Choi Janghan, Goo Doyun, Sharma Milan Kumar, Ko Hanseo, Liu Guanchen, Paneru Deependra, Choppa Venkata Sesha Reddy, Lee Jihwan, Kim Woo Kyun
Department of Poultry Science, University of Georgia, Athens, GA 30602, USA.
US National Poultry Research Center, United States Department of Agriculture Agricultural Research Service, Athens, GA 30605, USA.
Animals (Basel). 2023 Jul 7;13(13):2237. doi: 10.3390/ani13132237.
The study was conducted to investigate the effects of different inoculation doses on the growth performance, gut ecosystem, and body composition of broilers in floor pens for 35 days. A total of 750 15-day-old broilers were allocated to five experimental groups with six replicate pens. The five experimental groups included unchallenged control (CON); dose 1 (ED1): : 31,250/: 6250/: 6250; dose 2 (ED2): : 62,500/: 12,500/: 12,500; dose 3 (ED3): : 125,000/: 25,000/: 25,000; and dose 4 (ED4): : 250,000/: 50,000/: 50,000. On D 21, BW were linearly reduced by increased inoculation doses ( < 0.01). On D 35, the challenge groups had significantly lower BW compared to the CON group. Increased inoculation doses linearly decreased crude fat (CF) ( < 0.01) on D 21. Increased inoculation doses tended to increase the relative abundance of the phylum Proteobacteria ( = 0.098) on D 21. On D 35, lean:fat was linearly reduced by increased inoculation doses ( < 0.05). infection negatively influenced growth performance and gut health in broilers in the acute phase, and the negative effects were prolonged to D 35 in floor pen conditions.
本研究旨在调查不同接种剂量对地面平养肉鸡35天生长性能、肠道生态系统和体成分的影响。总共750只15日龄肉鸡被分配到五个实验组，每组六个重复栏。五个实验组包括未受挑战的对照组（CON）；剂量1（ED1）：31,250/：6250/：6250；剂量2（ED2）：62,500/：12,500/：12,500；剂量3（ED3）：125,000/：25,000/：25,000；以及剂量4（ED4）：250,000/：50,000/：50,000。在第21天，体重随着接种剂量的增加呈线性下降（P<0.01）。在第35天，与CON组相比，挑战组的体重显著降低。接种剂量增加使第21天的粗脂肪（CF）呈线性下降（P<0.01）。接种剂量增加在第21天倾向于增加变形菌门的相对丰度（P = 0.098）。在第35天，随着接种剂量的增加，瘦肉：脂肪呈线性下降（P<0.05）。感染在急性期对肉鸡的生长性能和肠道健康产生负面影响，并且在地面平养条件下，这些负面影响会持续到第35天。
