Dr Malcolm Eykyn with some of his herd of Dexter cattle. A HERD of rare breed Dexter cattle has been used in a two-year research project into the nutritional benefits of meat from cattle fed only on grass. The research, which included detailed analysis of sirloin meat taken from six animals in the herd near Barford, where Dr Malcolm Eykyn has been breeding Dexter cattle for 20 years, found it contained vital minerals, vitamins and fats essential for a balanced human diet. The two-year project was carried out by post-doctoral research scientist Dr Sarah Morgan, under the direction of Professor Michael Lee, one of the acknowledged global leaders in grass-only fed ruminant research, based at the worldâs oldest and largest agricultural research institute Rothamsted Research in Devon.