The growth rate of Arabi lamb during the suckling period (from birth to weaning at about day 100) is very slow particularly for lambs born in the autumn (Dabiri, 1999). Poor quality and limited quantity of feed for lactating ewes in free grazing system was shown to limit milk production, which was the main reason for slow lamb growth (Dabiri and Mosavi 2000). On the other hand, in conventional Iranian sheep production systems, offering a limited quantity of low quality supplemental (Sup) feed (or even no supplemental feed) to the lactating ewes was an important factor for severe reduction of the growth rate of the wool of lactating ewes during the autumn season (Dabiri, 2002). It was hypothesized that offering a high quality supplemental feed to ewes for a short period during early lactation would improve the growth rate of lambs and may alleviate the poor wool growth rate of lactating ewes during the autumn season. Therefore, the aims of this experiment were to 1) compare the growth of lambs suckled from experimental supplemented ewes with the growth of lambs suckled from conventionally ewes, and 2) compare the wool growth of lactating (wet) ewes with non-lactating (dry) ewes during autumn season