The effectiveness of feed access time and alfalfa supplementation in finishing commercial turkeys and under natural hypobaric conditions was studied. A 2 × 2 factorial arrangement of treatments was used to assess the main effects of time of access to feed (12 and 24 h/d) and supplementation with alfalfa (0 and 1% of body weight). Additionally, the sex factor was considered to analyse the data of carcass characteristics, cardiac indices and haematological parameters. A total of 256 70-day-old Hybrid Converter turkeys were assigned to four treatments, each with four replications (8 males and 8 females in mixed-flock). All birds received the same diets for the first 70 days of age. The treatments were 12h/d-0%, 12h/d-1%, 24h/d-0% and 24h/d-1%. At 91 days of age the birds were slaughtered. No interactions or differences were observed in the main effects for feed intake, but there was a grea...