115	Prevalence, Causes, Treatment and Prophylaxis of Cow Infertility in Poland E. Malinowski Poland

116	Factors of Non-infectious Nature Affecting Early Foetal Loss in High Producing Dairy Herds in North-Eastern Spain F. López-Gatius1, O. Szenci2, G. Bech-Sábat1, I. García-Ispierto1, B. Serranod1, P. Santolaria1, J. Yániz1 1Spain, 2Hungary

117	Performance Parameters and the Predicted Economic Return of Jersey Holstein-Friesian Crossbred Cows in Australian Pasture-based Herds M. Pyman, K. Macmillan, G. Anderson Australia

118	Factors Influencing Fertility in German Dairy Herds E. Leitgeb1, R. Van saun2 1Germany, 2United States

119	Interrelationships between Production and Reproduction in German Dairy Cows E. Leitgeb1, R. Van Saun2 1Germany, 2United States

120	Comparison of the Efficiency of Different Treatment Regimes for Estrus Synchronization of Cows in the Mexican Tropic N. Pena, J. Ávila, J. Martínez, O. Hernández, A. Hernández Mexico