This study was conducted in Ber Al-Ajam village, on a private farm, with a group of Awassi sheep (76 ewes) in 2004-2005. A group of 57 lambs were selected out of single born lambs and divided into two groups according to sex. Each group was divided randomly into sub groups: control and experimental. At the beginning of the experiment, at three weeks age, there were no significant differences between the groups of lambs (p > 0.05).