Agyekum A K, Woyengo T A, Slominski B A, Yin Y L, Nyachoti C M
Department of Animal Science, University of Manitoba, Winnipeg, MB, Canada.
J Anim Physiol Anim Nutr (Berl). 2014 Aug;98(4):651-8. doi: 10.1111/jpn.12112. Epub 2013 Sep 13.
Formulating swine diets containing fibrous coproducts based on net energy (NE) and standardized ileal digestible amino acid (SID AA) values is recommended for optimizing pig performance. However, the effects of applying this approach to diets with increasing dietary levels of wheat-corn-derived distillers dried grains with soluble (wcDDGS) on pig performance have not been evaluated. Thus, 48 pigs with an average body weight [BW] of 25.5 kg were used to determine the effects of increasing wcDDGS (1:1 wheat to corn ratio) content in grower diets on performance and apparent total tract digestibility (ATTD) of energy and nutrients. Pigs were housed in pens of either 2 barrows or gilts balanced for BW and fed 4 diets within sex for 42 days. Diets were a nutrient adequate corn-barley-soybean meal-based diet with 0%, 10%, 20% and 30% wcDDGS, and were similar in calculated NE and SID AA values. Acid insoluble ash was used as the indigestible marker. Final BW and overall average daily gain (ADG) linearly decreased (p < 0.05) and feed efficiency tended to decrease (p = 0.07) with increased dietary wcDDGS. Overall average daily feed intake was not affected (p > 0.10) by dietary treatment. The ATTD of dry matter and energy linearly decreased (p < 0.01), whereas the ATTD of neutral detergent fibre linearly increased (p < 0.01) with increasing dietary level of wcDDGS. Increasing dietary wcDDGS content did not affect (p > 0.10) ATTD of Ca and P. In conclusion, increasing dietary wcDDGS content reduced growth performance and ATTD of energy in growing pigs. Thus, the risks of high dietary wcDGGS content may not be completely alleviated by formulating growing pig diets on the basis of NE and SID AA systems.
为优化猪的生长性能，建议根据净能（NE）和标准回肠可消化氨基酸（SID AA）值来配制含有纤维副产品的猪日粮。然而，将这种方法应用于小麦-玉米来源的可溶性干酒糟（wcDDGS）日粮水平不断增加的日粮时，对猪生长性能的影响尚未得到评估。因此，选用48头平均体重（BW）为25.5千克的猪，以确定生长猪日粮中wcDDGS（小麦与玉米比例为1:1）含量增加对生长性能以及能量和养分的表观全肠道消化率（ATTD）的影响。猪按体重均衡地饲养在每栏2头公猪或母猪的栏中，按性别饲喂4种日粮，为期42天。日粮是以玉米-大麦-豆粕为基础的营养充足日粮，分别含有0%、10%、20%和30%的wcDDGS，且计算出的NE和SID AA值相似。酸不溶性灰分用作不可消化标记物。随着日粮中wcDDGS含量的增加，末重和总体平均日增重（ADG）呈线性下降（p<0.05），饲料效率有下降趋势（p=0.07）。日粮处理对总体平均日采食量没有影响（p>0.10）。随着日粮wcDDGS水平的增加，干物质和能量的ATTD呈线性下降（p<0.01），而中性洗涤纤维的ATTD呈线性增加（p<0.01）。日粮wcDDGS含量的增加对钙和磷的ATTD没有影响（p>0.10）。总之，增加日粮中wcDDGS的含量会降低生长猪的生长性能和能量的ATTD。因此，基于NE和SID AA系统配制生长猪日粮可能无法完全消除高日粮wcDGGS含量带来的风险。
