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This experiment was conducted for 90d to assess the effect of feeding graded levels of concentrate allowance on rumen fermentation characteristics, performance and nutrient utilisation of weaner lambs on restricted or high concentrate allowance using 60 weaner lambs of initial average live weight of 13.90kgBW in a randomized design. The experimental treatments were 15 or 25gkg⁻¹BW or ad libitum concentrate allowance. Roughage source which contained Khejri (Prosopis cineratia) and Siris (Albizia lebback) leaves in 50:50 ratio was offered ad libitum to all the animals. Lambs supplemented with 15g or ad libitum concentrate had similar dry matter intake (4.2kg/100kgBW) but significantly (p<0.01) lower than 25g concentrate supplemented group (4.9kg/100kgBW). Organic matter and CP intakes increased with increasing concentrate supplementation. Apparent digestibilities of dry matter, organic matter, CP …