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In order to measure the reproductive performances and numerical productivity of Ouled Djellal ewes, and to determine the influence of non-geneticfactors onthese parameters, a database wasestablished, by monitoring 2710 ewes, belonging to 12 farms, representative of two dominant modes of reproduction in the Chlef region. Body condition scores  (BCS)  of groups ofewes  put in  reproduction  were  carried out  to  compare the  performances under  breedingconditions. Thestudy showed a fertility and prolificacy of 91.04% and 115.35% in the breeding mode of lambing per year  in  spring,  against  59.35%  and  103%  in  the traditionalsystem  with lambingspread  over  the  year  (the  ram  is permanently present in the herd). The body condition and body reserves of the ewes varied according to the lambing season and the farmsmanagement (feed system). The interaction between the body condition of the ewes at mating and their reproduction performances was evident. Indeed, as BCS at mating increased, fertility, prolificityand productivity improved. The ewes with BCS at mating higher than or equalto3 produced the best performance, whereasthe ewes with BCS lower than 3, were less fertile, less prolific and less productive. On average the productivity of Ouled Djellal ewes was  105.03%  and  61.10%,  respectively,in  the  first  and  second  mode  of  reproduction.  The  main  sources  of variation as well as their interactions, were highlighted in this study.

Reproductive performance and numerical productivity of Ouled Djllal ewes