to study the effect of zeranol on some productive and reproductive traits, a total of 42 Ossimi sheep of 16-18 kg. initial weight were divided into two groups balanced according to weight and sex, with or without zeranol implant (12 mg). Animals were weighted monthly and body measurements were recorded. Three male sheep were slaughtered from each group. REPRODUCTIVE TRAITS IN EGYPTIAN SHEEP. Conception rate was recorded for females. The treatment groups had a rapid growth (p < 0.01) and a significant higher (P<0.05), body length, body leight and width at hooks than control group. Carcass quality was better with zeranol implant. Coneption rate was higher (p < 0.1) and at earlier age in the treated ewe lambs with Zeranol than non implanted ones.