The Effect of Fattening Potential of Dalagh Lambs Fed Grazing Whole-Crop Barley

In order to study of fattening potential of lambs by pasturing barley forage, 21 Atabay (Dalagh) ram lambs, with initial body weight 22.5±0.4 selected and used in 90 days feeding experiment. A completely randomized design with 3 treatments and 7 replications was used. The lambs were fed diets include: (1) fattening diet, (2) 1 month grazing 2 month fattening deit, (3) 2 month grazing month fattening diet. The effects of treatments on total weight and daily feed intake of the lambs were not significant, however, average daily gain of lambs in the first, second and third month of the experiment had a significant difference between treatments (P>0.05). Carcass efficiency, Carcass weight, Carcass length, eye muscle area and cut fat thickness was not affected by treatments. Lambs grazed one and two month had the most leg weight respectively, that were significantly, different with the fattening diet (P>0.05). Flank and brisket weight were significantly higher in 1 month grazing treatment than others (P>0.05).