Effects of diet form and xylanase supplementation in high maize distillers dried grains with soluble
Source: Kim. Jin Soo, Hosseindoust, Abdolreza, Ingale. San tosh Laxman, Rathi. Piyush chandrakant, Lee, . Su Hyap , Choi Yo Han, Kim. Min Ju, Kumar. A lip, Park. Sang O, Ohh. Sang Jip, Chae. Byung Jo. 2016. Europ.Poult.Sci., 80., ISSN 1612-9199
Heat processing such as pelleting is known to improve growth performance (Serrano et all, 2012) and to reduce feed wastage (Mateos et all, 2002) in broiler feeding. Serrano et all (2012) reported that pelleting resulted in a 5.8% increase in broiler growth performance compared to broilers fed on mash. During the past decade, distillers dried grains with solubles (DDGS) have drawn the attention of feed producers as a low-cost agro-industrial alternative feed resource to conventional feed ingredients in animal production. However, inclusion of DDGS in broiler diets is documented to reduce pellet q uality (Srinivasan et al., 2009). Behnke (2007) suggested th at the amo unt of DDGS in broiler diets should not exceed 7 to 10%.
Also, Loar et al. (2010) reported that pellets containing DDGS in the amount of 30% have a significantly lower pellet quality. In general, xylanase is widely added to wheat based compound feeds for broiIers to reduce the anti-nutritional effect of non-starch polysaccharides (NSP). Results of previous studies have demonstrated that supplementation of xylanase in wheat-based (Selle et ah, 2000) and barley-based (Salobir et ah, 2000) diets can improve the energy value and the digestibility of protein, resulting in improvements in nutrient digestibility and growth performance (Choct et ah, 2004). Xylans are predominant components of NSPs of cereals used in the biofuel industry and act as anti-nutritional factors, when inevitably limiting feed utilisation (Woyengo et al., 2014).
NSPs are able to not only escape from enzymatic digestion but also encompass other nutrients in their complicate structure as well. Poultry has a digestive tract of limited capacity to utilise the NSP. The use of xylanase in maize-based diets can be beneficial (Kiarie et ah, 2014), especially when the diets contain high levels of high-NSP ingredients such as DDGS (Liu et ah, 2011). As reported (Liu et ah, 2011), the xylanase addition in maize-based diets containing DDGS significantly improved body weight gain and energy digestibility. NSPs also exist in maize, especially with a higher concentration in maize DDGS. The concentration of NSP in DDGS is 3-3.5 fold higher than that in the parent grain since the starchy endosperm of maize is used during the fermentation process (Pedersen et al., 2014).
The maximum recommended feeding level of maize DDGS in diets for broilers is less than 20% of the ration dry matter in the majority of references (Behnke, 2007). The diet in the current study was based on 20% DDGS because the enzyme supplementation shows the highest efficiency in diets with a high-NSP ingredient and on the other hand a preexperiment showed that the physical quality of the pellets decreased if the percentage of DDGS was higher than 20% (unpublished data). Little information is available on the effect of diet form and xylanase addition on growth performance and nutrient digestibility of broilers fed on a DDGS-based diet.