آزاده میرشمس الهی
مهدی نوری
محسن برجی
علی رضا طالبیان مسعودی
رمضان علی عزیزی
حسین غلامی

The present study was conducted on three farm in Arak city to investigate the effect of supplemental nutrition on reproductive efficiency of farahani ewes. In every farm, the half of the ewes were selected in control group and were food according to usual nutrition in this place without receiving any supplemental food. Another half of the ewes in these three farms, were received supplemental food (concentrate) in three experimental stages consist of : ) mating season ( weeks before of mating and weeks after that), ) . mounths of gestation , and ) Lactation stage. Body weight and Body condition score for whole of the ewes were measured before flushing in mating season and at the end of that. The means of body weight and body condition score in control ewes and supplemental food treatment ewes at the end of the first stage were . kg, . unit and . kg, . unit (P< . ) respectively. The supplemental nutrition in three experimental stages also had significant effect on birth weight and weaning weights of lambs. The means of the birth weight of lambs were . and . kg for the control ewes and the ewes of supplemental feeding treatment, respectively. The means of one to three mounths weights for lambs in control group were . , . and . kg and in supplemental feeding group were . , . and . kg that were significant. The fertility percent in control and supplemental feeding groups were . and . percent(P< . ) respectively. Lambs mortality for control and supplemental feeding groups were . and . % (P< . ) respectively. Keywords: Farahani ewe, Supplemental feeding, Fertility, Lambing,Weight, Body Condition score

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