Zhang Ying, Zhu Leilei, Luo Zheng, Feng Jie
Kemin (China) Technologies Co., Ltd., Zhuhai 519040, China.
Key Laboratory of Animal Nutrition and Feed Sciences of Zhejiang Province, College of Animal Science, Zhejiang University, Hangzhou 310058, China.
Animals (Basel). 2025 Sep 20;15(18):2752. doi: 10.3390/ani15182752.
This study was conducted to investigate the interaction of dietary fat level and lysolecithin (LL) supplementation on the growth performance, nutrient digestibility, intestinal morphology, intestinal lipase activity, and lipid metabolism in yellow-feathered broilers (YFBs) during day 1-50. A total of 384 one-day-old male broilers were assigned to a 2 × 2 factorial design, including dietary fat level (Normal-fat, NF: 3% lard, day 1-21; 4.5% lard, day 22-50/Low-fat, LF: 2.4% lard, day 1-21; 3.6% lard, day 22-50) and LL supplementation (0% or 0.05%). Each treatment had six replicates with 16 birds each. The trial lasted 50 days from day 1 to day 50. During the starter phase (day 1-21), birds fed the NF diet exhibited significantly greater average daily gain (ADG) and a lower feed conversion ratio (FCR) compared to those fed the LF diet ( < 0.05). Supplementation with LL significantly improved ADG and reduced FCR throughout all phases (day 0-21, day 22-50, and day 0-50) ( < 0.05). At day 21, LL also increased the apparent metabolizable energy (AME) and the digestibility of crude protein and ether extract ( < 0.05). LL supplementation increased the villus height-to-crypt depth (VH:CD) ratio in the small intestine and elevated intestinal lipase activity during the experimental period ( < 0.05). Regarding lipid metabolism, LL supplementation decreased serum total cholesterol (TC) and the LDL:HDL ratio, while increasing liver total lipase (TL) activity at both day 21 and day 50 ( < 0.05). These findings suggest that dietary supplementation with 0.05% LL improves growth performance, enhances nutrient digestibility and intestinal absorptive capacity, and positively modulates lipid metabolism in YFBs.
本研究旨在探讨日粮脂肪水平与补充溶血卵磷脂（LL）对1至50日龄黄羽肉鸡生长性能、养分消化率、肠道形态、肠道脂肪酶活性及脂质代谢的相互作用。总共384只1日龄雄性肉鸡被分配到一个2×2析因设计中，包括日粮脂肪水平（正常脂肪，NF：1至21日龄为3%猪油，22至50日龄为4.5%猪油/低脂，LF：1至21日龄为2.4%猪油，22至50日龄为3.6%猪油）和LL补充（0%或0.05%）。每个处理有6个重复，每个重复16只鸡。试验从第1天持续到第50天，共50天。在育雏期（1至21日龄），与饲喂LF日粮的鸡相比，饲喂NF日粮的鸡平均日增重（ADG）显著更高，饲料转化率（FCR）更低（P<0.05）。在所有阶段（0至21日龄、22至50日龄和0至50日龄）补充LL均显著提高了ADG并降低了FCR（P<0.05）。在21日龄时，LL还提高了表观代谢能（AME）以及粗蛋白和乙醚提取物的消化率（P<0.05）。在试验期内，补充LL增加了小肠绒毛高度与隐窝深度（VH:CD）比值并提高了肠道脂肪酶活性（P<0.05）。关于脂质代谢，在21日龄和50日龄时，补充LL均降低了血清总胆固醇（TC）和低密度脂蛋白：高密度脂蛋白比值，同时提高了肝脏总脂肪酶（TL）活性（P<0.05）。这些结果表明，日粮中补充0.05%的LL可改善黄羽肉鸡的生长性能，提高养分消化率和肠道吸收能力，并对脂质代谢产生积极调节作用。
