A longitudinal study was carried out between February 2007 to September 2015 in Algiers province and 3 neighboring provinces namely Blida, Boumerdes and Tipaza. It included 492 cows from 43 farms (42 private farms, and one farm from State technical livestock institute), the farm size varied from 3 to 115 dairy cows, including the control lot (T) without retained placenta, the number of cows having aborted was thirty (30) cows. Six reproductive parameters were analysed in this study: the calving-1st heat interval (CFHI), the calving-1st insemination interval (CFII), the calving-fertilizing insemination interval (CCI), the success rate in 1st heat insemination (CR1IA), the percentage of cows requiring 3 or more inseminations to be pregnant or those not pregnant after two inseminations (%3IA) and the percentage of cows culled for infertility (CRI). The main factors affecting cow reproductive performances were the body condition score (BCS), the type of mating (Artificial insemination versus natural mating), occurrence of reproductive and metabolic disorders. Furthermore, the main causes of culling were infectious diseases like IBR.