1. Fertility in mares in state studs;Byszewski,1983
2. Breeding and veterinarian inspection. Statistic analysis concerning 1699 mares;Blanchard;Courses Elevage,1974
3. Twinning and fertility in thoroughbred mares;Kudlac;Zuchthygiene,1963
4. Comparison of the time of pregnancies, month of the birth and the age of mares with consideration of their racing performance, as well as investigation of twinnings and loses among foals;Scharnhölz,1976
5. Comparison of the time of pregnancies, month of the birth and the age of mares with consideration of their racing performance, as well as investigation of twinnings and loses among foals;Scharnhölz,1976