This study examined the effects of cobalt supplementation, given from three months prepartum to nine months postpartum, on lactation performance, reproductive efficiency, blood biochemistry, colostrum immunoglobulin levels, and hormonal profiles in she-camels, along with the growth of their calves. Twenty Maghrabi she-camels, weighing 489 ± 2.31 kg and aged 6-9 years, were used in this study. The camels were divided into four groups: one control group fed only the basal diet, and three treatment groups receiving 0.16, 0.32, and 0.48 mg of cobalt per kg of feed as cobalt glucoheptonate. Results indicated that cobalt supplementation significantly increased colostrum immunoglobulin concentrations (IgG, IgM, and IgA), as well as monthly milk yield and lactation period. Milk contents of total solids, protein, and lactose also improved in the supplemented groups, particularly at 0.32 mg/kg cobalt. Additionally, pre- and post-partum serum cobalt, vitamin B