Horse milk could soon be coming to a doorstep near you after demand for the nutritionally rich product has surged across mainland Europe.

Although almost unknown in parts of the world, the milk used to be so popular in Germany that during the First World War it was delivered door to door.

It is now back in favour with health-conscious consumers because it is rich in vitamins and minerals, is easily digested and has just 1.5 per cent fat, compared with 3.7 per cent for cow's milk. It is also priced as a delicacy, with a litre costing as much as $A16.60.