Friesian semen is once again being exported to countries with grass-based systems of milk production. The modern Friesian is pre-eminently a grazing animal, well able to sustain itself over many lactations, on both low-lying and upland grasslands, being developed by selective breeding over the last 100 years. Some outstanding examples of the breed have 12 to 15 lactations to their credit, emphasising their inherent natural fecundity. In response to demand, protein percentages have been raised across the breed, and herd protein levels of 3.4% to 3.5% are not uncommon.