Utilization of monensin in protein-energy licks by lactating ewes on sour winter veld; (b) Postweaning. High (HEL) and low (LEL) energy protein licks, with and without monensin, were fed to Dohne Merino ewes before and after weaning on Dohne sourveld during the winter. Creep feed and growth rations with and without monensin, were fed to the lambs. The experimental design provided for three sets of 2 x 2 factorial treatments with 20 animals per treatment. On average the ewes consumed daily 196% more of the HEL (309 vs 104 g; P ≤ 0,01). Monensin in general suppressed the lick intakes (235 vs 179 g; P ≤ 0,01) and the suppressing effect was higher on the HEL (350 vs 267 g; P ≤ 0,01) than on the LEL (119 vs 90 g; NS). Ewes showed a higher daily loss in body mass on the LEL (31 vs 13 g; P ≤ 0,05) but the effect of monensin was not significant over the three-year experimental period. Monensin tended to suppress the creep intake by 13,7% (733 vs 850 g; NS) and the growth rations intake by 0,8% (1312 vs 1323 g; NS). Preweaning feeding of monensin did not affect the postweaning growth of the lambs (125 vs 128 g; ADG). Postweaning growth of the lambs on veld with a creep ration was suppressed by 15% with monensin (116 vs 136 g ADG; P ≤ 0,05). For the better quality grazing (oats) the effect of monensin was not significant (144 vs 148 g ADG). Neither the protein content of the growth rations nor monensin, affected the intake (1317 ± 36 g) or the ADG (197,0 ± 12 g) of the lambs significantly.