The Lipizzan breed suffered a setback to its population when a viral epidemic hit the Piber Stud in 1983. Forty horses and 8% of the expected foal crop were lost. Since then, the population at the stud increased. By 1994, 100 mares were at the stud farm and a foal crop of 56 was born in 1993. In 1994, the rate of successful pregnancy and birth of foals increased from 27 to 82%; the result of a new veterinary center. In 1996, a study funded by the European Union Indo-Copernicus Project assessed 586 Lipizzan horses from eight stud farms in Europe, with the goal of developing a "scientifically based description of the Lipizzan horse". A study of the mitochondrial DNA (mtDNA) was performed on 212 of the animals, and those studied were found to contain 37 of the 39 known mtDNA haplotypes known in modern horses, meaning that they show a high degree of genetic diversity. This had been expected, as it was known that the mare families of the Lipizzan included a large number of different breeds, including Arabians, Thoroughbreds, and other European breeds.