Campbell J M, Russell L E, Crenshaw J D, Koehnk H J
APC Inc., Ankeny, IA.
ARKO Laboratories Ltd., Jewell, IA.
J Appl Poult Res. 2006 Dec 1;15(4):584-591. doi: 10.1093/japr/15.4.584. Epub 2019 Dec 11.
The effect of duration of feeding (continuous or discontinued after d 14) and form (granular vs. powder) of spray-dried plasma (SDP) on performance and mortality of broilers using used litter was evaluated with 240 Ross × Ross 308 male broilers (6 broilers per pen, 8 pens per treatment). Dietary treatments were control (no SDP) or SDP as powder or granular included in the pellet and fed continuously (d 0 to 35) or discontinued after d 14. During the experiment, broilers developed necrotic enteritis, and tissue cultures were positive for and , resulting in 50% mortality on control broilers. Addition of SDP to the feed improved ( < 0.05) average daily gain, feed intake, and feed efficiency for each period of the study (d 0 to 14, 15 to 28, 29 to 35, and 0 to 35). Continuous feeding of SDP improved ( < 0.05) average daily gain, feed intake, and feed efficiency from d 15 to 35 compared with broilers fed SDP to d 14. Liveability was improved ( < 0.05) in broilers consuming SDP either for 14 d or continuously throughout the experiment compared with control broilers. Spray-dried granular plasma was more effective than spray-dried powder plasma from d 0 to 14. The results of this experiment confirmed that SDP improved broiler growth rate, feed intake, feed efficiency, and minimized enteric challenge associated with necrotic enteritis with maximal protection afforded by continuous feeding. The response to SDP was independent of age of the broiler.
采用240只罗斯×罗斯308雄性肉鸡（每栏6只肉鸡，每个处理8栏），评估了喷雾干燥血浆（SDP）的饲喂持续时间（持续或在第14天后停止）和形态（颗粒状与粉末状）对使用过垫料的肉鸡生产性能和死亡率的影响。日粮处理为对照组（不添加SDP）或在颗粒料中添加粉末状或颗粒状SDP，并持续饲喂（第0至35天）或在第14天后停止。在实验期间，肉鸡发生坏死性肠炎，组织培养显示 和 呈阳性，导致对照组肉鸡死亡率达50%。在饲料中添加SDP可提高（P<0.05）本研究各阶段（第0至14天、15至28天、29至35天以及0至35天）的平均日增重、采食量和饲料效率。与饲喂SDP至第14天的肉鸡相比，持续饲喂SDP可提高（P<0.05）第15至35天的平均日增重、采食量和饲料效率。与对照肉鸡相比，在实验中采食SDP 14天或持续采食SDP的肉鸡的成活率得到提高（P<0.05）。从第0至14天，喷雾干燥颗粒血浆比喷雾干燥粉末血浆更有效。本实验结果证实，SDP可提高肉鸡生长速度、采食量、饲料效率，并将与坏死性肠炎相关的肠道挑战降至最低，持续饲喂可提供最大程度的保护。对SDP的反应与肉鸡年龄无关。
