The fertility of goats is one of the most important production traits in meet breeds. There are two important fertility traits, which are the litter size and period between parities (DMJ). On the basis of the questionnaire that was used by Boer goat breeders, we gathered information about rearing system from 23 conventional (K) and 5 organic (E) Boer goat breeders. Data from the questionnaire and fertility parameters data from the central database from Slovenian Breeding Program for Small Ruminants (CPZ) were analyzed with the statistical package SAS/STAT. The effect of the rearing system (K vs. E) on the fertility traits was determined. Goats in K have higher number of born kids per litter (1,74 ± 0,01) then goats in the E rearing system (1,49 ± 0,02). Period between parities was shorter in K (362 ± 3,3 days) compared to the E rearing system (402 ± 5,2 days). The questionnaire analyzed results determined that in both rearing systems prevailed an older population of breeders that breed smaller flocks which have small areas and lay in high hilly and mountainous landscape. From the answers of the questionnaire we found out that K breeders add additional feed to the goats diet compared to E breeders that don’t add extra feed. In addition we found out that K breeders adjust the goat diet regarding the category and the production phase of the animal, which could be the reason for the higher litter size in K, compared to E breeders. In both, K and E rearing systems, the year-round breeding system is used. In both systems, kids are weaned late (60-90 days late) which is why the DMJ is so long (around one year in both cases). The majority of the kiddings occurred in winter and spring, which points out that the Boer goats under the conditions prevailing in Slovenia are considered seasonally polyestrous with breeding season in autumn.