true digestibility was ascertained as 95% (pigs) and 73% (Broilers). Due to the different digestion abilities of the two animal species, corresponding differences in the digestibility of the other amino acids were found as well.

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