The effect of calcium soap supplementation on the puberty attainment was investigated in twelve Rahmani e e-lambs of 6-7 months of age and average body weight 24.75±0.16 Kg. Animals were allocated into two groups of 6 ewe-lambs each; the first group kept as a control and received the basal diet while the animals in the second group received the basal diet supplemented with 3% calcium soap for twelve weeks. During the study period, two types of samples from each animal were obtained; weekly blood samples from which sera were separated and used for assaying of blood metabolites and progesterone and rumen juice samples which were collected twice, the first collection was taken in the middle of the study period (the 6lh week) and the second one at the end of the study (the I 12^th week). The results revealed that calcium soap supplemented Rahmani ewe-lambs attained puberty 5 weeks earlier than control ones; this earlier puberty attainment may be due to the possible beneficial effects of calcium soap at both rumen metabolic pool, which was characterized by increased rumen propionate concentration, decreased  methane  production and decreased ammonia nitrogen concentration, and general metabolic pool as indicated by increased serum glucose, total lipids, total cholesterol and high density lipoproteins and de­ creased · urea concentrations. In summary, the beneficial effects of calcium soap supplementation at rumen and general metabolic pools led to improvements in the energy and lipid status of the supplemented Rahmani ewe lambs and earlier attainment of puberty; this may be through the in­ creased trophic signals of hypothalamo-pituitary origin to the ovary together with increased provision of energy yielding substrate (s) and steroid hormones precursors.