Effect of Diets with Different Levels of Metabolizable Energy on Physical and Chemical Carcass Characteristic of Male Kids

This research was carried out to investigate the carcass physical and chemical characteristic of fattening black male kids. The 36 black male kids (native) weaned (4 months) with 25 kg initial weight fattened in closed nutrition system. They were received different diets of 1, 2 and 3 by different levels of 2, 2.4 and 2.8 Mcal/kg DM metabolizable energy (ME) respectively and 14 per cent crud protein. At the end of experiment 6 kids of each treatment randomly were selected, slaughtered and determined carcass physical and chemical characteristics. All data were analyzed in completely random design with using the GLM procedure of Statistical Analysis System package (SAS) ver. 8.2 (SAS Institute Inc., Cary, N.C.) and Duncan’s multiple range test was used to determine differences between treatment means (P< 0.05). The result showed that the best of carcass efficiency and empty body weight were 46.5 and 91 per cent in 2.8 Mcal/kg DM of ME diets respectively (P<0.05).The highest percentage of valuable parts of carcass included shoulder, leg and longissimus lumbar (eye) muscle were 23.2, 28.5 and 20.9 per cent respectively (P<0.05). Also, the highest percentage of red meat were 74.5 and 57.1 per cent in the leg and longissimus lumbar muscle respectively (P<0.05). The maximum eye muscle area and length of eye muscle were in 2.8 Mcal/kg DM ME (P<0.05) diet. The highest percentage of carcass crud protein was 22.7 in diet 1, but the lowest was 21.4 per cent in diet 2 (P<0.05). In conclusion, the diet of 2.8 Mcal/kg DM ME and 90 days fattening period recommended because it improved carcass physical and chemical composition characteristics of black male kids.