pasture grazing and fed a combination of silage and concentrates also had a higher content of n-3 unsaturated
fatty acids in intramuscular adipose tissue in comparison
with conventionally grown pigs given only the concentrate
feed (Nilzen et al., 2001). Similar results were recorded
in meat of rabbits grown under ecological conditions (Pla
et al., 2005). For the purpose of increasing the content of
n-3 unsaturated fatty acids, different fish and other sea
products, fish oil or fish meal and marine algae oil are
often added to feed. Possibility of production of genetically modified oleiferous plants and cereals by using the
genes of marine algae is widely discussed. Presumably, it
could increase the content of DHA in their fatty acid composition, and thus also in the daily diet of consumers. This
is one of the research priorities of an extensive and highly
valuable project of the European Union, which is based on
the studies of Tonon et al. (2003, 2005).