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This study investigated whether the level of pasture allowance from before conception until late pregnancy affects ewe–lamb behaviours at birth, and if those behaviours differ according to the sex of the lambs. We performed two experiments, in which 96 ewes were assigned to one of two nutritional treatments: high native pasture allowance [10–12 kg of dry matter/100 kg of body weight (BW)/day] or low pasture allowance (5–8 kg of dry matter/100 kg of BW/day). In Experiment 1, treatments began 23 days before artificial insemination and ended at 122 days of gestation (groups HPA-1, n = 38; and LPA-1, n = 25 for high and low pasture allowance, respectively), and in Experiment 2, started 40 days before artificial insemination and ended at 105 days of gestation (groups HPA-2, n = 22; and LPA-2, n = 11 for high and low pasture allowance, respectively). Thereafter, all ewes received rice bran (200 g/animal/day) and …