Campbell J M, Russell L E, Crenshaw J D, Behnke K C, Clark P M
APC Inc., Ankeny, IA 50021, USA.
J Anim Sci. 2006 Sep;84(9):2501-8. doi: 10.2527/jas.2005-722.
A series of 4 experiments evaluated effects of mash conditioning temperature from a pellet mill or expander on performance of broilers fed pelleted diets containing spray-dried plasma (SDP). All experiments utilized Ross x Ross 308 male broilers randomly assigned to their respective treatments (6 or 10 broilers/pen and 8 or 10 pens/treatment). Treatments in Exp. 1 consisted of a control (0% SDP), SDP coated postpelleting, or SDP blended into the meal prepelleting. Experiment 2 and 3 included the same 3 treatments as in Exp. 1 but with additional treatments of SDP blended into the meal and conditioned at 90 or 95 degrees C before pelleting. In Exp. 4, treatments consisted of a control (0% SDP) or SDP blended into the meal and pelleted (85 degrees C conditioning temperature) or expanded (149 degrees C final effective temperature) and then pelleted. Corn-soybean meal-based diets were formulated to be equal in lysine and ME in all experiments. Pelleted diets were conditioned for 15 s at 85 degrees C, and expanded diets were conditioned at 95 degrees C, 29.7 MJ/t, 13.95 kg/cm2 cone pressure, exit temperature of 149 degrees C, and then pelleted through a 4 x 32-mm die. In Exp. 1, ADG and feed intake were improved (P < 0.05) for broilers fed SDP from d 1 to 28 of age, with greater BW at d 42. In Exp. 2, both in early (d 1 to 28 of age) phases, and overall (d 1 to 42 of age), broilers fed SDP had improved (P < 0.05) gain and efficiency. In Exp. 3, ADG, feed intake, efficiency of gain, and BW were improved (P < 0.01) for broilers fed SDP from d 1 to 21 of age, regardless of conditioning temperature. In Exp. 4, broilers fed SDP had improved (P < 0.05) gain, BW, and feed intake regardless of processing method. Overall, the results of all of the experiments demonstrated that pellet conditioning temperature from 85 to 95 degrees C and expander temperatures to 149 degrees C did not impair the positive growth effects of SDP in pelleted or expanded broiler feed.
一系列4个试验评估了制粒机或膨化机的粉料调质温度对饲喂含喷雾干燥血浆（SDP）颗粒饲料的肉鸡生产性能的影响。所有试验均使用罗斯×罗斯308雄性肉鸡，将其随机分配到各自的处理组（每栏6或10只肉鸡，每个处理8或10栏）。试验1的处理包括对照组（0% SDP）、制粒后包被SDP或在制粒前将SDP混入粉料中。试验2和3包括与试验1相同的3种处理，但增加了将SDP混入粉料并在制粒前于90或95℃调质的处理。试验4的处理包括对照组（0% SDP）或把SDP混入粉料中，制粒（调质温度85℃）或膨化（最终有效温度149℃），然后制粒。在所有试验中，基于玉米-豆粕的日粮在赖氨酸和代谢能方面配制得相同。颗粒饲料在85℃调质15秒，膨化饲料在95℃、29.7 MJ/t、13.95 kg/cm² 模头压力、出口温度149℃下调质，然后通过4×32毫米的模孔制粒。在试验1中，1至28日龄饲喂SDP的肉鸡的平均日增重（ADG）和采食量得到改善（P<0.05），42日龄时体重更大。在试验2中，无论是在早期（1至28日龄）阶段还是整个阶段（1至42日龄），饲喂SDP的肉鸡的增重和效率均得到改善（P<0.05）。在试验3中，1至21日龄饲喂SDP的肉鸡的ADG、采食量、增重效率和体重均得到改善（P<0.01），与调质温度无关。在试验4中，无论加工方法如何，饲喂SDP的肉鸡的增重、体重和采食量均得到改善（P<0.05）。总体而言，所有试验的结果表明，85至95℃的制粒调质温度和高达149℃的膨化温度不会损害SDP在颗粒或膨化肉鸡饲料中的积极生长效应。
