For Donkey's milk, the lipid fraction presented high levels of essential fatty acids.  A fatty acid is qualified "as essential" when the organism can only produce them in small quantities if  indeed at all; they must therefore be provided by everyday food and in the form of a suitable supplement, more or less enduring over time according to the circumstances.

Linoleic (omega 6) and linolenic (omega 3) acid respectively represent 8.15 and 6.32% of total fatty acids.  The presence of polyunsaturated fatty acid makes Donkey's milk superior in relation to cow's milk (only 2.9% of total fatty acids) getting closer to mother's milk (11.3% on average for total fatty acids) by the contribution of essential fatty acids (INRA publication, issue: G Freud).

These essential fatty acids present significant advantages insofar as they contribute to the development of the brain and the retina. Omegas 3 play a major role with regards our heart, since they participate in the correct working of the cardiovascular system, they help to fight against thrombosis (forming of blood clots), heart rhythm disorders and would be of precious help in preventing risks following a cardiac accident.

Some recent studies would even attempt to prove the beneficial role of these fatty acids in fighting against the appearance of Alzheimer's as well as certain cancers.

As for omegas 6, they are significant on a cosmetic level.