科研之友
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摘要
The objective of this study was to determine the effect of different levels of Distillers%26apos; Dried Grains with Solubles (DDGS) from wheat and corn on prececal Amino Acids (AA) digestibilities, growth performance and some slaughter characteristics of broilers. A total number of 240 one day-chicks (Ross 308) were randomly allotted to 3 treatments (80 birds/group), with four replicate pens per treatment and 20 birds per pen. Chicks were fed the experimental diets with DDGS at levels of 0, 6 and 12%. All chicks had free access to feed and water ad libitum during the 5-wk experiment. Average daily gain, feed intake and feed conversion efficiency were determined weekly for 35 days. The results indicated that, body weight decreased in broilers fed 12 % DDGS than the control group at the end of the experiment. No significant differences with respect to feed intake and feed conversion at the first (1-22 d) and second (22-35 d) growing periods. A significant reduction in the warm and cold carcass weight and the warm and cold dressing % at 12 % inclusion level of DDGS. Tryptophan digestibility was lower (p%26lt;0.05) with the addition of 12% levels of DDGS at d 21. At day 35 there is a significant decrease in the digestibility of total amino acids, some individual AA like threonine (9.1%) and arginine (6.38%) at 12% inclusion of DDGS in comparison with the control group. The results suggest that 12 % level of DDGS from wheat and corn reduce growth performance, carcass traits, some AA and DM digestibilities in broilers under present experimental conditions.
