The scarcity of feed resources with the continuously increasing cost of usual animal feeds urgently demands searching some alternate feeds for ruminants. In this study, Barberi male kids were divided into 4 groups of 5 kids (body weight 17.5 ± 1.8 kg) in each group, and ad libitum fed lentil straw (Lens culinaris; LS), LS based total mixed ration (LSTMR), urea ammoniated LS (ALS) or ALS based total mixed ration (ALSTMR) for a period of 28 days. Results showed LS was a superior feed (CP, 9.2%) for kids, but having quite high crude fibre (CF; 39.6%) and Ca:P ratio (10:1). Urea ammoniation of LS was helpful for increasing the digestible crude protein (DCP) (P < 0.01), nitrogen-free extract (NFE) and total digestible nutrients (TDN) with reduction of CF content. Urea mmoniation also improved the digestibility of neutral and acid detergent fibre (P < 0.01), but its effect on CP digestibility was negative (P < 0.05). Dry matter (DM), DCP and TDN intakes (per kg W0.75) were also improved (P < 0.01) in the kids fed ALS. Negative growth rate and nitrogen (N) balance (−33.8 and −1.4 g/day, respectively) in kids fed LS became positive (46.9 and 2.0 g/day, respectively) when ALS was used in the diets of kids. Feeding of ALS also increased (P < 0.01) the total N and ammonia N content of strained rumen liquor (SRL). Use of straw (LS or ALS) in TMR increased the digestibility of DM, organic matter and NFE (P < 0.01), intake of energy, as well as total volatile fatty acids concentration (P < 0.01) in the SRL. The present study suggested that optimum performance of kids may be achieved using either ALS alone or TMR with LS or ALS.