Studies on the suitability of false flax expeller as feedstuff .1. Communication: Feeding value and incorporation limits for pigs.

To evaluate the feeding value of false flax expeller (FFE) for pigs, nutrients (crude nutrients, amino acids and fatty acids) were analyzed and their digestibility was determined with 6 growing pigs, by means of difference technique. Additionally, a feeding trial followed by slaughter investigations was performed with a total of 60 pigs (25-120 kg liveweight) to study the influence of increasing levels of FFE in diet (0%, 5%, 10%) on growth rate, slaughter performance and meat quality. The FFE used in these experiments was found to have 287 g digestible crude protein and 13.9 MJ MB per kg dry matter. Results of the feeding trial show depression of growth rate, when the percentage of FFE exceeds 5% in diets. Average daily liveweight gain. decreased from 758 g (controls) to 725 g (10% FFE) and costs of metabolizable energy increased from 38.9 MJ to 39.7 MJ per kg liveweight gain. Additionally, metabolic burdens, indicated as increased liverweights, up to 16% were observed. Due to the high polyenic fatty acid contents of FFE oil consistancy of carcass fat deteriorated with increasing FFE consumption. The percentage of polyenic fatty acids in total fatty acids of back fat increased from 11.5% (controls) to 14.7% (10% FFE). The taste of meat was negatively influenced as well. The percentage of meat samples tasting atypically increased from 3% (controls) to 18% (5% FFE) and to 36% (10% FFE).