 The best of the Anglo-Norman trotting horses emerged between 1820 and 1870, with five major stallions becoming the foundation bloodstock for the French Trotter breed, which officially split from the Anglo-Norman breed in 1906.The continuing breeding goal of the Anglo-Norman was to maintain a balanced breed with input from Thoroughbred stallions and heavier mares of the original Norman type.By 1966, the Anglo-Norman breed had been further standardized and was described as averaging high, although sometimes taller.