The Effect of Supplemental Enzymes in Diets Containing Two Levels of Corn Distillers' Dried Grains with solubles on Performance of Broiler Chickens

This experiment was conducted at An- najah university farm in Tulkarm to investigate the effects of different levels of dietary enzyme preparations and diets formulated to contain or not distillers dried grains with solubles on performance of broiler chicks and carcass characteristics. The experiment was 2×4 factorial arrangements with diets containing two levels of DDGS ( 0 and 10%) and four levels (0, 0.15, 0.2, 0.25 g/kg) of commercial enzyme product (Avizyme). A total number of 256 Ross 308 one day-old commercial broiler chicks were randomly assigned to eight experimental diets which replicated four times with 8 birds per replicate. Birds were given starter diets from 1to 21 days and finisher diets from 22 to 35 days. Body weight ,feed intake, feed conversion ratio and cost of feed per kg live weight were determined at weekly basis till the end of experiment. Four chicks were selected and slaughtered to determined the carcass yield and weights of cuts. The results of this study indicated that the addition of 10% DDGS without supplemental avizyme at starting period reduced (P<0.05) body weight (BW) and decreased feed conversion ratio (FCR) . This trend continued until the fourth week of age, however (FCR) were the same in all treatments in the last two weeks of age but in term of (BW) for the 35 days of experiment no significant (P<0.05) differences were detected between treatments but for (FCR) the results indicated that only two significant (P<0.05) differences were detected between treatments 0% DDGS supplemented with 200 g/ton and 10% DDGS supplemented with 0.25 g/kg which were (1.75 vs 2.08) respectively . The final cost (NIS) of kg live weight for broilers given 10% DDGS was higher (P<0.05) than broilers given 0% DDGS when no avizyme is added (3.7 vs 3.88). In terms of carcass cuts and dressing percentage, this study indicated no significant differences with respect to dressing percentage, drumstick, thigh and breast weights among treatment, but the intestine weight and fat bad %, were higher (P<0.05) for birds fed 10% DDGS compared to 0% DDGS with no supplemental avizyme ( 5 vs 3.87) and (1.5 vs 0.98) respectively. This study also indicated that liver, gizzard weights as percentages of live body weight were the same in all treatments except hearts weights which were higher (P<0.05) in diets containing 10% DDGS compared to diets containing 0% DDGS supplemented with 0, 0.2 g/kg avizyme .