It is clear that the effects of animal feed on the nutritional
value (for mankind) of derived products destined for human
consumption is in fact much greater than the influence of
methods used to grow vegetables on their nutritional value. The
variety and the species of plant influence the compositions of
plant products much more than the growing methods. For
example, the polyunsaturated FA contents of peanut oils
produced from African and American peanuts are very
different. The same is true for olive oils. A study of olive
cultivars in Tunisia (18) showed that they differed significantly
in their contents of oleic and linoleic acids and ALA. This is
not so for animals, whose lipid reserve may be very sensitive to
the type of fatty acids obtained from the diet.