Effects of Energy Levels and growth performance on Physical Characteristics of Iranian Lambs Meat

This study was looking for the effects of energy levels and growth performance on physical characteristics Iranian lambs’ meat. Forty-eight male lambs (initial BW 31.6kg) 5-month age were assigned to a completely randomized design with factorial method includes fattening periods (12weeks 15weeks) metabolism (ME) (2.36 2.62 ME M cal/kg DM intake). Diets iso-nitrogenous (14.1 percent crud protein DM). The rations mixed have been fed ad-libltum . weaned at 90±5 days divided randomly in two groups 12weeks 15weeks (2×24 lambs) each split (2×12). At end period, half (24 selected after 18h fasted slaughtered. After trimming skinning, all abdominal interior organs removed weighed. warm carcasses chilled 3±2ºc 24 h weighed, that their carcass cuts composition measured. All data analysed as experiment using GLM procedure SAS (2010). average final, metabolic hot weight 12 weeks 48.1, 18.2 25.5 kg 15 50.9, 19.1 27.5 (p< 0.05). Among period different had significant total mean dressing percentage between not significant. meat, bone, subcutaneous fat fat-tail 46.7, 11.7, 15.3 22.5 45.9, 16.1 23.6 respectively. But However, 2.36 Cal ME/kg positive some characteristics, because lower