effect of different levels of by-pass protein on growth and carcass characteristics of male raini goats

twenty male raini goats with an average live weight of 30 ± 2.5 kg and 18 month of age. ,were used in a completely randomized design with 4 experimental diets and 5 replications to study effect of different levels by-pass(udp) protein(2.75, 4.86, 5.91 and 6.97 percent in dry matter) on growth and carcass characteristics. metabolismable energy (me) level of the all diets were similar (10.04 mj me/kg dm). the control treatment diet was offered the level of undegradable protein (2.75 % dm) which recommended by afrc (1998). the goats were weighted at fortinightly intervals during the 84 days experimental period. the average of daily live weight gain of treatment were respectivelity 68, 87.3, 99.5 and 117 g/days and feed conversion were respectvelity18.38, 13.86, 12.21 and 10.56. the result indicated that high levels by-pass protein significantly (p<0.05) increased daily live weight gain and improvement feed conversion compared with control group (udp = 2.75). but there was no such a significantly for dry matter intake in different treatment (p>0.05). after completion of this period (84 days), in each treatment 3 goats and 12 goats all together were slaughtered, the high levels by-pass protein diet had significantly increased warm and cold carcass weight compared with control diet (p < 0.05) the results indicated that growth rate and carcass gain were highest in goats fed the greater levels bypass protein (higher than advised in afrc). but it is not economically reasonable